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.

 

 

       讲座人介绍：

       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.

      

       E-mail: wanglei8@stanford.edu