MoFe‐Codoped Ni 3 S 2 /Ni(OH) 2 Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

Efficient, stable, and scalable oxygen evolution reaction (OER) electrocatalysts are highly needed for industrial hydrogen production. Herein, MoFe‐codoped Ni 3 S 2 /Ni(OH) 2 nanosheets with a sample size area of 200 cm 2 are established on Ni foam via a facial hydrothermal method. It is found that Fe 3+ and MoO 4 2− are effectively doped into the Ni 3 S 2 /Ni(OH) 2 nanosheets that are composed by heazlewoodite Ni 3 S 2 and β‐Ni(OH) 2 nanocrystals. Based on the systematic study on the non‐, Fe‐, Mo‐, and MoFe‐doped Ni 3 S 2 /Ni(OH) 2 composites, it is revealed that Fe 3+ and MoO 4 2− play important roles in reducing the interfacial charge transfer and increasing the electrochemical active surface area, respectively. When doping at a MoFe molar ratio of 5/3, the synergistic effect of Fe and Mo leads to an optimum OER property with low overpotentials of η 100 (263 mV) and η 500 (301 mV), Tafel plot of 52 mV dec −1 , and long durability for at least 24 h. An effective strategy for high‐efficiency, long‐durability, and nonprecious OER electrocatalysts with promising applications is provided.