Affiliation:
1. Center for Nanoparticle Research Institute for Basic Science (IBS) Seoul 08826 Republic of Korea
2. School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National University Seoul 08826 Republic of Korea
Abstract
AbstractHigh‐entropy spinel oxides (HESOs) are a promising class of electrocatalysts whose material properties and catalytic activity can be finely tuned by controlling the elemental composition. Although numerous HESOs are already reported, their compositions are primarily limited to the first‐row transition metals. Herein, the synthesis of a high‐entropy spinel (CrFeCoNiMo)3O4 nanosheet (HEO‐NS) and its application as oxygen evolution reaction (OER) catalyst are reported. The high‐entropy spinel displays a low overpotential of 255.3 mV at a current density of 10 mA cm−2 and excellent stability, outperforming the IrO2 benchmark. Careful analysis with X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption spectroscopy (XAS) reveals that the incorporation of high‐valence Cr and Mo can activate the lattice oxygen by weakening the metal–oxygen bond and promoting the lattice oxygen mechanism (LOM). Furthermore, the catalyst can achieve a high current density of 1 A cm−2 at 1.71 V in a lab‐scale electrolyzer, demonstrating the potential of HESOs for practical application.
Funder
Institute for Basic Science
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献