Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 28, Issue 2, Pages 200-204Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2018.03.004
Keywords
Photoelectrochemistry; Water splitting; Tungsten trioxide photoanode; CuO clusters; Heterojunction
Funding
- National Natural Science Foundation of China [21573068]
- National Natural Science Funds for Distinguished Young Scholar [51725201]
- SRF for ROCS, SEM
- SRFDP
- Fundamental Research Funds for the Central Universities [222201718002]
- Program of Shanghai Subject Chief Scientist [15XD1501300]
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The low quantum efficiency arising from poor charges transfer and insufficient light absorption is one of the critical challenges toward achieving highly efficient water splitting in photoelectrochemical cells. Three dimensions (3D) structures and heterojunctions have received intensive research interests recent years due to their excellent ability to separate photo-generated charges as well as the enhanced light harvesting property. Herein, 3D CuO/WO3 structure was fabricated through a facile solvothermal method followed by chemical bath deposition. The loading of CuO clusters on WO3 nanoflake arrays results in a much improved photocurrent density compared with that of pristine WO3 nanoflake arrays, which reaches 1.8 mA/cm(2) at 1.23 V vs. the reversible hydrogen electrode. The electrochemical impedance spectroscopy measurement demonstrates that the improved performance of CuO/WO3 electrode is attributed to the accelerated charge transfer kinetics as a result of the desirable band alignment in CuO/WO3 heterojunction. This work demonstrates a facile strategy to construct superior WO3 electrode, which will ultimately allow for efficient storage of solar energy into hydrogen.
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