Preparation of NiCo2O4 Nanosheet Arrays and its High Catalytic Performance for H2O2 Electroreduction

Abstract Ni foam supporting‐NiCo 2 O 4 nanosheet arrays (NiCo 2 O 4 /Ni foam) are successfully prepared by electrodeposition of the hydroxide precursor, followed by a thermal treatment in air without any template and surfactant. The morphology of NiCo 2 O 4 nanosheet arrays is characterized by scanning electron microscope and transmission electron microscopy. The structure is analyzed using X‐ray diffractometer, X‐ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The catalytic performance of NiCo 2 O 4 /Ni foam electrode for H 2 O 2 electroreduction in KOH solution is evaluated by means of cycle voltammetry and chronoamperometry, which exhibits an excellent catalytic performance and superior stability for H 2 O 2 electroreduction. The reduction current density of H 2 O 2 on NiCo 2 O 4 /Ni foam electrode is 0.378 A cm −2 at –0.4 V in the solution containing 3.0 mol L −1 KOH + 0.4 mol L −1 H 2 O 2 , which is much larger than that on other metal oxides reported previously.