Effects of Dawson-Type Tungstophosphate on Photoelectrochemical Responses of Cadmium Sulfide Composite Film

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• 作者：Zhixia Sun ; Fengyan Li ; Lin Xu ; Shuping Liu ; Mingliang Zhao ; Bingbing Xu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：March 15, 2012
• 年：2012
• 卷：116
• 期：10
• 页码：6420-6426
• 全文大小：451K
• 年卷期：v.116,no.10(March 15, 2012)
• ISSN：1932-7455

文摘

For exploration of the effects of polyoxometalate on the photoelectrochemical properties of cadmium sulfide (CdS), a composite film of poly(allylamine hydrochloride)-modified CdS (CdS-PAH) and polyoxometalate (K₆P₂W₁₈O₆₂) has been prepared by the layer-by-layer self-assembly method. The thin film was characterized by UV鈥搗is spectroscopy, infrared spectra, X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy. Both photocurrent transient measurement and current鈥搗oltage curves displayed that the photocurrent response and power conversion efficiency of the CdS-PAH/P₂W₁₈ composite film were markedly enhanced in comparison with those of the single CdS-PAH film. Furthermore, CdS-PAH/P₂W₁₈ film exhibited higher photocurrent response intensity than the simple sum of individual components, and polyoxometalate (P₂W₁₈) could act as the photoinduced electron transfer shuttle to efficiently suppress electron鈥揾ole recombination in CdS. Such a mechanism was further proven by experimental data of fluorescence emission spectra and surface photovoltage spectroscopy. These results demonstrated a new strategy to promote the photocurrent response of CdS via the photoinduced electron transfer from the CdS to P₂W₁₈.