Porous coordination polymer-derived ultrasmall CoP encapsulated in nitrogen-doped carbon for efficient hydrogen evolution in both acidic and basic media

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  • Shuai Liu, Hebei University of Technology, Shandong University
  • ,
  • Anning Jiang, Shandong University
  • ,
  • Zegao Wang
  • ,
  • Mengxia Lin, Hebei University of Technology
  • ,
  • Dan Xia, Hebei University of Technology
  • ,
  • Qiang Li, Shandong University
  • ,
  • Mingdong Dong

Exploiting high-efficient and stable non-precious metal-based electrocatalysts toward hydrogen evolution reaction (HER) is of enormous significance to address the shortage of global power source, but there remain major challenges. Here we present a facile and controllable strategy to synthesize a strongly coupled ultrasmall-cobalt phosphide/nitrogen-doped graphitic carbon (u-CoP@NC) hybrid structure via phosphorization from a porous coordination polymer (PCP) precursor. The PCP-derived u-CoP@NC exhibits remarkable activity and stability for HER, achieving a current density of 10 mA cm−2 with a low overpotential of 131 mV in acidic media and 111 mV in basic media. The corresponding Tafel slopes present in acidic and basic media are 62.7 and 70.3 mV dec−1, respectively. Results reveal that the enhanced electrocatalytic performance of u-CoP@NC originates from the strongly coupled u-CoP nanoparticles and graphitic carbon layer, and the perfect dispersity of the active sites. This research opens up new avenues for designing earth-abundant metal-based electrocatalysts with high capability for water splitting applications.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Pages (from-to)1729-1737
Number of pages9
Publication statusPublished - 2020

    Research areas

  • Cobalt phosphide, Electrocatalyst, Hydrogen evolution reaction, Nitrogen-doped graphitic carbon layer, Porous coordination polymer

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