Etching Accelerates Reconstruction and Activates Lattice Oxygen of Anion Vacancies‐Enriched Cobalt‐Iron Phosphide/(Oxy)Hydroxide Nanohybrid Frameworks for Enhanced Oxygen Evolution

Abstract Transition metal phosphides (TMPs) nanostructures are considered to be promising pre‐catalysts for electrochemical oxygen evolution reaction (OER). Nonetheless, most TMPs only experience limited surface reconstruction during OER, resulting in fewer active layer, insufficient active sites and thus unsatisfactory performance. Thereby, finely control the reconstruction level is crucial but still challenging. Here, the Co 0.7−x Fe 0.3−y P/Co x Fe y OOH nanohybird frameworks with numerous crystalline/amorphous interfaces are fabricated by alkali etching of hollow crystalline Co 0.7 Fe 0.3 P nanocubes, leading to in‐situ surface growth of amorphous Co x Fe y OOH nanosheets subunits. Such Co 0.7−x Fe 0.3−y…

• NN
  National Natural Science Foundation of China

  Awards: 21 671 106, 22102073