Positive potential pretreatment of TiO2 photoanode towards efficient charge separation

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2024-08-05 DOI:10.1016/j.apcata.2024.119904

Li Zou , Jiale Xie , Shuxiang Wang , Yixing Yu , Jing Huang , Liuliu Wang , Pingping Yang , Wenyan Tao

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Abstract

Low charge separation efficiency (η_sep) of TiO₂ impedes its applications of photoelectrochemical (PEC) water splitting. A positive potential pretreatment approach has been developed to construct a surface polarization with −OH groups at a potential of 1.48 V_RHE. When the pretreatment time of 6 h is used, the η_sep and photocurrent density (J_ph) reach up to 54 % (vs. 24 %, TiO₂) and 0.92 mA cm⁻² (vs. 0.32 mA cm⁻², TiO₂) under AM 1.5 G illumination, respectively. The photovoltage can be increased from 0.17 V to 0.52 V. When the pretreatment time is extended to 22 h, a higher J_ph of 1.57 mA cm⁻² and η_sep of 87 % can be obtained. Furthermore, the positive potential pretreated TiO₂ possesses excellent PEC stability. The PEC improvements can be attributed to the surface polarization with the −OH groups and favorable surface states of Ti-OH, but not to the formation of Ti³⁺ or oxygen vacancies.

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正电位预处理二氧化钛光阳极，实现高效电荷分离

二氧化钛的电荷分离效率（ηsep）较低，阻碍了其在光电化学（PEC）水分离方面的应用。我们开发了一种正电位预处理方法，在 1.48 VRHE 的电位下构建带有 -OH 基团的表面极化。当预处理时间为 6 小时时，在 AM 1.5 G 光照下，ηsep 和光电流密度 (Jph) 分别达到 54 %（TiO2 为 24 %）和 0.92 mA cm-2（TiO2 为 0.32 mA cm-2）。光电压可从 0.17 V 提高到 0.52 V。当预处理时间延长至 22 h 时，可获得更高的 Jph（1.57 mA cm-2）和 87 % 的 ηsep。此外，经过正电位预处理的二氧化钛具有出色的 PEC 稳定性。PEC 的改善可归因于 -OH 基团的表面极化和 Ti-OH 的有利表面状态，而不是 Ti3+ 或氧空位的形成。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.