应实验室Lionel Vayssieres教授邀请，斯坦福大学化学工程系Lei Wang访问实验室可再生能源研究中心，并为实验室师生开展学生讲座，请实验室师生积极参加交流。
讲座题目：Gold Nanoparticle Decorated Fe2O3 Photoelectrodes: Understanding their Limitations and Challenges for an Improvement of Photoelectrochemical Efficiency
Hematite photoelectrodes combined with metallic nanoparticles has been extensively explored to produce hydrogen via photoelectrochemical process. Although some advances were achieved, unfavorable effect of metallic nanostructures on the photochemical response have been observed. In this sense, the present work related to the presence of gold nanoparticle (AuNP) on hematite surface and its implication in the overall photocatalytic mechanism. In order to elucidate some mistaken plasmonic phenomena, a series of photoelectrodes synthesized using microwave conditions and decorated with AuNPs from 3 to 10 nm in diameter by dip coating were proposed. The analyses showed the formation of hydrated gold phase (Au(OH)3) when the photoelectrodes were in contact with electrolyte (reaction medium saturated of OH- species) and were irradiated, which is a limiting factor in photoelectrochemical applications.
Lei Wang has been K&A Wallenberg Postdoc scholar since year 2016 at Stanford University, working in the group of Prof. Thomas Jaramillo at the Department of Chemical Engineering. He received his Ph.D. from the School of Chemical Science at KTH Royal Institute of Technology, at the end of year 2015. His research experiences and interests lie in electrochemical related catalysis and materials discovery for sustainable energy and green organic synthesize technologies.