学术动态
夏振海教授学术报告会通知
2012-06-25 15:45   审核人:

报告题目:Multi-doped Graphene and its Application in Clean Energy Conversion and Storage

报告人:Zhenhai Xia, Department of Materials Science and Engineering, University of North Texas

主持人:杨延清 教授

地  点:公字楼328

报告时间:2012626日下午4:00-6:00

 报告内容简介:A critical issue in the development of renewable energy production and storage technologies isthe discovery of efficient and cost-effective catalysts for use in electrochemical energy conversion processes such as the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), both of which are central to the efficiencies of direct-solar and electrolytic water-splitting devices, fuel cells and metal–air batteries. Doped carbon nanomaterials are attractive in principle for catalytic applications because their unique molecular structure facilitates the four-electron ORR. In addition, there are even more appeals because of their extreme flexibility, the large surface area, excellent mechanical and electrical properties, and highly stability in the extreme environment. A fundamental understanding of carbon-based catalyst design principle that links material structures to the catalytic activity can accelerate the search for highly active and abundant metal-free catalysts to replace platinum. In this talk, we present our recent work on nitrogen, boron and other element-doped graphene for catalytic application in fuel cells. We demonstrate that the catalytic activity primarily correlates to charge and spin densities of the graphene. The doping and defects introduce high positive spin and/or charge densities that facilitate the ORR on graphene surface. The identified active sites are closely related to doping cluster size and dopant-defect interactions. For four-electron transfer, the effective reversible potential ranges from 1.07~1.15 V/SHE, depending on the defects and cluster size. The catalytic properties of graphene could be optimized by introducing small doping clusters in combination with material defects.

Close Window
推荐文章
热点文章
友情链接:

CopyRight (c)   2016-2017   通讯地址:陕西省西安市友谊西路127号西北工业大学材料学院 邮编:710072 版权所有:西北工业大学材料学院 技术支持:赵有国