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Unveiling the activity and stability of BiVO4 photoanodes with cocatalyst for water oxidation

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  • Tian, Tian
  • Jiang, Guiyuan
  • Li, Yunlu
  • Xiang, Wenjing
  • Fu, Wensheng

Abstract

Developing low-cost and efficient cocatalyst is highly desirable for photoelectrochemical (PEC) water oxidation. FeOOH is one of the most typical cocatalysts, the active sites of FeOOH in PEC remain unclear. Herein, the FeOOH was deposited on BiVO4 photoanodes through electrodeposition. A series of experimental evidence shows that the Bi–O–Fe bond is beneficial to the improvement of water oxidation activity, while the FeOOH can not restrain the dissolution of V5+ and improve the stability of the photoelectrode. In order to further improve the activity and stability of BiVO4/FeOOH photoanode, a low-cost metal-organic coordination composed of tannic acid coordinated with Ni ions (TANi) was assembled on the BiVO4/FeOOH (denoted as BiVO4/FeOOH/TANi). Under AM 1.5 G illumination, an impressive current density of 4.6 mA cm−2 (1.23 V vs. RHE) was obtained for BiVO4/FeOOH/TANi photoanode. Systematic studies reveal that the enhanced PEC activity comes from the protection of BiVO4 and enhancement of charge separation efficiency. This work provides a strategy for designing cocatalysts to construct efficient and stable PEC water oxidation.

Suggested Citation

  • Tian, Tian & Jiang, Guiyuan & Li, Yunlu & Xiang, Wenjing & Fu, Wensheng, 2022. "Unveiling the activity and stability of BiVO4 photoanodes with cocatalyst for water oxidation," Renewable Energy, Elsevier, vol. 199(C), pages 132-139.
    • Handle: RePEc:eee:renene:v:199:y:2022:i:c:p:132-139
    DOI: 10.1016/j.renene.2022.08.138
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    References listed on IDEAS

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    1. Fatwa F. Abdi & Lihao Han & Arno H. M. Smets & Miro Zeman & Bernard Dam & Roel van de Krol, 2013. "Efficient solar water splitting by enhanced charge separation in a bismuth vanadate-silicon tandem photoelectrode," Nature Communications, Nature, vol. 4(1), pages 1-7, October.
    2. Xinjian Shi & Il Yong Choi & Kan Zhang & Jeong Kwon & Dong Yeong Kim & Ja Kyung Lee & Sang Ho Oh & Jong Kyu Kim & Jong Hyeok Park, 2014. "Efficient photoelectrochemical hydrogen production from bismuth vanadate-decorated tungsten trioxide helix nanostructures," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
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