Abstract
To improve photoelectrocatalytic (PEC) efficiency, ZnO/WO 3 nanocomposite film electrodes were prepared using screen printing technology. The results obtained from XRD and UV–vis diffuse reflection absorption spectra confirmed that a new ZnWO 4 phase was formed in the composites. The existence of ZnWO 4 introduced a type of ZnO/ZnWO 4/WO 3 double heterojunction into the composites, which was verified by high-resolution transmission electron microscopy. The PEC efficiencies of the composites on the decomposition of methyl orange were tested. Composites with 40–50 wt% WO 3 had the higher PEC efficiency than other samples. This phenomenon was attributed to two factors, specifically, the function of heterojunctions and the function of grains in the composites. The functions of grains in the composites are discussed, as well as the roles of ZnO/WO 3 heterojunctions and ZnO/ZnWO 4/WO 3 double heterojunctions.
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