Journal
ENERGY TECHNOLOGY
Volume 6, Issue 11, Pages 2247-2255Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201800280
Keywords
Bi2WO6; defects; photoelectrochemistry; water splitting
Categories
Funding
- National Natural Science Foundation of China [51502165, 51702193]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ5035]
- Natural Science Foundation of Education Department of Shaanxi Provincial [16JK1086]
- Scientific Research Fund of Shaanxi University of Science Technology [BJ16-20, BJ16-21]
Ask authors/readers for more resources
Defective Bi2WO6-supported Cu nanoparticles photoelectrocatalyst were successfully synthesized via an etching approach by using NaBH4 as reducing agent. The as-prepared Cu/Bi2WO6-1 was dominated by CuO and Cu and Cu/Bi2WO6-2 was dominated by metallic Cu, confirmed by XPS and TEM analyses. These etching pretreatments also induced the formation of defect sites such as oxygen vacancies and W5+. The presence of oxygen vacancies could significantly increase the photogenerated electrons capture abilities. Metallic Cu nanocrystals on the surface of Bi2WO6 photoanodes are beneficial for the photoresponse range as well as the separation and consumption of photogenerated carriers due to the surface plasmon resonance effect of Cu. Photoelectrochemical studies demonstrated that Cu/Bi2WO6-x exhibited a markedly improved PEC performance in water splitting reaction as compared to that of Bi2WO6 which mainly because of the light harvesting efficiency (eta(abs)) and the interfacial charge transfer efficiency. Importantly, Cu/Bi2WO6-2 exhibited the best PEC activity with a high current density and good stability under neutral conditions, which may be ascribed to the defective Bi2WO6 structure in combination with surface ligand engineering and the synergistic effect of oxygen vacancies and metallic Cu. In addition, the function mechanism of CuO, metallic Cu and oxygen vacancies were discussed in details.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available