In situ synthesis of V_2O_3@Ni as an efficient hybrid catalyst for the hydrogen evolution reaction in alkaline and neutral media

摘要

The exploration of cheap and efficient electrodes for hydrogen evolution reactions (HER) is extremely challenging. Herein, we report a newly-designed V2O3@Ni hybrid grown in situ on nickel foam as an efficient HER catalyst. The nickel foam not only promoted the electron transfer rate as a supporting substrate, but also worked as the source of Ni to enhance the integration of catalyst components with abundant active sites. Moreover, benefitting from the synergistic effect of the interface between V2O3 and Ni, which accelerated the entire electrochemical kinetics and facilitated the electron transfer, the in situ V2O3@Ni hybrid catalysts afforded a small overpotential of 47 mV and 100 mV at a current density of 10 mA cm(-2) in 1.0 M KOH and 1.0 M PBS, respectively, and with excellent long-term stability. In addition, this research provides a new route for the fabrication of noble-metal-free electrocatalysts with excellent HER performance over a broad range of pH values. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.