Petal-like hierarchical array of ultrathin Ni(OH)2 nanosheets decorated with Ni(OH)2 nanoburls: a highly efficient OER electrocatalyst

A solvothermally synthesized petal-like 3D hierarchical array of β-Ni(OH)₂ nanosheets and nanoburls has displayed an abnormal enhancement in activity in the OER as a consequence of surface faceting of planes from (001) to (101) and (202) within a minimum number of potential sweeps in addition to the formation of oxyhydroxide.