Hierarchical nickel cobalt sulfide nanosheet arrays supported on CuO/Cu hybrid foams as a rationally designed core–shell dendrite electrocatalyst for an efficient oxygen evolution reaction

Porous nickel cobalt sulfide shells decorated on a CuO nanowire core supported on a CuO/CF hybrid foam form the unique 3D self-standing core–shell dendritic electrocatalyst of Ni–Co–S@CuO/CF for OERs, with high activity and long-term cycling cyclic stability.