Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 20, Pages 10763-10770Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00830
Keywords
photoelectrochemical; hydrogen generation; WO3; Bi2S3; ZnS
Funding
- National Nature Science Foundation of China [51474255]
- Hunan Provincial Natural Science Foundation of China [13JJ6003]
- Fundamental Research Funds for the Central Universities of Central South University [2014zzts015]
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ZnxBi2S3+x sensitized platelike WO3 photoelectrodes on FTO substrates were for the first time prepared via a sequential ionic layer adsorption reaction (SILAR) process. The samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet visible spectrometry (UV-vis), and Raman spectra. The results show that the ZnxBi2S3+x quantum dots (QDs) are uniformly coated on the entire surface of WO3 plates, forming a WO3/ZnxBi2S3+x core/shell structure. The ZnxBi2S3+x/WO3 films show a superior ability to capture visible light. High-efficiency photoelectrochemical (PEC) hydrogen generation is demonstrated using the prepared electrodes as photoanodes in a typical three-electrode electrochemical cell. Compared to the Bi2S3/WO3 photoelectrodes, the ZnxBi2S3+x/WO3 photoelectrodes exhibit good photostability and excellent PEC activity, and the photocurrent density is up to 7.0 mA cm(-2) at -0.1 V versus Ag/AgCl under visible light illumination. Investigation of the electron transport properties of the photoelectrodes shows that the introduction of ZnS enhances the photoelectrons transport rate in the photoelectrode. The high PEC activity demonstrates the potential of the ZnxBi2S3+x/WO3 film as an efficient photoelectrode for hydrogen generation.
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