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Oxygen-Deficient Nanofiber WO3–x/WO3 Homojunction Photoanodes Synthesized via a Novel Metal Self-Reducing Method

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journal contribution
posted on 15.10.2019, 19:34 by Faqi Zhan, Yang Liu, Keke Wang, Xuetao Yang, Min Liu, Xiaoqing Qiu, Jie Li, Wenzhang Li
Defect engineering of semiconductors has been identified as an efficient route toward enhancing the photoelectrochemical performances. There is a security threat in the traditional hydrogen annealing process. In this work, the oxygen-defective nanofiber WO3–x/WO3 homojunction photoanode was in situ-synthesized via a novel metal self-reducing method. The as-prepared photoanode exhibits 1.8 times higher solar water oxidation photocurrent density than that of the bare WO3 film at 1.2 V versus Ag/AgCl. The enhanced photoelectrochemical properties originate from the effective charge separation and injection, attributed to the stronger built-in electric field created by the oxygen-deficient homojunction. Importantly, this novel method is universally applicable to synthesize oxygen-deficient semiconductor materials, including films and powders.