Heterostructured ZnFe 2 O 4 @Ni 3 S 2 nanosheet arrays on Ni foam as an efficient oxygen evolution catalyst.

Honeycomb-like ZnFe 2 O 4 @Ni 3 S 2 hierarchical nanosheet arrays on Ni foam (NF) were fabricated via a combined hydrothermal and electrodeposition method. The electrode exhibits high oxygen evolution reaction (OER) activity with low overpotentials of 254 mV at 10 mA cm -2 and 290 mV at 50 mA cm -2 , a small Tafel slope of 39.29 mV dec -1 and excellent durability in an alkaline electrolyte.