Hierarchically Porous W-Doped CoP Nanoflake Arrays as Highly Efficient and Stable Electrocatalyst for pH-Universal Hydrogen Evolution

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DOI

  • Xinqiang Wang, University of Electronic Science and Technology of China
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  • Yuanfu Chen, University of Electronic Science and Technology of China
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  • Bo Yu, University of Electronic Science and Technology of China
  • ,
  • Zegao Wang, Sichuan University
  • ,
  • Haiqi Wang, University of Electronic Science and Technology of China
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  • Baochen Sun, University of Electronic Science and Technology of China
  • ,
  • Wenxin Li, University of Electronic Science and Technology of China
  • ,
  • Dongxu Yang, University of Electronic Science and Technology of China
  • ,
  • Wanli Zhang, University of Electronic Science and Technology of China

It is still challenging to develop high-efficiency and low-cost non-noble metal-based electrocatalysts for hydrogen evolution reaction (HER) in pH-universal electrolytes. Herein, hierarchically porous W-doped CoP nanoflake arrays on carbon cloth (W-CoP NAs/CC) are synthesized via facile liquid-phase reactions and a subsequent phosphorization process. The W-CoP NAs/CC hybrid can be directly employed as a binder-free electrocatalyst and delivers superior HER performance in pH-universal electrolytes. Especially, it delivers very low overpotentials of 89, 94, and 102 mV to reach a current density of 10 mA cm-2 in acidic, alkaline, and neutral electrolytes, respectively. Furthermore, it shows a nearly 100% Faradaic efficiency as well as superior long-term stability with no decreasing up to 36 h in pH-universal electrolytes. The outstanding electrocatalytic performance of W-CoP NAs/CC can be mainly attributed to the porous W-doped nanoflake arrays, which not only afford rich exposed active sites, but also accelerate the access of electrolytes and the diffusion of H2 bubbles, thus efficiently promoting the HER performance. This work provides a new horizon to rationally design and synthesize highly effective and stable non-noble metal phosphide-based pH-universal electrocatalysts for HER.

Original languageEnglish
JournalSmall (Weinheim an der Bergstrasse, Germany)
Volume15
Issue37
Pages (from-to)e1902613
ISSN1613-6810
DOIs
Publication statusPublished - 1 Sep 2019

    Research areas

  • hydrogen evolution reaction, nanoflake arrays, pH-universal electrocatalysts, W-doped CoP

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