In Situ Raman Study of Surface Reconstruction of FeOOH/Ni 3 S 2 Oxygen Evolution Reaction Electrocatalysts

Abstract Construction of heterojunctions is an effective strategy to enhanced electrocatalytic oxygen evolution reaction (OER), but the structural evolution of the active phases and synergistic mechanism still lack in‐depth understanding. Here, an FeOOH/Ni 3 S 2 heterostructure supported on nickel foam (NF) through a two‐step hydrothermal‐chemical etching method is reported. In situ Raman spectroscopy study of the surface reconstruction behaviors of FeOOH/Ni 3 S 2 /NF indicates that Ni 3 S 2 can be rapidly converted to NiOOH, accompanied by the phase transition from α ‐FeOOH to β ‐FeOOH during the OER process. Importantly, a deep analysis of Ni─O bond reveals that the phase transition of FeOOH can regulate the…

• NN
  National Natural Science Foundation of China

  Awards: 22209129, 22071038, 21871065