期刊
JOURNAL OF POWER SOURCES
卷 325, 期 -, 页码 591-597出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.079
关键词
Tungsten oxide plates; CdS hollow sphere; In situ conversion; Photoelectrochemical activity
资金
- National High Technology Research and Development Program of China [2011AA050528]
- National Nature Science Foundation of China [51304253]
CdS/CdWO4/WO3 heterojunction films on fluorine-doped tin oxide (FTO) substrates are for the first time prepared as an efficient photoanode for photoelectrochemical (PEC) hydrogen generation by an in situ conversion process. The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet visible spectrometry (UV-vis) and X-ray photoelectron spectroscopy (XPS). The CdS hollow spheres (similar to 80 nm) sensitized WO3 plate film with a CdWO4 buffer-layer exhibits increased visible light absorption and a significantly improved photoelectrochemical performance. The photocurrent density at 0 V (vs. Ag/AgCl) of the CdS/CdWO4/WO3 anode is similar to 3 times higher than that of the CdWO4/WO3 anode, and similar to 9 times higher than that of pure WO3 under illumination. The highest incident-photon-to-current-efficiency (IPCE) value increased from 16% to 63% when the ternary heterojunction was formed. This study demonstrates that the synthesis of ternary composite photocatalysts by the in situ conversion process may be a promising approach to achieve high photoelectric conversion efficiency. (C) 2016 Elsevier B.V. All rights reserved.
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