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. The resulting NiMoO/BiVO/Sn:WO triple-layer heterojunction photoanode exhibits a photocurrent density of 2.06 mA cm in a potassium borate buffer (KBi) electrolyte at 1.23 V vs RHE, outperforming the bilayer BiVO/Sn:WO heterojunction (1.45 mA cm) and Sn:WO photoanodes (0.55 mA cm) by approximately 1.4 and 3.7 times, respectively. Remarkably, the NiMoO/BiVO/Sn:WO double heterojunction photoanode exhibits notable stability, showing only an approximate 30% reduction in initial photocurrent density after 10 h of measurement in the KBi electrolyte without a hole scavenger. This stability is attributed to the excellent corrosion resistance of the thin NiMoO layer, effectively protecting the bilayer BiVO/Sn:WO heterojunction photoanode from photocorrosion. Our findings show how this novel double heterojunction, established through simple and cost-effective solution-based methods, offers a promising approach to enhancing PEC water splitting applications.
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