Controllable atomic defect engineering in layered NixFe1−x(OH)2 nanosheets for electrochemical overall water splitting

Defect-rich Ni_xFe_1−x(OH)₂ nanosheets fabricated via an in situ oxidation process exhibit efficient overall water splitting under a small overpotential of ∼244 mV and a high solar-to-hydrogen conversion efficiency of ∼10.3%.