Research article Topical Sections

Synthesis and electrocatalytic properties of La0.8Sr0.2FeO3−δ perovskite oxide for oxygen reactions

  • Received: 27 June 2017 Accepted: 03 September 2017 Published: 07 September 2017
  • Perovskites are important alternatives for precious metals as catalysts for bifunctional oxygen electrodes, involving oxygen evolution (OER) and reduction (ORR) reactions as is the case of regenerative fuel cells. In this work, strontium doped lanthanum ferrite La1−xSrxFeO3−δ (x = 0; 0.1; 0.2; 0.3; 0.4; 0.6 and 1.0) powders were prepared by a self-combustion route. The oxides, in the form of carbon paste electrodes, were characterised by cyclic voltammetry in alkaline solutions. Data analyses lead to the selection of La0.8Sr0.2FeO3−δ to prepare gas diffusion electrodes (GDEs). Cyclic voltammetry and steady state polarization curves were used, respectively, to assess the electrochemical behaviour of GDEs and to obtain kinetic data for both OER and ORR. It is concluded that the oxide preparation conditions/electrode configuration determine the electrode performance. The bifunctionality of the electrodes was assessed, under galvanostatic control, using a cycling protocol within the potential domains for OER and ORR. The potential window, i.e., the total combined overpotential between OER and ORR was found to be of ≈770 mV, value which compares well with that obtained under potentiostatic control. Even though the potential window keeps constant during 140 cycles, the increase in cycling time and/or current density (≥2.5 mA·cm−2) led to a gradual metallization of the GDE surface, as confirmed by Scanning Electron Microscopy and X-ray diffraction analysis.

    Citation: R.A. Silva, C.O. Soares, R. Afonso, M.D. Carvalho, A.C. Tavares, M.E. Melo Jorge, A. Gomes, M.I. da Silva Pereira, C.M. Rangel. Synthesis and electrocatalytic properties of La0.8Sr0.2FeO3−δ perovskite oxide for oxygen reactions[J]. AIMS Materials Science, 2017, 4(4): 991-1009. doi: 10.3934/matersci.2017.4.991

    Related Papers:

    [1] Dominique Meekers , Raseliarison Ratovonanahary , Tokinirina Andrianantoandro , Hiangotiana Randrianarisoa . Using Survey Data to Identify Opportunities to Reach Women with An Unmet Need for Family Planning: The Example of Madagascar. AIMS Public Health, 2016, 3(3): 629-643. doi: 10.3934/publichealth.2016.3.629
    [2] Waled Amen Mohammed Ahmed, Sara Boutros Shokai, Insaf Hassan Abduelkhair, Amira Yahia Boshra . Factors Affecting Utilization of Family Planning Services in a Post-Conflict Setting, South Sudan: A Qualitative Study. AIMS Public Health, 2015, 2(4): 655-666. doi: 10.3934/publichealth.2015.4.655
    [3] Sumbal Javed, Vijay Kumar Chattu . Patriarchy at the helm of gender-based violence during COVID-19. AIMS Public Health, 2021, 8(1): 32-35. doi: 10.3934/publichealth.2021003
    [4] Maryam Batool, Muhammad Farman, Aqeel Ahmad, Kottakkaran Sooppy Nisar . Mathematical study of polycystic ovarian syndrome disease including medication treatment mechanism for infertility in women. AIMS Public Health, 2024, 11(1): 19-35. doi: 10.3934/publichealth.2024002
    [5] Henry V. Doctor . Assessing Antenatal Care and Newborn Survival in Sub-Saharan Africa within the Context of Renewed Commitments to Save Newborn Lives. AIMS Public Health, 2016, 3(3): 432-447. doi: 10.3934/publichealth.2016.3.432
    [6] Peter Oyovwe, Gillian Woolhead . Exploring health care professionals' and women's perspectives on the barriers to maternal health services: a qualitative study in Eku Town of Delta State, Nigeria. AIMS Public Health, 2021, 8(1): 154-171. doi: 10.3934/publichealth.2021012
    [7] Soo-Foon Moey, Norfariha Che Mohamed, Bee-Chiu Lim . A path analytic model of health beliefs on the behavioral adoption of breast self-examination. AIMS Public Health, 2021, 8(1): 15-31. doi: 10.3934/publichealth.2021002
    [8] Soo-Foon Moey, Aaina Mardhiah Abdul Mutalib, Norfariha Che Mohamed, Nursyahirah Saidin . The relationship of socio-demographic characteristics and knowledge of breast cancer on stage of behavioral adoption of breast self-examination. AIMS Public Health, 2020, 7(3): 620-633. doi: 10.3934/publichealth.2020049
    [9] Penelope Chirambira, Sphiwe Madiba, Busisiwe Ntuli . Societal and individual drivers of fertility desires and intentions among people living with HIV: a cross sectional study of HIV clinic attendees in Soweto, South Africa. AIMS Public Health, 2022, 9(1): 173-184. doi: 10.3934/publichealth.2022013
    [10] Eduardo Fricovsky, Mudassar Iqbal Arain, Binh Tran, Phuong Thao Nguyen, Tuyet Phan, Natalie Chang . Assessing the impact of a health education outreach project on cervical cancer awareness among Vietnamese-American women in San Diego. AIMS Public Health, 2022, 9(3): 552-558. doi: 10.3934/publichealth.2022038
  • Perovskites are important alternatives for precious metals as catalysts for bifunctional oxygen electrodes, involving oxygen evolution (OER) and reduction (ORR) reactions as is the case of regenerative fuel cells. In this work, strontium doped lanthanum ferrite La1−xSrxFeO3−δ (x = 0; 0.1; 0.2; 0.3; 0.4; 0.6 and 1.0) powders were prepared by a self-combustion route. The oxides, in the form of carbon paste electrodes, were characterised by cyclic voltammetry in alkaline solutions. Data analyses lead to the selection of La0.8Sr0.2FeO3−δ to prepare gas diffusion electrodes (GDEs). Cyclic voltammetry and steady state polarization curves were used, respectively, to assess the electrochemical behaviour of GDEs and to obtain kinetic data for both OER and ORR. It is concluded that the oxide preparation conditions/electrode configuration determine the electrode performance. The bifunctionality of the electrodes was assessed, under galvanostatic control, using a cycling protocol within the potential domains for OER and ORR. The potential window, i.e., the total combined overpotential between OER and ORR was found to be of ≈770 mV, value which compares well with that obtained under potentiostatic control. Even though the potential window keeps constant during 140 cycles, the increase in cycling time and/or current density (≥2.5 mA·cm−2) led to a gradual metallization of the GDE surface, as confirmed by Scanning Electron Microscopy and X-ray diffraction analysis.


