三元运算
硒化物
催化作用
析氧
密度泛函理论
材料科学
吸附
组态熵
化学工程
化学
热力学
无机化学
纳米技术
物理化学
计算化学
硒
生物化学
电极
冶金
电化学
物理
计算机科学
工程类
程序设计语言
作者
Zhiqiang Jiang,Yuan Yuan,Li Tan,Minjie Li,Kun Peng
标识
DOI:10.1016/j.apsusc.2023.157282
摘要
High-entropy materials (HEMs) have emerged as promising candidates of electrocatalysts owing to their unique structural features. Herein, flower-like high-entropy selenide (CoNiFeCuCr)Se (F-HES) is prepared by a two-step solvothermal method. F-HES demonstrates outstanding oxygen evolution reaction (OER) activity compared to other high-entropy catalysts, characteristic of 252 mV@100 mA·cm−2 along with excellent stability of 50 h, profiting from its specific structure and wide mesoporous distribution. The performance surpasses their quaternary, ternary, binary and unary counterparts can be attributed to the synergistic interaction among multiple metal species. Further investigations reveal the formation of metal (oxy)hydroxide where Co and Ni are more easily activated and the adsorption of selenate during anodization. Density functional theory (DFT) calculations demonstrate high-entropy coordination environment and surface-adsorbed selenate result in the enhanced intrinsic activity of active site and faster reaction kinetics. Meanwhile, the presence of interfacial selenate also improves the wetability of catalyst surface. This work provides a promising platform to design novel, outstanding HEMs for practical water electrolysis.
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