塔菲尔方程
过电位
催化作用
材料科学
兴奋剂
电化学
氢
纳米技术
吸附
化学工程
无机化学
电化学能量转换
物理化学
电极
光电子学
有机化学
化学
工程类
作者
Wei Gao,Ming Yan,Ho-Fai Cheung,Zhaoming Xia,Xuemei Zhou,Yuanbin Qin,Chun‐Yuen Wong,Johnny C. Ho,Chun‐Ran Chang,Yongquan Qu
出处
期刊:Nano Energy
[Elsevier]
日期:2017-08-01
卷期号:38: 290-296
被引量:212
标识
DOI:10.1016/j.nanoen.2017.06.002
摘要
Doping foreign metal ions into catalysts is considered as an effective approach to optimize the catalytic sites and improve their performance. Here, we develop and demonstrate the concept of rare-earth elemental doping by Ce into host catalysts of CoP in modulating their electronic structures and decreasing their adsorption free energy of hydrogen for the enhanced hydrogen evolution reaction (HER) performance via a complementary theoretical and experimental approach. In contrast to undoped catalysts, the Ce-doping can facilitate lower overpotential, Tafel slope and charge transfer resistance as well as larger electrochemically active surface area and turnover frequency to deliver superb catalytic activity and stability. In particular, the catalyst with optimized doping amount exhibits ultra-low overpotentials of 54 and 92 mV at 10 mA cm−2 in acidic and basic media, respectively, among many recently-reported CoP-based catalysts. Doping Ce into CoP not only illustrates benefits in improving the catalytic property for HER, but also opens up a novel view of doping rare earth elements into electrocatalysts for regulating their physiochemical and electrochemical properties.
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