Shan Zhichao, Clayton Daniel, Pan Shanlin, Archana Panikar Sathyaseelan, Gupta Arunava
Department of Chemistry, The University of Alabama , Tuscaloosa, Alabama 35487-0336, United States.
J Phys Chem B. 2014 Dec 11;118(49):14037-46. doi: 10.1021/jp504346k. Epub 2014 Jul 22.
We present a model electrode system comprised of nanostructured Ti electrode sensitized with Ag@Ag2S core-shell 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-shell 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-function relationship of the nanostructured Ag@Ag2S NP electrode.
我们展示了一种由用Ag@Ag2S核壳纳米粒子（NPs）敏化的纳米结构Ti电极组成的模型电极系统，用于可见光驱动的光电化学研究。纳米结构的Ti电极涂覆有Ti@TiO2纳米线（NW），以提供高表面积，从而改善光吸收并从Ag@Ag2S NPs高效收集电荷。获得了Ag@Ag2S NPs在可见光下明显的光电化学响应，这归因于Ag2S的可见光敏感性、Ag表面等离子体的局部场增强、Ti@TiO2 NWs增强的电荷收集以及纳米结构电极系统的高表面积的共同作用。可以控制Ag@Ag2S核壳结构的壳厚度和核尺寸，以实现最佳的光电化学性能。应用XPS、XRD、SEM、高分辨率TEM、交流阻抗和其他电化学方法来解析纳米结构Ag@Ag2S NP电极的结构-功能关系。