    Burnout is a common psychosocial phenomenon among health care workers. World Health Organization (WHO) defined Burn-out as an occupational phenomenon, “a syndrome conceptualized as resulting from chronic workplace stress that has not been successfully managed” [1]. It is composed of three dimensions: emotional exhaustion (EE), characterized by the sensation of physical and mental overexertion and lack of energy; (ii) depersonalization (DP) characterized by emotional detachment and negative attitudes towards patients and colleagues; and (iii) low personal accomplishment (PA), the degree to which a person perceives doing well on worthwhile tasks [2]. Burnout had negative effects on the employees, by causing different physical and mental problems and also on the organization, by decreasing the quality of care provided for patients and decreasing productivity [3]. A recent meta-analysis study that investigated burnout among nursing found a prevalence of 28% for high emotional exhaustion, 15% for high depersonalization and 31% for low personal accomplishment [4]. Burnout was associated with many sources of stress in the workplace such as work overload, long working hours, lack of resources and conflict with colleagues in addition to sociodemographic characteristics such as gender, age and years of experience. Previous studies in Saudi Arabia have been conducted among nurses in tertiary hospitals but not in the primary health care centers [5][8]. This study aimed to determine the prevalence and associated factors of burnout among nurses working in the primary health care centers in Medina city, Saudi Arabia.

    This observational analytical cross-sectional study was conducted among 200 nurses in the primary health care centers (PHC) in Medina city, Saudi Arabia. Al Madinah was divided into four regions, and three PHC centers were selected randomly from each region. All nurses in each center were approached. Those who had an experience of less than one-year were excluded.

    A self-administered questionnaire consisting of three parts was used in this study. The first part included questions on the sociodemographic characteristics. Level of education was categorized into two categories; Bachelor of Science Nursing (BSN; 4 years study and one-year internship) and Diploma in nursing (DN: three years study and 6 months internship).

    The second part assessed burnout by using the validated Maslach Burnout Inventory-Human Services Survey (MBI-HSS) which is the most commonly used tool for assessing burnout. It consists of 22 items which are divided into three subscales: emotional exhaustion, 9 items (the feelings of being emotionally overrun and exhausted by one's work); depersonalization, 5 items (the tendency to view others as objects rather than as feeling persons) and personal accomplishment, 8 items (the degree to which a person perceives doing well on worthwhile tasks). The items are answered in a 7-point scale ranging from 0 (never) to 6 (every day) [2]. The three scores are calculated for each respondent. High scores for EE and DP indicated higher levels of burnout, while high scores for PA indicated lower levels of burnout. This instrument was validated in many languages including Arabic language [9]. Cronbach's alpha coefficient for the three MBI subscales of the Arabic version were: emotional exhaustion (alpha = 0.88), depersonalization (alpha = 0.78), personal accomplishment (alpha = 0.89) [9] High level of burnout is defined in this study as high score on any of the three subscales of burnout [9],[10]. Sources of stress were assessed by 10 items which were obtained from the literature [10]. These items were headed by the following question: “to which extent dose the following conditions cause stress to you”. Each item was scored from zero (causing no stress) to 4 (causing severe stress) [10].

    Ethical approval was obtained from the Ethics Committee of the Directorate of Health in Al-Madinah. Objectives and benefits of the study were explained to the participants. Participants confidentiality and anonymity were assured. Signed consents were obtained from the participants.

    Analysis was performed using Statistical Package for the Social Sciences (SPSS®) (version 22.0, IBM, Armonk, NY). The 22 items of MBI were summed to obtain the total score of each subscale [2].

    Each subscale was categorized into low, moderate and high according to the recommended cut-off points [9]. Test of normality was performed for each subscale. T-test and analysis of variance (ANOVA) test were used to assess the association between burnout subscales and the sociodemographic variables. Pearson Correlation coefficient was used to assess the association between burnout subscales and the sources of stress. To obtain the significant factors associated with each subscale of burnout, multiple linear regression analysis was employed by using “Backward” technique. Multi-collinearity was checked between the independent variables by using the VIF. The accepted level of significance was below 0.05 (p < 0.05).

