过电位
材料科学
塔菲尔方程
催化作用
析氧
氧化物
化学工程
离子交换
纳米技术
金属
纳米颗粒
无机化学
离子
物理化学
电极
化学
冶金
电化学
有机化学
工程类
作者
Kanghua Miao,Wendan Jiang,Zhao-Qian Chen,Yan Luo,Dong Xiang,Chaohui Wang,Xiongwu Kang
标识
DOI:10.1002/adma.202308490
摘要
High entropy metal oxides (HEO) are superior to many reactions involving multi-step elementary reactions. However, controlled synthesis of hollow-structured HEO catalysts, which offers large surface area and fast mass transfer kinetics, remains challenging and unexplored due to the complicated metal precursors. Herein, a metal organic framework-templated synthesis of hollow-structured and polyhedron-shaped HEO catalysts assembled with ultra-small nanoparticles, with up to ten metal elements, can be achieved, by taking advantage of the ion-exchange method. ZnFeNiCuCoRu-O HEO catalyst displays excellent activity and ultra-stability for oxygen evolution reaction in full pH range, with an overpotential of 170 mV at a current density of 10 mA cm-2 , a Tafel slope of 56 mV dec-1 , and a decay of activity by 7% in 30 h in alkaline medium, as well as a 12% and 8% decay in acidic and neutral medium, respectively. DFT calculation indicates that the energy barrier of the potential determining step on Ru-Fe bridge site is significantly lower than any other Ru-related bridge sites for the unique hollow structured HEO structures. This work highlights the importance of ion-exchange method in preparing highly stable and active hollow-structured HEOs catalysts toward highly efficient energy conversion and storage devices.
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