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A Dual-Heterojunction Cu2O/CdS/ZnO Nanotube Array Photoanode for Highly Efficient Photoelectrochemical Solar-Driven Hydrogen Production with 2.8% Efficiency

  • Na Chen
    Na Chen
    School of Science, Minzu University of China, Beijing 100081, China
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  • Yiwen Hu
    Yiwen Hu
    School of Science, Minzu University of China, Beijing 100081, China
    More by Yiwen Hu
  • Xuyi Liu
    Xuyi Liu
    School of Science, Minzu University of China, Beijing 100081, China
    More by Xuyi Liu
  • Jue Yang
    Jue Yang
    School of Science, Minzu University of China, Beijing 100081, China
    More by Jue Yang
  • Wenrui Li
    Wenrui Li
    School of Science, Minzu University of China, Beijing 100081, China
    More by Wenrui Li
  • Donghai Lu
    Donghai Lu
    School of Science, Minzu University of China, Beijing 100081, China
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  • Junli Fu
    Junli Fu
    School of Science, Minzu University of China, Beijing 100081, China
    More by Junli Fu
  • Yujie Liang*
    Yujie Liang
    School of Science, Minzu University of China, Beijing 100081, China
    *Email: [email protected]
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  • , and 
  • Wenzhong Wang
    Wenzhong Wang
    School of Science, Minzu University of China, Beijing 100081, China
Cite this: J. Phys. Chem. C 2020, 124, 40, 21968–21977
Publication Date (Web):September 11, 2020
https://doi.org/10.1021/acs.jpcc.0c06045
Copyright © 2020 American Chemical Society
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Abstract

We report a Cu2O/CdS/ZnO photoanode constructed by coupling Cu2O and CdS nanoparticles on ZnO nanotube arrays (NTAs) via combining chemical bath deposition with successive ionic-layer adsorption and reaction. Integrating the merits of the superior ability of Cu2O and CdS to harvest visible light, dual heterojunctions, type-II band structure, a p-n junction, and ordered tubular structure, the photoanode exhibits simultaneous significant improvements in the visible light absorption, charge separation, hydrogen generation, and stability. At 0.4 V versus Ag/AgCl under AM 1.5 G irradiation, the photoanode achieves a photocurrent density of 7 mA/cm2, which is 2.3-fold higher than that of CdS/ZnO heterojunction NTAs. Furthermore, under AM 1.5 G illumination without bias potential, the photoanode achieves an average hydrogen generation rate of 134 μmol/h, which is 1.5 times that of single-heterojunction CdS/ZnO NTAs. The highest solar-to-hydrogen conversion efficiency of the Cu2O/CdS/ZnO photoanode is 2.8% at 0.6 V vs. RHE, 1.6 times that of the CdS/ZnO NTAs.

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