Understanding the sulphur-oxygen exchange process of metal sulphides prior to oxygen evolution reaction

Abstract Dynamic reconstruction of metal sulphides during electrocatalytic oxygen evolution reaction (OER) has hampered the acquisition of legible evidence for comprehensively understanding the phase-transition mechanism and electrocatalytic activity origin. Herein, modelling on a series of cobalt-nickel bimetallic sulphides, we for the first time establish an explicit and comprehensive picture of their dynamic phase evaluation pathway at the pre-catalytic stage before OER process. By utilizing the in-situ electrochemical transmission electron microscopy and electron energy loss spectroscopy, the lattice sulphur atoms of (NiCo)S 1.33 particles are revealed to be partially substituted by oxygen from electrolyte…

• NN
  National Natural Science Foundation of China

  Awards: 21922105, 21931001
• HE
  Higher Education Discipline Innovation Project

  Award: B20027
• FR
  Fundamental Research Funds for the Central Universities

  Awards: lzujbky-2021-it12, lzujbky-2021-pd04, lzujbky-2021-37