    Most participants were females (73.0%), aged ≤35 years (52.0%), married (81.0%) and had >10 years of service. Most of them had no administrative work (80.0%), had diploma (75.0%) and had a monthly income of less than 12 thousand Saudi Rial (SAR) (53.0%) (Table 1).

    Table 1.  Socio-demographic characteristics of the participants.
    n %
    Age
     ≤35 104 52.0
     >35 96 48.0
    Gender
     Male 54 27.0
     Female 146 73.0
    Marital status
     Single 30 15.0
     Married 162 81.0
     Divorced/widower 8 4.0
    Educational level
     Diploma 150 75.0
     Bachelor 50 25.0
    Years of service
     5 or less 32 16.0
     6–10 57 28.5
     >10 111 55.5
    Administrative task
     Yes 40 20.0
     No 160 80.0
    Monthly income (SAR)*
     <12000 106 53.0
     ≥12000 94 47.0

    Note: *1 USD = 3.7 SAR.

     | Show Table
    DownLoad: CSV

    About 39% had high EE, 38% had high DP and 85.5% had low PA. Forty-five participants (22.5%) scored high on all the three subscale of burnout and 178 scored high at least on one subscale of burnout (89%) (Table 2). The reliability analysis of the three subscales yielded Cronbach alpha of 0.84 for EE, 0.76 for DP and 0.85 for PA.

    Table 2.  Prevalence of burnout among participants.
    Low n (%) Moderate n (%) High n (%)
    EE 72 (36) 50 (25) 78 (39)
    DP 46 (23) 78 (39) 76 (38)
    PA 171 (85.5) 11 (5.5) 18 (9.0)

     | Show Table
    DownLoad: CSV

    The most important sources of stress were long working hours, work overload, fear of violence and lack of resources (Table 3).

    Table 3.  Sources of stress in the workplace ranked by mean.
    Item Mean
    Long working hours 3.161
    Work overload 2.779
    Fear of violence 2.623
    Lack of resources 2.588
    Work demands affect my personal homelife 2.362
    Fear of making mistake that can lead to serious consequences 2.302
    Working with uncooperative colleagues 2.302
    Poor work environment 2.281
    Office work 1.985
    Cannot participate in decision-making 1.995

     | Show Table
    DownLoad: CSV
    Table 4.  Relationship between burnout and socio-demographic characteristics.
    Variables Nurses' burnout
    EE
    DP
    PA
    Mean (SD) P value Mean (SD) P value Mean (SD) P value
    Age
     ≤35 21.4 (11.5) 8.9 (5.0) 21.2(5.8)
     >35 24.9 (13.5) 0.041 9.6 (6.4) 0.348 16.1(5.5) 0.002
    Gender
     Male 23.4 (13.4) 9.2 (5.2) 17.9 (6.2)
     Female 22.9 (12.2) 0.807 9.3 (5.1) 0.855 19.0 (5.0) 0.502
    Marital status
     Single 22.2 (13.1) 8.9 (5.2) 20.0(5.4)
     Married 23.2 (12.5) 9.3 (5.7) 18.3(5.1)
     Divorced/widower 22.6 (13.8) 0.910 9.3 (7.2) 0.926 17.7(6.2) 0.794
    Educational level
     Diploma 21.2 (12.8) 9.2 (5.8) 20.8 (5.4)
     University 28.4 (10.3) <0.001 9.4 (5.5) 0.800 14.2 (7.2) 0.001
    Years of service
     5 or less 22.8 (12.1) 8.3 (4.5) 22.8 (4.2)
     6–10 21.9 (11.3) 9.4 (5.3) 19.4 (6.4)
     >10 23.7 (13.3) 0.658 9.4 (6.2) 0.627 17.3 (5.7) 0.060
    Administrative task
     Yes 22.4 (11.2) 8.7 (5.4) 23.2 (6.5)
     No 23.2 (12.9) 0.727 9.4 (5.8) 0.464 17.7 (7.4) 0.021
    Monthly income (SAR)
     <12000 24.6 (11.8) 10.5 (5.5) 26.3 (6.4)
     ≥12000 22.0 (12.9) 0.138 8.4 (5.7) 0.014 25.5 (5.6) 0.921

     | Show Table
    DownLoad: CSV

    In univariate analysis, emotional exhaustion score was significantly higher among those aged >35 years (24.9 ± 13.5) compared to those aged ≤35 years (21.4 ± 11.5), (p = 0.041), and among those who had Bachelor degree (28.4 ± 10.3) compared to those who had diploma (21.2 ± 12.8), (p < 0.001) (Table 4).

    EE was correlated positively and significantly with all the ten sources of stress (r coefficient ranged from 0.379 to 0.586), (p < 0.001) (Table 5). DP was higher among those who had an income of <12000 SAR (10.5 ± 5.5) compared to those with income of ≥12000 (8.4 ± 3.7), (p = 0.014) (Table 4). DP was correlated positively and significantly with all the ten sources of stress (r coefficient ranged from 0.198 to 0.368), (p < 0.005) (Table 5). PA was significantly lower among those who aged >35 years (16.1 ± 5.5) compared to those aged ≤35 years (21.2 ± 5.8), (p = 0.002), among those who had university degree (14.2 ± 7.2) compared to those who had diploma (20.8 ± 5.4), (p = 0.001) and among those who had not administrative task (17.7 ± 7.4) compared to those who had (23.2 ± 6.5), (p = 0.021) (Table 4).

