Z‐Scheme Photocatalytic Water Splitting on a 2D Heterostructure of Black Phosphorus/Bismuth Vanadate Using Visible Light

Abstract

Abstract Spontaneously solar‐driven water splitting to produce H 2 and O 2 , that is, the conversion of solar energy to chemical energy is a dream of mankind. However, it is difficult to make overall water splitting feasible without using any sacrificial agents and external bias. Drawing inspiration from nature, a new artificial Z‐scheme photocatalytic system has been designed herein based on the two‐dimensional (2D) heterostructure of black phosphorus (BP)/bismuth vanadate (BiVO 4 ). An effective charge separation makes possible the reduction and oxidation of water on BP and BiVO 4 , respectively. The optimum H 2 and O 2 production rates on BP/BiVO 4 were approximately 160 and 102 μmol g −1 h −1 under irradiation of light with a wavelength longer than 420 nm, without using any sacrificial agents or external bias.