An organometal halide perovskite (OHP) photocathode integrated with a MoS2 catalyst achieved long-term photoelectrochemical (PEC) stability and high half-cell solar-to-hydrogen conversion efficiency (HC-STH).
Formation of the additional 2-D (MA)2MnCl4 phase suppresses the efficient Mn2+ doping into halide perovskite structures during the reprecipitation process.