Figure 8.

(a) Schematic of energy band diagram of the black phosphorus monolayer photocathode with titanium dioxide passivation layer. (b) Schematic of the photocathode with p-type semiconductor photoelectrode and catalyst. (c) Electron transfer paths for a bare photoelectrode and a photoelectrode with catalyst (Reproduced with permission of [72]. Copyright Springer international Publishing, 2016). (d) Photoelectrochemical water splitting using monolayer black phosphorus photocathode with passivation layer and titanium dioxide photocatalyst.