Three-dimensional ZnCo/MoS_2-Co_3S_4/NF heterostructure supported on nickel foam as highly efficient catalyst for hydrogen evolution reaction

摘要

Exploring inexpensive and earth-abundant electrocatalysts for hydrogen evolution reactions is crucial in electrochemical sustainable chemistry field. In this work, a high efficiency and inexpensive non-noble metal catalysts as alternatives to hydrogen evolution reaction (HER) was designed by one-step hydrothermal and two-step electrodeposition method. The as-prepared catalyst is composed of the synergistic MoS2-Co3S4 layer decorated by ZnCo layered double hydroxides (ZnCo-LDH), which forms a multi-layer heterostructure (ZnCo/MoS2-Co3S4/NF). The synthesized ZnCo/MoS2-Co3S4/NF exhibits a small overpotential of 31 mV and a low Tafel plot of 53.13 mV dec(-1) at a current density of 10 mA cm(-2), which is close to the HER performance of the overpotential (26 mV) of Pt/C/NF. The synthesized ZnCo/MoS2-Co3S4/NF also has good stability in alkaline solution. The excellent electrochemical performance of ZnCo/MoS2-Co3S4/NF electrode originates from its abundant active sites and good electronic conductivity brought by the multilayer heterostructure. This work provides a simple and feasible way to design alkaline HER electrocatalysts by growing heterostructures on macroscopic substrates. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.