Visible Light Driven Photoelectrochemical Properties of Ti@TiO2 Nanowire Electrodes Sensitized with Core鈥揝hell Ag@Ag2S Nanoparticles

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• 作者：Zhichao Shan ; Daniel Clayton ; Shanlin Pan ; Panikar Sathyaseelan Archana ; Arunava Gupta
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：118
• 期：49
• 页码：14037-14046
• 全文大小：633K
• ISSN：1520-5207

文摘

We present a model electrode system comprised of nanostructured Ti electrode sensitized with Ag@Ag₂S core鈥搒hell nanoparticles (NPs) for visible light driven photoelectrochemistry studies. The nanostructured Ti electrode is coated with Ti@TiO₂ nanowires (NW) to provide a high surface area for improved light absorption and efficient charge collection from the Ag@Ag₂S NPs. Pronounced photoelectrochemical responses of Ag@Ag₂S NPs under visible light were obtained and attributed to collective contributions of visible light sensitivity of Ag₂S, the local field enhancement of Ag surface plasmon, enhanced charge collection by Ti@TiO₂ NWs, and the high surface area of the nanostructured electrode system. The shell thickness and core size of the Ag@Ag₂S core鈥搒hell structure can be controlled to achieve optimal photoelectrochemical performance. XPS, XRD, SEM, high resolution TEM, AC impedance, and other electrochemical methods are applied to resolve the structure鈥揻unction relationship of the nanostructured Ag@Ag₂S NP electrode.