Journal
SUSTAINABLE MATERIALS AND TECHNOLOGIES
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.susmat.2022.e00451
Keywords
Molybdenum carbide; Tungsten carbide; Vanadium carbide; CNT-graphene hybrid; Electrocatalysis; Total water splitting
Categories
Funding
- Ministry of Human Resource Development (MHRD)
- Department of Science and Technology (DST), India [EMR/2016/005843, SR/FST/PSII-009/2010]
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Transition metal carbides have attracted considerable attention as a non-precious electrocatalyst for efficient hydrogen evolution reaction. In this study, a bifunctional electrocatalyst was developed via electronically modulated bimetallic carbides, showing exemplary activity in both acidic and basic media for HER and OER.
Transition metal carbides (TMCs) have gained considerable attention as a non-precious multifunctional, highly active, stable electrocatalyst for efficient hydrogen evolution reaction (HER) due to its platinum like d-band electronic structure. The efforts to untie the gordian knot of developing a first-rate bifunctional electrocatalyst for efficient water splitting reaction via electronically modulated bimetallic carbides using a dual transition metal strategy have been reported here. Herein we in-situ fabricated a composite architecture consisting of N-doped CNT/graphene hybrid anchoring Co/MoC, Co/WC and Co/VC Via an integrated pyrolysis technique to have a beneficial synergistic co-operation between each component and dual Mott-Schottky junctions resulting in a bifunctional HER and OER (oxygen evolution reaction) active catalyst exhibiting exemplary activity in both acidic and basic media. Co/MoC@NC exhibits the best activity with a lower overpotential of 279 and 260 mV towards OER and 92 and 143 mV towards HER to achieve a current density of 10 mA/cm(2) in basic and acidic media, respectively. Along with this, it presents excellent water splitting performance in basic media, showing a relatively low cell voltage of about 1.686 V for driving a current of 10 mA/cm(2) with decent stability. It is anticipated that the tandem electron transfer between the Co, MoC moieties and nitrogen doping-induced defects in graphene/CNT hybrid-based conductive network support might be a reason for the superiority over other recently reported Mo based carbide materials.
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