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

Xiaojiao Fang, Zegao Wang, Yin Wang, Shifei Kang, Zaixing Jiang, Mingdong Dong*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

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
Volume44
Issue51
Pages (from-to)27685-27694
Number of pages10
ISSN0360-3199
DOIs
Publication statusPublished - Oct 2019

Keywords

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

Fingerprint

Dive into the research topics of 'Tuning quaternary hybride Co–Ni–S–Se composition as a bifunctional electrocatalyst for hydrogen and oxygen evolution reactions'. Together they form a unique fingerprint.

Cite this