催化作用
过电位
塔菲尔方程
离解(化学)
吸附
化学
活动站点
无机化学
氢
反应中间体
材料科学
化学工程
物理化学
有机化学
电化学
工程类
电极
作者
Dung Van Dao,Giovanni Di Liberto,Sunny Yadav,Periyayya Uthirakumar,Kai Chen,Gianfranco Pacchioni,In−Hwan Lee
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-01-19
卷期号:24 (4): 1261-1267
标识
DOI:10.1021/acs.nanolett.3c04237
摘要
This work evaluates the feasibility of alkaline hydrogen evolution reaction (HER) using Pt single-atoms (1.0 wt %) on defect-rich ceria (Pt1/CeOx) as an active and stable dual-site catalyst. The catalyst displayed a low overpotential and a small Tafel slope in an alkaline medium. Moreover, Pt1/CeOx presented a high mass activity and excellent durability, competing with those of the commercial Pt/C (20 wt %). In this picture, the defective CeOx is active for water adsorption and dissociation to create H* intermediates, providing the first site where the reaction occurs. The H* intermediate species then migrate to adsorb and react on the Pt2+ isolated atoms, the site where H2 is formed and released. DFT calculations were also performed to obtain mechanistic insight on the Pt1/CeOx catalyst for the HER. The results indicate a new possibility to improve the state-of-the-art alkaline HER catalysts via a combined effect of the O vacancies on the ceria support and Pt2+ single atoms.
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