报告题目：Plasmon-induced photoenergy conversion systems

报 告 人 ：Prof. Hiroaki Misawa

     Hokkaido University, Japan

主 持 人 ：孙洪波 教授

报告时间：2016年8月17日15:00

报告地点：南区唐敖庆楼D区311报告厅

主办单位：电子科学与工程学院

     集成光电子学国家重点联合实验室

     物质科学吉林省高校高端科技创新平台

Abstract: We have demonstrated plasmonic photocurrent generation from visible to near-infrared wave-lengths without deteriorating photoelectric conversion using electrodes in which gold nanorods are elaborately arrayed on the surface of a TiO2 single crystal. We have also reported the stoichiometric evolution of oxygen via water oxidation by irradiating the plasmon-enhanced photocurrent generation system with near-infrared light. In the present study, we developed a plasmon-assisted water splitting system that operates under irradiation by visible light; the system is based on the use of two sides of the same strontium titanate (SrTiO3) single crystal substrate. The water splitting system contains two solution chambers to separate hydrogen (H2) and oxygen (O2), respectively. To promote water splitting, a chemical bias was applied by pH values regulations of those chambers. The quantity of H2 evolved from the surface of platinum, which was used as a reduction co-catalyst, was twice of O2 evolved from an Au nanostructured surface. Thus, the stoichiometric evolution of H2 and O2 was clearly demonstrated. The hydrogen evolution action spectrum closely corresponds to the localized surface plasmon resonance spectrum, indicating that the plasmon-assisted charge separation at the Au/SrTiO3 interface promotes water oxidation and the subsequent reduction of a proton on the backside of the SrTiO3 substrate.

 Hiroaki Misawa is a professor at the Research Institute for Electronic Science at Hokkaido University, Japan. He received his Ph.D. in Chemistry from the University of Tsukuba in1984. After an assistant professorship at the University of Tsukuba, he joined Microphotoconversion project (ERATO) of JST. He became an associate professor at the University of Tokushima in 1993 and was promoted to full professor in 1995. He moved to Hokkaido University as full professor in 2003. Since 2015, he has held an additional post as a chair professor at National Chiao Tung University, Taiwan. He was the representative of around 80 members of a plasmon related project: “Strong Photon-Molecule Coupling Fields for Chemical Reactions”, Grant-in-Aid for Scientific Research on Priority Area, MEXT. He studies plasmonic chemistry.