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Tuning quaternary hybride Co–Ni–S–Se composition as a bifunctional electrocatalyst for hydrogen and oxygen evolution reactions

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  • Xiaojiao Fang, MIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology
  • ,
  • Zegao Wang, College of Materials Science and Engineering, Sichuan University
  • ,
  • Yin Wang
  • ,
  • Shifei Kang, Department of Environmental Science and Engineering, University of Shanghai for Science and Technology
  • ,
  • Zaixing Jiang, MIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology
  • ,
  • Mingdong Dong

Developing high-efficiency and earth-abundant electrocatalysts for electrochemical water splitting is of paramount importance for energy conversion. Although tremendous effort has been paid to transition metal (TM) material-based electrocatalysts, rational design and controllable synthesis of fine structures to fully utilize the latent potential of TM materials remain great challenges. We herein report a composition-tuning strategy to achieve rational structure control of quaternary Co–Ni–S–Se materials through a facile one-pot hydrothermal method, in which earth-abundant Ni is introduced into a CoSxSe2-x matrix to optimize the morphology and electronic structure of the quaternary electrocatalyst. Because of the introduction of Ni, this novel Co–Ni–S–Se quaternary system shows better catalytic activity for water splitting with Tafel slopes of 42.1 mV dec−1 for hydrogen evolution reaction (HER) and 65.5 mV dec−1 for oxygen evolution reaction (OER), respectively, compared with its precursor Co–S–Se ternary system. For stability, there is negligible fading after long-term electrochemical test. Our work not only provides a novel thinking to introduce nickel into Co–S–Se ternary system by a facile hydrothermal synthesis for electrochemical water splitting, but also this quaternary system realizes bifunctional catalysis and better electrochemical performance relative to the ternary counterpart.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Pages (from-to)27685-27694
Number of pages10
Publication statusPublished - Oct 2019

    Research areas

  • Composition-tuning, Co–Ni–S–Se, Hydrogen evolution reaction, Oxygen evolution reaction, Quaternary

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