Modulating electronic structure of CoP electrocatalysts towards enhanced hydrogen evolution by Ce chemical doping in both acidic and basic media

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Ming Yan
  • Ho-Yuen Cheung
  • Zhaoming Xia
  • Xuemei Zhou
  • Yuanbin Qin
  • Chun-Ran Chang
  • Yongquan Qu

Detail(s)

Original languageEnglish
Pages (from-to)290-296
Journal / PublicationNano Energy
Volume38
Online published3 Jun 2017
Publication statusPublished - Aug 2017

Abstract

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.

Research Area(s)

  • Cerium-doping, Cobalt phosphide, Electrocatalysis, Hydrogen evolution reaction

Citation Format(s)

Modulating electronic structure of CoP electrocatalysts towards enhanced hydrogen evolution by Ce chemical doping in both acidic and basic media. / Gao, Wei; Yan, Ming; Cheung, Ho-Yuen; Xia, Zhaoming; Zhou, Xuemei; Qin, Yuanbin; Wong, Chun-Yuen; Ho, Johnny C.; Chang, Chun-Ran; Qu, Yongquan.

In: Nano Energy, Vol. 38, 08.2017, p. 290-296.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal