高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (8): 2493.doi: 10.7503/cjcu20210212

• 物理化学 • 上一篇    下一篇

新型S型CdS-BiVO4异质结光电极的构筑及产氢性能研究

薛晋波1(), 高国翔1,2, 申倩倩1, 刘天武1,2, 刘旭光1,2, 贾虎生1,2   

  1. 1.太原理工大学新材料界面科学与工程教育部重点实验室
    2.材料科学与工程学院, 太原 030024
  • 收稿日期:2021-03-29 出版日期:2021-08-10 发布日期:2021-08-05
  • 通讯作者: 薛晋波 E-mail:xuejinbo@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(62004137);山西省自然科学基金(201701D221083);山西省重点研发计划项目(201803D421079);山西省高等学校科技创新项目(2019L0156);山西省回国留学人员科研资助项目(2020-050)

Construction of a Novel S-scheme CdS-BiVO4 Heterojunction Photoelectrodes and Research on Hydrogen Production

XUE Jinbo1(), GAO Guoxiang1,2, SHEN Qianqian1, LIU Tianwu1,2, LIU Xuguang1,2, JIA Husheng1,2   

  1. 1.Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education
    2.College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2021-03-29 Online:2021-08-10 Published:2021-08-05
  • Contact: XUE Jinbo E-mail:xuejinbo@tyut.edu.cn

摘要:

通过化学浴和连续离子层沉积法构筑了BiVO4/CdS和CdS/BiVO4两种S型异质结薄膜光电极. 利用扫描电子显微镜(SEM)、 X射线衍射(XRD)、 紫外-可见吸收光谱(UV-Vis)以及电化学阻抗谱(EIS)对其形貌、 结构和光电性能进行了表征, 测试了两种薄膜电极的光催化和光电催化产氢性能. 结果表明, CdS和BiVO4之间形成S型异质结, BiVO4/CdS表现出最佳的光催化产氢性能, 而CdS/BiVO4表现出最佳的光电催化产氢性能. 借助表面光电压技术探究了两种薄膜电极中S型异质结内建电场的形成过程和载流子传输的机制.

关键词: S型异质结, 光电极, 内建电场, 产氢

Abstract:

The single component photocatalysts have low photocatalytic hydrogen production efficiency due to the serious recombination of photogenerated electrons and holes and the mismatch of redox capacity and light absorption range. CdS/BiVO4 and BiVO4/CdS S-scheme heterojunction film photoelectrodes were prepared via chemical bath deposition and successive ionic layer adsorption and reaction method, respectively. The morphology, structure, optical and photoelectrochemical properties of the two film electrodes were characte-rized by scanning electron microscopy(SEM), X-ray diffraction(XRD), ultraviolet-visible(UV-Vis) spectro-scopy, and electrochemical impedance spectroscopy(EIS), and the photocatalytic and photoelectrocatalytic hydrogen production properties of the two film electrodes were tested. The results show that S-scheme heterojunction formed between CdS and BiVO4, BiVO4/CdS shows the best photocatalytic hydrogen production performance, while CdS/BiVO4 shows the best photoelectrocatalytic hydrogen production performance. With the help of surface photovoltage technology, the formation process of the built-in electric field and the carrier transport mechanism of S-scheme heterojunction in the two film electrodes are explored.

Key words: S-scheme heterojunction, Photoelectrode, Internal electric field, Hydrogen production

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