Universal avenue to metal-transition metal carbide grafted N-doped carbon framework as efficient dual Mott-Schottky electrocatalysts for water splitting

Raj, G and Das, D and Sarkar, B and Biswas, S and Nanda, KK (2022) Universal avenue to metal-transition metal carbide grafted N-doped carbon framework as efficient dual Mott-Schottky electrocatalysts for water splitting. In: Sustainable Materials and Technologies, 33 .

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Abstract

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/cm2 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/cm2 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.

Item Type:	Journal Article
Publication:	Sustainable Materials and Technologies
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Catalyst activity; Doping (additives); Electrocatalysts; Electronic structure; Graphene; Hybrid materials; Molybdenum compounds; Transition metals; Tungsten carbide; Vanadium compounds, Acidic media; Basic media; CNT- graphene hybrid; Hydrogen evolution reactions; Metal transition; Mott-Schottky; N-doped; Total water splitting; Transition metals carbides; Water splitting, Electrocatalysis
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	20 Jul 2022 11:06
Last Modified:	20 Jul 2022 11:06
URI:	https://eprints.iisc.ac.in/id/eprint/74933

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