    Table 5.  Relationship between burnout and sources of stress in the workplace.
    Item EE
    DP
    PA
    Coefficient P value Coefficient P value Coefficient P value
    Work overload 0.495 <0.001 0.204 0.004 −0.106 0.135
    Long working hours 0.379 <0.001 0.198 0.005 −0.007. 0.926
    Fear of violence 0.422 <0.001 0.216 0.002 −0.100 0.161
    Poor work environment 0.586 <0.001 0.368 <0.001 −0.219 0.002
    Lack of resources 0.511 <0.001 0.301 <0.001 −0.086 0.228
    Fear of making mistake that can lead to serious consequences 0.428 <0.001 0.220 <0.001 −0.097 0.174
    Working with uncooperative colleagues 0.362 <0.001 0.197 0.005 −0.064 0.365
    Office work 0.340 <0.001 0.273 <0.001 −0.055 0.436
    Cannot participate in decision-making 0.424 <0.001 0.329 <0.001 −0.028 0.697
    Work demands affect my personal home life 0.525 <0.001 0.249 <0.001 −0.0091 0.200

     | Show Table
    DownLoad: CSV

    In multivariate analysis, significant predictors of EE were work overload (p = 0.010), poor work environment (p < 0.001), lack of resources (p = 0.033), working with uncooperative colleagues (p = 0.005), work demands affect personal homelife (p < 0.001) and having university education (p < 0.001) (Table 6). Significant predictors of DP were poor work environment (p < 0.001), “cannot participate in decision-making” (p = 0.041) and low income (<12000 SAR) (Table 6). Low personal accomplishment was significantly predicted by age (>35 years) (p=0.001), educational level (university), (p = 0.004) and no administrative task (p = 0.003) (Table 6).

    Table 6.  Factors associated with burnout in multivariate analysis.
    B SE Beta P value VIF
    Emotional exhaustion
    Work overload 1.636 0.63 0.170 0.010 1.688
    Poor work environment 3.134 0.68 0.318 <0.001 1.887
    Lack of resources 1.473 0.68 0.148 0.033 1.853
    Fear of making mistake that can lead to serious consequences 1.038 0.59 0.110 0.082 1.565
    Working with uncooperative colleagues 1.875 0.65 −0.199 0.005 1.907
    Work demands affect my personal home life 2.226 0.56 0.267 <0.001 1.774
    University (reference = diploma) 6.009 1.51 0.206 <0.001 1.052
    Depersonalization
    Poor work environment 1.246 0.35 0.278 <0.001 1.246
    Cannot participate in decision-making 0.702 0.35 0.156 0.041 0.702
    Monthly income less than 12K SAR −1.776 0.76 −0.0152 0.021 −1.776
    Personal accomplishment
    Age (>35) −5.550 1.59 −0.0234 0.001 1.009
    Educational level (Bachelor) −5.354 1.82 −0.0196 0.004 1.001
    No administrative task −5.960 1.98 −0.0201 0.003 1.010

     | Show Table
    DownLoad: CSV

    The primary aim of this study was to estimate the prevalence of burnout and its associated factors among nurses in the primary health care setting. This study found 89% of the participants scored high at least on one subscale of burnout. Low personal accomplishment was found among 89% of nurses while high EE and high DP were reported by 39%, and 38% respectively. Moderate level of burnout was found among 25% (EE), 39% (DP) and 5.5% (PA). The overall prevalence of burnout in this study was 89%.

    Previous studies among nurses in Saudi Arabia found that 32 % to 71.6% of nurses had high levels of burnout [5][8]. It was found by Al-Turki et al. that 45% of nurses had high EE, 42% had high depersonalization and 71.5% had low personal accomplishment. [5] Another study from Saudi Arabia found that 71.6 % of nurses had high level of burnout. [7] Another study from Saudi Arabia reported that 42% of nurses had moderate level of stress. [8] However, these two previous studies did not define the cut-off point for burnout. All the other mentioned studies used Maslach burnout inventory.

    A recent study from Egypt found that 54.6% of nurses had average levels of emotional exhaustion, 48% scored high on depersonalization, and 77.5% had low personal accomplishment [11]. Another study from Egypt found that 52.8% of nurses experienced high EE, 7.2% had high level of DP and 96.5% had low PA [12]. A study among Iranian nurses found that 25% of the participants had high level of burnout. [13] A study of nurses in Israel reported that 30.8% reported high emotional exhaustion, 5.1% had high depersonalization, and 84.6% had low personal accomplishment [14]. In Jordan 55% of nurses reported high level of emotional exhaustion, 50% reported high level of depersonalization, and 50% reported low personal accomplishment [15]. A recent international meta-analysis study that investigated burnout among nurses found that 28% of nurses had high level emotional exhaustion, 15% had high level of depersonalization and 31% had low personal accomplishment [4]. Regarding factors associated with burnout, this study found that high emotional exhaustion was associated with age group, level of education, and with sources of stress in the work place such as work overload, lack of resources, uncooperative colleagues, and poor working environment. DP was associated with low income, poor working environment and inability to participate in decision-making. Low PA was associated with age group, level of education and no engagement in administrative work.

