MoFe‐Codoped Ni₃S₂/Ni(OH)₂ Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

Abstract

Efficient, stable, and scalable oxygen evolution reaction (OER) electrocatalysts are highly needed for industrial hydrogen production. Herein, MoFe‐codoped Ni3S2/Ni(OH)2 nanosheets with a sample size area of 200 cm2 are established on Ni foam via a facial hydrothermal method. It is found that Fe3+ and MoO42− are effectively doped into the Ni3S2/Ni(OH)2 nanosheets that are composed by heazlewoodite Ni3S2 and β‐Ni(OH)2 nanocrystals. Based on the systematic study on the non‐, Fe‐, Mo‐, and MoFe‐doped Ni3S2/Ni(OH)2 composites, it is revealed that Fe3+ and MoO42− 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 η100 (263 mV) and η500 (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.

A self-supported bifunctional MoNi4framework with iron doping for ultra-efficient water splitting

“…The binding energies at 718.2 and 705.1 eV are related to Fe 0 2p 1/2 and Fe 0 2p 3/2 , and the peaks located at 723.6 and 710.4 eV are assigned to Fe 3+ 2p 1/2 and Fe 3+ 2p 3/2 species. 40–42 However, after undergoing OER measurement, only the signal of Fe 3+ (712.4 eV) can be detected in the XPS spectrum (Fig. 3f).…”

Well‐Monodispersed Iron‐Doped InOOH Nanoparticles with Enhanced Activity for Oxygen Evolution

“…Smaller-sized nanostructured materials could provide a large surface area with numerous reaction sites, improving electrocatalytic performances [30] Taking this into account, reducing the size of catalysts and producing low-dimensional nanostructure to increase the number of active sites is a practical way to enhance OER activity. [31][32][33] For example. well-designed nanoparticles, which have intrinsic merits beneficial for OER such as large specific surface area, insufficient coordination of surface atoms, defects on surface and enhanced surface activity, can be a promising option for OER catalyst.…”

“…Nanostructure design is one of the efficient ways to implement it. Smaller‐sized nanostructured materials could provide a large surface area with numerous reaction sites, improving electrocatalytic performances Taking this into account, reducing the size of catalysts and producing low‐dimensional nanostructure to increase the number of active sites is a practical way to enhance OER activity . For example.…”