过电位
电催化剂
塔菲尔方程
氢溢流
催化作用
氢
氧化物
材料科学
分解水
铂金
化学工程
无机化学
化学
纳米技术
物理化学
电化学
电极
有机化学
光催化
工程类
冶金
作者
Jie Dai,Yinlong Zhu,Yu Chen,Xue Wen,Mingce Long,Xinhao Wu,Zhiwei Hu,Daqin Guan,Xixi Wang,Chuan Zhou,Qian Lin,Yifei Sun,Shih‐Chang Weng,Huanting Wang,Wei Zhou,Zongping Shao
标识
DOI:10.1038/s41467-022-28843-2
摘要
Improving the catalytic efficiency of platinum for the hydrogen evolution reaction is valuable for water splitting technologies. Hydrogen spillover has emerged as a new strategy in designing binary-component Pt/support electrocatalysts. However, such binary catalysts often suffer from a long reaction pathway, undesirable interfacial barrier, and complicated synthetic processes. Here we report a single-phase complex oxide La2Sr2PtO7+δ as a high-performance hydrogen evolution electrocatalyst in acidic media utilizing an atomic-scale hydrogen spillover effect between multifunctional catalytic sites. With insights from comprehensive experiments and theoretical calculations, the overall hydrogen evolution pathway proceeds along three steps: fast proton adsorption on O site, facile hydrogen migration from O site to Pt site via thermoneutral La-Pt bridge site serving as the mediator, and favorable H2 desorption on Pt site. Benefiting from this catalytic process, the resulting La2Sr2PtO7+δ exhibits a low overpotential of 13 mV at 10 mA cm-2, a small Tafel slope of 22 mV dec-1, an enhanced intrinsic activity, and a greater durability than commercial Pt black catalyst.
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