Preparation of textured and transparent BiVO4 photoelectrodes based on Mo-doped BiVO4 nanoparticles for constructing a stand-alone tandem water splitting device†
Crystallographic orientation control is an effective method to improve the photoelectrochemical water splitting efficiency of BiVO4 photoanodes. Herein, textured and transparent Mo–BiVO4 photoanodes are fabricated by spin-coating Mo-doped BiVO4 nanoparticles on FTO. The photoelectrodes exhibit a current density of 4.15 mA cm−2 and 2.50 mA cm−2 for sulfite and water oxidation, respectively. By connecting the photoelectrode with a CsPbBrI2 perovskite solar cell, a stand-alone tandem water splitting device with a current density of 2.13 mA cm−2 and an STH of 2.43% can be achieved.