Enhanced Photoelectrochemical Water Splitting Using NiMoO/BiVO/Sn-Doped WO Double Heterojunction Photoanodes.

Efficient photoelectrochemical (PEC) water splitting systems in photoelectrodes are primarily challenged by electron-hole pair recombination. Constructing a heterostructure is an effective strategy to overcome this issue and to enhance PEC efficiency. In this study, we integrated NiMoO, known for its proper electrocatalytic conductivity, into a BiVO/Sn-doped WO heterojunction using solution-based hydrothermal and spin-coating methods, forming an innovative double heterojunction concept.