材料科学
合金
塔菲尔方程
纳米晶
催化作用
电解质
电催化剂
钌
电化学
化学工程
分解水
离解(化学)
氢
纳米技术
无机化学
电极
冶金
物理化学
有机化学
生物化学
化学
工程类
光催化
作者
Chaohui Wang,Jun Zhang,Kanghua Miao,M. S. Long,S. L. Lai,Shijun Zhao,Xiongwu Kang
标识
DOI:10.1002/adma.202400433
摘要
Abstract Integrating high‐entropy philosophy and nanocrystal‐specific orientation into a single catalyst represents a promising strategy in development of high‐performance catalysts. Nonetheless, shape‐controlled synthesis of high‐entropy alloy (HEA) nanocrystals is challenging owing to the distinct redox potentials and growth dynamics of metal elements. Herein, a one‐pot co‐reduction method is developed to fabricate ruthenium (Ru)‐doped PtFeNiCuW octahedral HEA nanocrystals onto carbon nanotubes (Ru–PtFeNiCuW/CNTs). It is demonstrated that Ru dopants and W(CO) 6 promote the concurrent reduction and growth of other metal precursors to obtain higher yield and larger size of HEA nanocrystals, despite low Ru content in Ru–PtFeNiCuW/CNTs. As an electrocatalyst toward hydrogen evolution reaction (HER), Ru–PtFeNiCuW/CNTs exhibits low overpotentials of 9, 16, and 34 mV at a current density of 10 mA cm −2 and Tafel slopes of 19.2, 27.9, and 23.1 mV dec −1 in acidic, alkaline, and neutral electrolytes, respectively. As a cathodic catalyst, Ru–PtFeNiCuW/CNTs operates for up to 1500 and 1200 h in acidic and alkaline electrolyte, respectively, at a current density of 50 mA cm −2 in a two‐electrode system for full water splitting. Theoretical calculations reveal accelerated kinetics of H 2 O dissociation on W sites and *H desorption on hollow Cu–Cu–Cu and Cu–Cu–Pt sites.
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