Hierarchical sheet-on-sheet heterojunction array of a β-Ni(OH)2/Fe(OH)3 self-supporting anode for effective overall alkaline water splitting

Hierarchical sheet-on-sheet β-Ni(OH) 2 /Fe(OH) 3 heterojunction array displayed excellent OER performance and stability. The two-electrode configuration on NiFe-HD/Pre-NF||CoP/P-NiO/NF also presented low cell voltage in overall alkaline water splitting.