Trimetallic Sulfide Nanoflowers Arrays on Ni foams as Self-supported Electrodes for Hydrogen Evolution Reactions

The optimization of a non-precious metal-based electrocatalyst for hydrogen evolution reaction (HER) is a crucial yet formidable challenge. Herein, we report the synthesis of iron-nickel nano-leaves of metal-organic framework (Mil-53) with uniform growth on a nickel foam (NF) substrate, which served as the template for the subsequent growth of ultra-thin molybdenum disulfide nanosheets via a hydrothermal method. The resulting Ni3S2/MoS2/Fe3S4@NF heterostructure catalyst exhibited exceptional electrocatalytic activity for HER in a 1M KOH solution, requiring only 54 mV overpotential to achieve a current density of 10 mA cm-2, with a Tafel slope of 86.5 mV dec-1. Our study presents a highly effective non-precious metal electrocatalyst for HER, which holds great potential for practical applications in the field of renewable energy.