Spatially-controlled NiCo₂O₄@MnO₂ core–shell nanoarray with hollow NiCo₂O₄ cores and MnO₂ flake shells: an efficient catalyst for oxygen evolution reaction

Control of structures and components of the nanoarray catalysts is very important for electrochemical energy conversion. Herein, unique NiCo₂O₄@MnO₂ core–shell nanoarray with hollow NiCo₂O₄ Cores and MnO₂ flake shells is in situ fabricated on carbon textile via a two-step hydrothermal treatment followed by a subsequent annealing. The as-made nanoarray is highly active and durable catalyst for oxygen evolution reaction in alkaline media attribute to the synergetic effect derived from spatially separated nanoarray with favorable NiCo₂O₄ and MnO₂ compositions. (paper)