过电位
拉曼光谱
材料科学
电解
纳米颗粒
氢
碳纤维
纳米晶
电化学
化学工程
纳米技术
分析化学(期刊)
化学
电解质
电极
物理化学
复合数
物理
有机化学
复合材料
工程类
光学
色谱法
作者
Rui Yao,Kaian Sun,Kaiyang Zhang,Yun Wu,Yujie Du,Qiang Zhao,Guang Liu,Chen Chen,Yuhan Sun,Jinping Li
标识
DOI:10.1038/s41467-024-46553-9
摘要
Abstract Continuous and effective hydrogen evolution under high current densities remains a challenge for water electrolysis owing to the rapid performance degradation under continuous large-current operation. In this study, theoretical calculations, operando Raman spectroscopy, and CO stripping experiments confirm that Ru nanocrystals have a high resistance against deactivation because of the synergistic adsorption of OH intermediates (OH ad ) on the Ru and single atoms. Based on this conceptual model, we design the Ni single atoms modifying ultra-small Ru nanoparticle with defect carbon bridging structure (UP-RuNi SAs /C) via a unique unipolar pulse electrodeposition (UPED) strategy. As a result, the UP-RuNi SAs /C is found capable of running steadily for 100 h at 3 A cm −2 , and shows a low overpotential of 9 mV at a current density of 10 mA cm −2 under alkaline conditions. Moreover, the UP-RuNi SAs /C allows an anion exchange membrane (AEM) electrolyzer to operate stably at 1.95 V cell for 250 h at 1 A cm −2 .
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