    While some studies had not found association between burnout and socio-demographic factors, [8] some other studies had found a significant association between burnout and age, marital status and education level [5],[7]. However, there is a great agreement between studies that burnout is associated with stress and sources of stress in the workplace [15][20].

    That sources of stress in the workplace included role conflict, work overload, conflict with colleagues, long working hours, poor working environment and low supervisor support. A previous meta-analysis study found that job insecurity, low job control, low reward, high demands and high work load increased the risk for developing burnout [21].

    Long-term exposure to stressors was found to affect the professional quality of life, leading to cognitive and emotional distress and burnout [22]. Continuous effort in stressful, demanding tasks can have physiological and psychological impacts, such as increased heart rate and prolonged stimulation of the sympathetic nervous system. This is well recognized to be associated with exhaustion, particularly when the workload is high. Long working hours was found to be associated with emotional exhaustion because it produces excessive demands and disrupt family life and ability to trail outside interests [15][17].

    This finding emphasis that any effort to manage burnout should be directed toward the management of sources of stress in the work place. Burnout was also found to be affected by other factors rather than work related factors and stressors in the work place. It was found in the previous studies that Alexithymic personality trait increased likelihood to experience burnout and has a negative effect on the professional quality of life among. radiation oncologists [23],[24]. In addition, emotional intelligence was found to be linked with all the three parts of burnout [25]. Emotional intelligence is defined as the ability to perceive emotion, integrate emotion to facilitate thought, understand emotions, and regulate emotions to promote personal growth [26].

    This study found that 89% of the participants scored high at least on one subscale of burnout. Burnout was associated mainly with work related sources of stress. A comprehensive interventional approach is needed to minimize and prevent burnout among nurses in the primary health care centers. There were three types of interventions to manage burnout: individual-focused, organizational, and combine interventions. Individual-focused interventions included self-care workshops, stress management skills, communication skills training, yoga, mindfulness, meditation and coping programs. Organizational interventions aimed mainly to reduces stress and to mitigate the impact of stressors in the workplace; they included workload or schedule-rotation, stress management training program, access to peer mentoring, help and guidance from experienced work colleagues and teamwork/transitions. Individual and organizational interventions should be combined to effectively reduce burnout among healthcare providers. It would be also of great interest if future studies investigate which personality factors are associated with burnout in nursing working in primary health care centers. This will help to prioritize intervention to focus on nurses with high risk personality trait. Interventions to improve emotional intelligence are also recommended. Poulsen & Poulsen (2018) proposed a Self-Determination Theory and they suggested two steps to prevent burnout during early career. The first step was to educate trainers and trainees about times when individuals may be vulnerable to work stress. Learning how to recognize the warning signs of burnout and being aware of vulnerability is a vital first step. Education about the need for self-awareness and importance of self-care would occur in the early stages of training. The next step involved alerting practitioners regarding the extent and accessibility of information regarding evidence-based strategies that can be employed to address exhaustion and prevent disengagement [27].

