NiCo2O4 nanoframes with a nanosheet surface as efficient electrocatalysts for the oxygen evolution reaction

NiCo2O4 nanoframes with a nanosheet surface are fabricated using Cu2O nanoframes as a template. The size of the NiCo2O4 nanoframe is about 450 nm, and the thickness of the surface nanosheet is about 10 nm. Compared with Co3O4 and NiO nanoframes, NiCo2O4 nanoframes as electrocatalysts demonstrate much higher catalytic activity and stability for the oxygen evolution reaction (OER). The superior electrocatalytic performance of NiCo2O4 nanoframes might be attributed to the large surface area and synergistic effect of Ni and Co.