One-step fabrication of heterostructured CoNi-LDH@NiCo alloy for effective alkaline hydrogen evolution

Construction of heterostructured electrocatalyst with interface effect is an effective strategy for enhancing the alkaline hydrogen evolution efficiency, whereas this process often requires complex treatments. Herein, we proposed a one-step electrodeposition method to obtain heterostructured CoNi-LDH@NiCo alloy on Ni foam (NF) through a competition reduction between NO3- group and metal cations in the electrolyte. The HER performance for the CoNi-LDH@NiCo alloy achieved the current density of 10 mA cm(-2) at overpotential of 69 mV in 1 M KOH solution, improved 60% for h10 by comparing with the pristine NiCo alloy. Utilizing the specialized adsorption of CoNi-LDH for H2O and the featured attractiveness of NiCo alloy for H atom, the interface effect of the heterostructure electrocatalyst accelerated the dissociation of water molecules and elevated the catalytic kinetics dramatically. This work points out a potential approach towards the easy construction of inexpensive heterostructured electrocatalysts for HER activity in alkaline medium. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The study successfully prepared CoNi-LDH@NiCo alloy through a one-step electrodeposition method, demonstrating excellent alkaline hydrogen evolution performance in alkaline solution, with a significant impact on the dissociation of water molecules and catalytic kinetics.