    [1] Lee J, Jeonga B, Ocona JD (2013) Oxygen electrocatalysis in chemical energy conversion and storage technologies. Curr Appl Phys 13: 309–321. doi: 10.1016/j.cap.2012.08.008
    [2] Jorissen L (2006) Bifunctional oxygen/air electrodes. J Power Sources 155: 23–32. doi: 10.1016/j.jpowsour.2005.07.038
    [3] Kong FD, Zhang S, Yin GP, et al. (2012) Preparation of Pt/Irx(IrO2)10−x bifunctional oxygen catalyst for unitized regenerative fuel cell. J Power Sources 210: 321–326.
    [4] Jung HY, Park S, Popov BN (2009) Electrochemical studies of an unsupported PtIr electrocatalyst as a bifunctional oxygen electrode in a unitized regenerative fuel cell. J Power Sources 191: 357–361.
    [5] Wang B (2005) Recent development of non-platinum catalysts for oxygen reduction reaction. J Power Sources 152: 1–15. doi: 10.1016/j.jpowsour.2005.05.098
    [6] Pettersson J, Ramsey B, Harrison D (2006) A review of the latest developments in electrodes for unitised regenerative polymer electrolyte fuel cells. J Power Sources 157: 28–34. doi: 10.1016/j.jpowsour.2006.01.059
    [7] Park S, Shao YY, Liu J, et al. (2012) Oxygen electrocatalysts for water electrolyzers and reversible fuel cells: status and perspective. Energ Environ Sci 5: 9331–9344. doi: 10.1039/c2ee22554a
    [8] Cheng FY, Chen J (2012) Metal–air batteries: from oxygen reduction electrochemistry to cathode catalysts. Chem Soc Rev 41: 2172–2192. doi: 10.1039/c1cs15228a
    [9] Chen ZW, Higgins D, Yu AP, et al. (2011) A review on non-precious metal electrocatalysts for PEM fuel cells. Energ Environ Sci 4: 3167–3192. doi: 10.1039/c0ee00558d
    [10] Shao YY, Park S, Xiao J, et al. (2012) Electrocatalysts for nonaqueous lithium–air batteries: status, challenges, and perspective. ACS Catal 2: 844–857. doi: 10.1021/cs300036v
    [11] Othman R, Dicks AL, Zhu ZH (2012) Non precious metal catalysts for the PEM fuel cell cathode. Int J Hydrogen Energ 37: 357–372. doi: 10.1016/j.ijhydene.2011.08.095
    [12] Prakash J, Tryk D, Yeager E (1990) Electrocatalysis for oxygen electrodes in fuel cells and water electrolyzers for space applications. J Power Sources 29: 413–422. doi: 10.1016/0378-7753(90)85014-4
    [13] Rios E, Gautier JL, Poillerat G, et al. (1998) Mixed valency spinel oxides of transition metals and electrocatalysis: case of the MnxCo3−xO4 system. Electrochim Acta 44: 1491–1497. doi: 10.1016/S0013-4686(98)00272-2
    [14] Nikolova V, Iliev P, Petrov K, et al. (2008) Electrocatalysts for bifunctional oxygen/air electrodes. J Power Sources 185: 727–733. doi: 10.1016/j.jpowsour.2008.08.031
    [15] Chang YM, Wu PW, Wu CY, et al. (2009) Synthesis of La0.6Ca0.4Co0.8IrO3 perovskite for bi-functional catalysis in an alkaline electrolyte. J Power Sources 189: 1003–1007.
    [16] Tulloch J, Donne SW (2009) Activity of perovskite La1−xSrxMnO3 catalysts towards oxygen reduction in alkaline electrolytes. J Power Sources 188: 359–366. doi: 10.1016/j.jpowsour.2008.12.024
    [17] Zhuang S, Huang K, Huang C, et al. (2011) Preparation of silver-modified La0.6Ca0.4CoO3 binary electrocatalyst for bi-functional air electrodes in alkaline medium. J Power Sources 196: 4019–4025.
    [18] Wu X, Scott K (2012) A non-precious metal bifunctional oxygen electrode for alkaline anion exchange membrane cells. J Power Sources 206: 14–19. doi: 10.1016/j.jpowsour.2011.12.052
    [19] Jin C, Cao X, Zhang L, et al. (2013) Preparation and electrochemical properties of urchin-like La0.8Sr0.2MnO3 perovskite oxide as bifunctional catalyst for oxygen reduction and oxygen evolution reaction. J Power Sources 241: 225–230.
    [20] Meadowcroft DB (1970) Low-cost oxygen electrode material. Nature 226: 847–848. doi: 10.1038/226847a0
    [21] Tejuca LG, Fierro JLG, Tascon JMD (1989) Structure and reactivity of perovskite-type oxides. Adv Catal 36: 237–328.
    [22] Boivin JC, Mairesse G (1998) Recent material developments in fast oxide ion conductors. Chem Mater 10: 2870–2888. doi: 10.1021/cm980236q
    [23] White JH, Sammells AF (1993) Perovskite anode electrocatalysis for direct methanol fuel cells. J Electrochem Soc 140: 2167–2177. doi: 10.1149/1.2220791
    [24] Yu HC, Fung KZ, Guo TC, et al. (2004) Syntheses of perovskite oxides nanoparticles La1−xSrxMO3−δ (M = Co and Cu) as anode electrocatalyst for direct methanol fuel cell. Electrochim Acta 50: 811–816. doi: 10.1016/j.electacta.2004.01.121
    [25] Velraj S, Zhu JH (2013) Sm0.5Sr0.5CoO3−δ—A new bi-functional catalyst for rechargeable metal-air battery applications. J Power Sources 227: 48–52.
    [26] Wang L, Ara M, Wadumesthrige K, et al. (2013) Graphene nanosheet supported bifunctional catalyst for high cycle life Li-air batteries. J Power Sources 234: 8–15. doi: 10.1016/j.jpowsour.2013.01.037
    [27] Noroozifar M, Khorasani-Motlagh M, Ekrami-Kakhki MS, et al. (2014) Enhanced electrocatalytic properties of Pt–chitosan nanocomposite for direct methanol fuel cell by LaFeO3 and carbon nanotube. J Power Sources 248: 130–139. doi: 10.1016/j.jpowsour.2013.09.091
