Nanocomposites of nitrogen-doped graphene and cobalt tungsten oxide as efficient electrode materials for application in electrochemical devices

Nirmala Kumari; Ravindra N. Singh; Nirmala Kumari; Ravindra N. Singh

doi:10.3934/matersci.2016.4.1456

AIMS Materials Science

2016, Volume 3, Issue 4: 1456-1473. doi: 10.3934/matersci.2016.4.1456

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Nanocomposites of nitrogen-doped graphene and cobalt tungsten oxide as efficient electrode materials for application in electrochemical devices

Nirmala Kumari ,
Ravindra N. Singh ^,

Department of Chemistry, Study of Advanced centre, Institute of Science, Banaras Hindu University, Varanasi-221005, India

Received: 01 September 2016 Accepted: 20 October 2016 Published: 31 October 2016

Nitrogen-doped graphene (N-GNS), cobalt tungsten oxide (CoWO₄) and their binary composites have been synthesized and their structural and electrochemical and surface properties were investigated for application as electrode materials for oxygen reduction reaction (ORR) as well as super capacitors in 1 M KOH at 25 °C. Result shows that the composite, 40%CoWO₄/N-GNS, has greatly enhanced capacitance as well as retention capacity, compared to its constituent compounds, N-GNS and CoWO₄. The ORR activity and stability of the composite are also found to be much superior to N-GNS (or CoWO₄) under similar conditions. The 40%CoWO₄/N-GNS catalyst has also exhibited reasonably good catalytic activity for oxygen evolution reaction (OER) while that the N-GNS electrode was practically inactive.
- oxygen reduction,
- super capacitors,
- nitrogen-doped graphene,
- nanocomposites,
- oxygen evolution
Citation: Nirmala Kumari, Ravindra N. Singh. Nanocomposites of nitrogen-doped graphene and cobalt tungsten oxide as efficient electrode materials for application in electrochemical devices[J]. AIMS Materials Science, 2016, 3(4): 1456-1473. doi: 10.3934/matersci.2016.4.1456

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Abstract

Nitrogen-doped graphene (N-GNS), cobalt tungsten oxide (CoWO₄) and their binary composites have been synthesized and their structural and electrochemical and surface properties were investigated for application as electrode materials for oxygen reduction reaction (ORR) as well as super capacitors in 1 M KOH at 25 °C. Result shows that the composite, 40%CoWO₄/N-GNS, has greatly enhanced capacitance as well as retention capacity, compared to its constituent compounds, N-GNS and CoWO₄. The ORR activity and stability of the composite are also found to be much superior to N-GNS (or CoWO₄) under similar conditions. The 40%CoWO₄/N-GNS catalyst has also exhibited reasonably good catalytic activity for oxygen evolution reaction (OER) while that the N-GNS electrode was practically inactive.

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