CoP nanosheet assembly grown on carbon cloth: A highly efficient electrocatalyst for hydrogen generation

Xiulin Yang, Ang-Yu Lu, Yihan Zhu, Mohamed N. Hedhili, Shixiong Min, Kuo-Wei Huang, Yu Han, Lain-Jong Li

Research output: Contribution to journalArticlepeer-review

244 Scopus citations

Abstract

There exists a strong demand to replace expensive noble metal catalysts with cheap metal sulfides or phosphides for hydrogen evolution reaction (HER). Recently metal phosphides such as NixP, FeP and CoP have been considered as promising candidates to replace Pt cathodes. Here we report that the nanocrystalline CoP nanosheet assembly on carbon cloth can be formed by a two-step process: electrochemical deposition of Co species followed by gas phase phosphidation. The CoP catalyst in this report exhibits a Tafel slope of 30.1mV/dec in 0.5M H2SO4 and 42.6mV/dec in 1M KOH. The high HER performance of our CoP catalysts is attributed to the rugae-like morphology which results in a high double-layer capacitance and high density of active sites, estimated as 7.77×1017sites/cm2. © 2015 Elsevier Ltd.
Original languageEnglish (US)
Pages (from-to)634-641
Number of pages8
JournalNano Energy
Volume15
DOIs
StatePublished - Jul 2015

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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