题 目：Advanced heterogeneous bimetallic catalyst nanoparticles supported on nitrogen doped graphene for energy applications
报告人： Thomas W?gberg
Associate professor at the Department of Physics, Ume? University
Recent development in the design of advanced bi-metallic nano catalyst represents one of the most promising methods to achieve highly efficient and concurrently cheap catalyst materials for energy applications. Besides the opportunity for technical development the new nanomaterials however also allow the studies of fascinating physical and chemical processes of the nanoparticles as well as understand the role of interface interactions for catalytic processes, such as the oxygen reduction reaction. Here, we present our recent results on various bi-metallic nanocatalysts, both core-shell particles as well as other advanced nanocatalyst. As support for the nanocatalyst, we are using various forms of carbon nanostructures, such as graphene, and ordered mesoporous carbon. However, we also show the effect of doping such carbon nanostructures by nitrogen. Through such doping we show that besides opening for the possibility of having metal free catalyst for oxygen reduction, the presence of nitrogen also significantly changes the substrate properties. In some cases these changes give rise to charge transfer between catalyst nanoparticles and catalyst support which leads to a lowering of the ORR over potential. We discuss results both on synthesis, and structure but the main focus lies on the understanding of the synergy effects between the different metal catalysts in the bi-metallic nanoparticles, as well as synergy effects originating from the catalyst support.
时 间：2014年10月22日（周三） 上午9:30