Abstract
We studied plain TiO2 and CdS/TiO2 nanocomposite photoelectrode by testing their photocurrent response in gas phase. The CdS/TiO2 nanocomposite photoelectrode was prepared by the technology of screen printing and the successive ionic layer adsorption and reaction process. In comparison with the plain TiO2 photoelectrode, the CdS/TiO2 nanocomposite photoelectrode showed an extraordinary enhancement on the photocurrent amplitude. Under the irradiation of UV light and under 1, 5, and 10 V bias, respectively, the photocurrent amplitude of CdS/TiO2 nanocomposite photoelectrode was 37, 95, and 151 times higher than that of the plain TiO2. To explain these distinctive phenomenon, we conclude that CdS not only acts as a sensitizer in the CdS/TiO2 nanocomposite, but also acts as a hole capturer. This conclusion was clearly demonstrated by the subsequent reproducible photocurrent response experiments of the on–off cycles of illumination.
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