Achieving Electronic Structure Reconfiguration in Metallic Carbides for Robust Electrochemical Water Splitting
Developing transition metal carbides (TMCs) as multifunctional electrocatalysts to catalyze oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) has been attracting increasing attention. Distinguished from traditional single-source modification, a novel nitrogen-doped carbon hosted TMCs catalyst with dual transition metals to modulate electronic structures of tungsten carbide is reported here. It enables to implement by introducing copper from prefabricated core-shell CuWO4@ZIF-67 precursor and subsequently with an annealing treatment, which not only maximize active Co and W sites, but also endow the construction of a good interconnected conductive network. Consequently, optimized nitrogen-doped carbon supported polymetallic carbide catalyst synthesized at 700 °C (Denoted as S-2) with suitable structure and composition configuration exhibits decent activities with ultralow overpotentials (η) of 238 mV and 98 mV at 10 mA cm-2 for OER and HER along with good overall water splitting performances, surpassing majority of TMCs. This work paves viable ways for rational designing and regulating local electron structures of metallic carbides by introducing appropriate transition metals.
- This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers