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Self-Improvement of Ti:Fe2O3 Photoanodes: Photoelectrocatalysis Improvement after Long-Term Stability Testing in Alkaline Electrolyte

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journal contribution
posted on 22.05.2018, 00:00 authored by Jiale Xie, Pingping Yang, Xiaorong Liang, Jinyun Xiong
Hematite photoanode is a widely accepted stable photoelectrode in a strong alkali solution, such as NaOH aqueous solution. However, no one systematically investigates the photoelectrochemical stability of hematite-based photoanodes. More importantly, there are some contradictory results about the stability of hematite photoanodes in the literature. Herein we investigate the long-term stability of a Ti doped hematite (Ti:Fe2O3) photoanode in 1.0 M NaOH under visible light. Ti:Fe2O3 photoanode exhibits the significant photocurrent enhancement and the cathodic shift of the onset potential after long-term working in a strong alkali solution. Detailed characterizations reveal that an FeOOH layer, which serves as cocatalyst for self-improvement of Ti:Fe2O3 photoanodes, is formed at the interface of the Ti:Fe2O3/electrolyte junction.

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