Abstract
A novel three-dimensional hierarchical WO3 photoelectrode was prepared by solvothermal method, and ZnO was deposited on its surface by electrochemical method. The WO3/ZnWO4/ZnO multiphase-heterojunction photoelectrode was prepared by further annealing treatment to explore the photoinduced cathodic protection (CP) performance. Compared with WO3 and ZnO, the photoinduced CP and electron storage capacity performance of WO3/ZnWO4/ZnO is significantly improved in 3.5% NaCl solution without adding any hole scavenger. The electron storage capacity of the WO3/ZnWO4/ZnO heterojunction makes it possible to continuously protect metallic materials in the dark after switching off the light, which can realize long-term and effective photoinduced CP.
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