Preparation of S-Doped Ni-Mn-Fe Layered Hydroxide for High-Performance of Oxygen Evolution Reaction

A novel catalyst with a metal sulfide/hydroxide heterostructure was prepared by introducing sulfur ions into NiMnFe layered hydroxide by a simple hydrothermal method, using a series of characterization methods and electrochemical tests to explore the optimal sulfur ion doping amount. The XPS results show that the introduction of sulfur ions leads to a change in metal electron delocalization, which is conducive to the OER procedure. The newly formed metal sulfide can not only improve the conductivity of NiMnFe LDH/NF electrode materials but also enhance the intrinsic catalytic activity of the materials. The electrochemical performance indicated that the S2-NiMnFe LDH/NF catalyst required only 205 mV overpotential to provide a current density of 10 mA−2, and the Tafel slope was only 45.79 mV dec−1. In addition, the large turnover frequency value (1.2614 S−1) reflects the excellent intrinsic activity of the novel catalytic material.