Spherical Ni 3 S 2 /Fe‐NiP x Magic Cube with Ultrahigh Water/Seawater Oxidation Efficiency

Abstract The rational construction of earth‐abundant and advanced electrocatalysts for oxygen evolution reaction (OER) is extremely desired and significant to seawater electrolysis. Herein, by directly etching Ni 3 S 2 nanosheets through potassium ferricyanide, a novel self‐sacrificing template strategy is proposed to realize the in situ growth of NiFe‐based Prussian blue analogs (NiFe PBA) on Ni 3 S 2 in an interfacial redox reaction. The well‐designed Ni 3 S 2 @NiFe PBA composite as precursor displays a unique spherical magic cube architecture composed of nanocubes, which even maintains after a phosphating treatment to obtain the derived Ni 3 S 2 /Fe‐NiP x on nickel foam. Specifically, in alkaline seawater,…

• NN
  National Natural Science Foundation of China

  Awards: 2021-ZD-4, 22179104, 22075223
• WU
  Wuhan University
• WU
  Wuhan University of Technology

  Awards: 22075223, 2021‐ZD‐4, 2021-ZD-4
• SK
  State Key Laboratory of Advanced Technology for Materials Synthesis and Processing

  Award: 2021-ZD-4