报告人：焦军 教授

波特兰州立大学

报告时间：2017年10月18日，下午2:30

报告地点：知新楼C座702量子报告厅

邀请人：陈延学

摘要：

Palladium (Pd) is of great interest as a catalyst for water purification for effective at removing volatile organic compounds (VOCs) from water. It is often fabricated in combination with other metals such as gold (Au) over substrates such as aluminum, graphene and granular activated carbon (GAC). We have recently shown that using a green chemistry solvothermal synthesis, it is possible to create a very efficient catalyst of Pd/Au nanoparticles (NPs) over carbon substrates such as GAC and graphene. However, little is understood about the interaction between the substrate and metals during the synthesis. Here, we attempt to explain how the metals bond with the surface of the substrate, and why that makes them more effective than other techniques. The carbon-supported Pd/Au NPs samples were synthesized with variations of parameters such as temperature, time and precursor concentration, and the effects of these on formation of NPs will be discussed. Density functional theory (DFT) calculations were used to simulate a model of graphene and defective graphene (to represent GAC), and their interactions of the metal NPs during synthesis. The study of surface interactions with metallic NPs during deposition has potential to impact several fields, such as in supercapacitors, semi-conductors and device manufacture to name a few.