 This study demonstrates that the surface modification of BiV04 with hydrophobic polymer coatings can increase its thermodynamic activity towards water oxidation and reduce the rate of H2O2 decomposition. As a result, this method can be used to improve the performance of BiV04-based photoelectrochemical cells by increasing their ferridaic efficiency and reducing the amount of H2O2 produced. This article was authored by Mano, Meigeng, Xianglifang, and others.