    [28] Peňa MA, Fierro JLG (2001) Chemical structures and performance of perovskite oxides. Chem Rev 101: 1981–2018. doi: 10.1021/cr980129f
    [29] Armstrong NH, Duncana KL, Wachsman ED (2013) Effect of A and B-site cations on surface exchange coefficient for ABO3 perovskite materials. Phys Chem Chem Phys 15: 2298–2308. doi: 10.1039/c2cp42919e
    [30] Marti PE (1994) Influence of the A-site cation in AMnO3+x and AFeO3+x (A = La, Pr, Nd and Gd) perovskite-type oxides on the catalytic activity for methane combustion. Catal Lett 26: 71–84. doi: 10.1007/BF00824033
    [31] Swette L, Kackley N, McCatty SA (1991) Oxygen electrodes for rechargeable alkaline fuel cells. III. J Power Sources 36: 323–339. doi: 10.1016/0378-7753(91)87010-9
    [32] Kannan AM, Shukla AK, Sathyanarayana SJ (1989) Oxide-based bifunctional oxygen electrode for rechargeable metal/air batteries. J Power Sources 25: 141–150. doi: 10.1016/0378-7753(89)85006-2
    [33] Kannan AM, Shukla AK (1990) Rechargeable iron/air cells employing bifunctional oxygen electrodes of oxide pyrochlores. J Power Sources 35: 113–121.
    [34] Swette L, Kackley N (1990) Oxygen electrodes for rechargeable alkaline fuel cells – II. J Power Sources 29: 423–436. doi: 10.1016/0378-7753(90)85015-5
    [35] Soares CO, Carvalho MD, Jorge MEM, et al. (2012) High Surface area LaNiO3 electrodes for oxygen electrocatalysis in alkaline media. J Appl Electrochem 42: 325–332.
    [36] Soares CO, Silva RA, Carvalho MD, et al. (2013) Oxide loading effect on the electrochemical performance of LaNiO3 coatings in alkaline media. Electrochim Acta 89: 106–113. doi: 10.1016/j.electacta.2012.11.040
    [37] Silva RA, Soares CO, Carvalho MD, et al. (2014) Stability of LaNiO3 gas diffusion oxygen electrodes. J Solid State Electr 18: 821–831.
    [38] Neburchilov V, Wang H, Martin JJ, et al. (2010) A review on air cathodes for zinc–air fuel cells. J Power Sources 195: 1271–1291. doi: 10.1016/j.jpowsour.2009.08.100
    [39] Manoharan R, Shukla AK (1985) Oxide supported carbon/air electrodes for alkaline solutions power devices. Electrochim Acta 30: 205–209. doi: 10.1016/0013-4686(85)80083-9
    [40] Karlsson G (1985) Perovskite catalysts for air electrodes. Electrochim Acta 30: 1555–1561. doi: 10.1016/0013-4686(85)80019-0
    [41] Wang W, Huang Y, Jung S, et al. (2006) A Comparison of LSM, LSF, and LSCo for solid oxide electrolyzer anodes. J Electrochem Soc 153: A2066–A2070. doi: 10.1149/1.2345583
    [42] Patrakeev MV, Bahteeva JA, Mitberg EB, et al. (2003) Electron/hole and ion transport in La1−xSrxFeO3−δ. J Solid State Chem 172: 219–231.
    [43] Tsipis EV, Kharton VV (2008) Electrode materials and reaction mechanisms in solid oxide fuel cells: a brief review. II. Electrochemical behavior vs. materials science aspects. J Solid State Electr 12: 1367–1391.
    [44] Sun C, Hui R, Roller J (2010) Cathode materials for solid oxide fuel cells a review. J Solid State Electr 14: 1125–1144. doi: 10.1007/s10008-009-0932-0
    [45] Anderson MD, Stevenson JM, Simner SP (2004) Reactivity of lanthanide ferrite SOFC cathodes with YSZ electrolyte. J Power Sources 129: 188–192. doi: 10.1016/j.jpowsour.2003.11.039
    [46] Kinoshita K (1992) Electrochemical Oxygen Technology, New York: John Wiley and Sons.
    [47] Wang J, Zhang Y, Guo W, et al. (2013) Electrochemical behavior of La0.8Sr0.2FeO3 electrode with different porosities under cathodic and anodic polarization. Ceram Int 39: 5263–5270.
    [48] Bronoel G, Grenier JC, Reby J (1980) Comparative behavior of various oxides in the various electrochemical reactions of oxygen evolution and reduction in alkaline medium. Electrochim Acta 25: 1015–1018. doi: 10.1016/0013-4686(80)87007-1
    [49] Bockris JOM, Otagawa T (1984) The electrocatalysis of oxygen evolution on perovskites. J Electrochem Soc 131: 290–302.
    [50] Wattiaux A, Grenier JC, Pouchard M, et al. (1987) Electrolytic oxygen evolution in alkaline medium of La1−xSrxFeO3−y perovskite/related ferrites I. Electrochemical study. J Electrochem Soc 134: 1714–1724.
    [51] Suresh K, Panchapagesan TS, Patil KC (1999) Synthesis and properties of La1−xSrxFeO3. Solid State Ionics 126: 299–305. doi: 10.1016/S0167-2738(99)00248-9
    [52] Moçoteguy P, Brisse A (2013) A review and comprehensive analysis of degradation mechanisms of solid oxide electrolysis cells. Int J Hydrogen Energ 38: 1587–15902.
    [53] Ramos T, Carvalho MD, Ferreira LP, et al. (2006) Structural and magnetic characterization of the series La1−xSrxFeO3. Chem Mater 18: 3860–3865. doi: 10.1021/cm060689s
    [54] Zafar A, Imran Z, Rafiq MA, et al. (2011) Evidence of Pool-Frenkel conduction mechanism in Sr-doped lanthanum ferrite La1−xSrxFeO3 (0 ≤ x ≤ 1) system. 2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC).
    [55] Dann SE, Currie DB, Weller MT, et al. (1994) The effect of oxygen stoichiometry on phase relations and structure in the system La1−xSrxFeO3−δ (0 ≤ x ≤ 1, 0 ≤ δ ≤ 0.5). J Solid State Chem 109: 134–144. doi: 10.1006/jssc.1994.1083
