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Effect of the anionic counterpart: Molybdate vs. tungstate in energy storage for pseudo-capacitor applications

Sharma, P., Minakshi, M.ORCID: 0000-0001-6558-8317, Whale, J.ORCID: 0000-0002-3130-5267, Jean-Fulcrand, A. and Garnweitner, G. (2021) Effect of the anionic counterpart: Molybdate vs. tungstate in energy storage for pseudo-capacitor applications. Nanomaterials, 11 (3). Article 580.

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Abstract

Nickel-based bimetallic oxides (BMOs) have shown significant potential in battery-type electrodes for pseudo-capacitors given their ability to facilitate redox reactions. In this work, two bimetallic oxides, NiMoO4 and NiWO4, were synthesized using a wet chemical route. The structure and electrochemical properties of the pseudo-capacitor cathode materials were characterized. NiMoO4 showed superior charge storage performance in comparison to NiWO4, exhibiting a discharge capacitance of 124 and 77 F·g−1, respectively. NiMoO4, moreover, demonstrates better capacity retention after 1000 cycles with 87.14% compared to 82.22% for NiWO4. The lower electrochemical performance of the latter was identified to result from the redox behavior during cycling. NiWO4 reacts in the alkaline solution and forms a passivation layer composed of WO3 on the electrode, while in contrast, the redox behavior of NiMoO4 is fully reversible.

Item Type: Journal Article
Murdoch Affiliation(s): Engineering and Energy
Publisher: MDPI
Copyright: © 2021 by the authors
URI: http://researchrepository.murdoch.edu.au/id/eprint/60139
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