    [56] Li XX, Qu W, Zhang JJ, et al. (2011) Electrocatalytic activities of La0.6Ca0.4CoO3 and La0.6Ca0.4CoO3-carbon composites toward the oxygen reduction reaction in concentrated alkaline electrolytes. J Electrochem Soc 158: A597–A604.
    [57] Staud N, Ross PN (1986) The corrosion of carbon black anodes in alkaline electrolyte II. Acetylene black and the effect of oxygen evolution catalysts on corrosion. J Electrochem Soc 133: 1079–1084.
    [58] Augustin CO, Selvan RK, Nagaraj R, et al. (2005) Effect of La3+ substitution on the structural, electrical and electrochemical properties of strontium ferrite by citrate combustion method. Mater Chem Phys 89: 406–411. doi: 10.1016/j.matchemphys.2004.09.028
    [59] Trasatti S, Petrii O (1991) Real surface area measurements in electrochemistry. Pure Appl Chem 63: 711–734.
    [60] Miyahara Y, Miyazaki K, Fukutsuka T, et al. (2014) Catalytic roles of perovskite oxides in electrochemical oxygen reactions in alkaline media. J Electrochem Soc 161: F694–F697. doi: 10.1149/2.019406jes
    [61] Mohamed R, Cheng X, Fabbri E, et al. (2015) Electrocatalysis of perovskites: The influence of carbon on the oxygen evolution activity. J Electrochem Soc 162: F579–F586. doi: 10.1149/2.0861506jes
    [62] Poux T, Napolsky FS, Dintzer T, et al. (2012) Dual role of carbon in the catalytic layers of perovskite/carbon composites for the electrocatalytic oxygen reduction reaction. Catal Today 189: 83–92. doi: 10.1016/j.cattod.2012.04.046
    [63] Nishio K, Molla S, Okugaki T, et al. (2015) Effects of carbon on oxygen reduction and evolution reactions of gas-diffusion air electrodes based on perovskite-type oxides. J Power Sources 298: 236–240. doi: 10.1016/j.jpowsour.2015.08.070
    [64] Matsumoto Y, Yoneyama H, Tamura H (1977) Catalytic activity for electrochemical reduction of oxygen of lanthanum nickel-oxide and related oxides. J Electroanal Chem 79: 319–326. doi: 10.1016/S0022-0728(77)80453-1
    [65] Parthasarathy A, Martin CR, Srinivasan S (1991) Investigations of the oxygen reduction reaction at the platinum nafion interface using a solid state electrochemical cell. J Electrochem Soc 138: 916–921. doi: 10.1149/1.2085747
    [66] Alegre C, Modica E, Aricò AS, et al. (2017) Bifunctional oxygen electrode based on a perovskite/carbon composite for electrochemical devices. J Electroanal Chem [In Press].
    [67] Wang J, Zhao H, Gao Y, et al. (2016) Ba0.5Sr0.5Co0.8Fe0.2O3−δ on N-doped mesoporous carbon derived from organic waste as a bi-functional oxygen catalyst. Int J Hydrogen Energ 41: 10744–10754.
    [68] Zhu Y, Zhou W, Yu J, et al. (2016) Enhancing electrocatalytic activity of perovskite oxides by tunning cation deficiency for oxygen reduction and evolution reactions. Chem Mater 28: 1691–1697. doi: 10.1021/acs.chemmater.5b04457
    [69] Alegre C, Modica E, Rodlert-Bacilieri M, et al. (2017) Enhanced durability of a cost-effective perovskite-carbon catalyst for the oxygen evolution and reduction reactions in alkaline environment. Int J Hydrogen Energ [In Press].
    [70] Li X, Pletcher D, Russell AE, et al. (2013) A novel bifunctional oxygen GDE for alkaline secondary batteries. Electrochem Commun 34: 228–230. doi: 10.1016/j.elecom.2013.06.020
    [71] Gorlin Y, Jaramillo TF (2010) A bifunctional nonprecious metal catalyst for oxygen reduction and water oxidation. J Am Chem Soc 132: 13612–13614. doi: 10.1021/ja104587v
    [72] Yuasa M, Yamazoe N, Shimanoe K (2011) Durability of carbon-supported La–Mn perovskite-base type of oxide for oxygen reduction catalysts in strong alkaline solutions. J Electrochem Soc 158: A411–A416. doi: 10.1149/1.3551499
    [73] Pourbaix M (1974) Atlas of electrochemical equilibria in aqueous solution, Houston, Tex, United States: National Association of Corrosion Engineers.
    [74] Karlson L, Lindström H (1986) Catalyst for oxygen evolution in bifunctional air-cathodes. J Mol Catal 38: 41–48. doi: 10.1016/0304-5102(86)87047-X
  • This article has been cited by:

    1. Zin Wai Htay, Junko Kiriya, Jennifer Lisa Sakamoto, Masamine Jimba, Association Between Women’s Empowerment and Unmet Family Planning Needs in Low- and Middle-Income Countries in Southeast Asia: A Cross-Sectional Study, 2023, 2329-3691, 1, 10.1080/23293691.2023.2174822
    2. Christopher Hogan, Gouranga Lal Dasvarma, Udoy Saikia, Explaining the role of proximate and indirect determinants on fertility decline in Timor-Leste, 2024, 1744-1730, 1, 10.1080/17441730.2024.2436210
    3. Paola Borquez-Arce, Chiara E. Sumich, Raimundo da Costa, Gabriela Guizzo-Dri, Phoebe R. Spencer, Katherine Sanders, Debra S. Judge, Women’s Life Trajectories in Rural Timor-Leste: A Life History and Life Course Perspective on Reproduction and Empowerment, 2025, 14, 2076-0760, 203, 10.3390/socsci14040203
  • Reader Comments
  • © 2017 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0)
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Metrics

Article views(6798) PDF downloads(1199) Cited by(7)

Figures and Tables

Figures(10)

/

DownLoad:  Full-Size Img  PowerPoint
Return
Return

Catalog