应甘肃省有色金属化学与资源利用重点实验室、化学化工学院邀请，美国阿克伦大学Steven S. C. Chuang教授来我校进行学术交流并作学术报告，欢迎广大师生参加。
 

报 告 人：Steven S. C. Chuang教授
报告题目：Nitrogen-doped TiO2 for Photocatalytic/Photoelectrochemical Processes
报告时间：2016年5月12日（星期四）15: 00
报告地点：第二化学楼101报告厅
Dr. Steven S. C. Chuang is Professor of Polymer Science and the Director of the FirstEnergy Advanced Energy Research Center at the University of Akron. This center was established in 2009 with the financial support from FirstEnergy Corp. This center is committed to basic research that is needed to develop large scale carbon capture processes and coal-based fuel cells. His research programs focus on (i) developing a fundamental understanding of the reactivity of adsorbed species and its associated sites and (ii) scaling up of catalytic and adsorption processes form the laboratory scale to the pilot scale.  Professor Chuang received his Diploma from National Taipei Inst. of Tech in 1977, MS from New Jersey Inst. of Tech in 1982, and Ph.D. in Chemical Engineering from the University of Pittsburgh in 1985. He served as Chair of Chemical Engineering in 1997-2005 at Akron and mover to Polymer Science in 2011.
Abstract：
Nitrogen (N)-doped TiO2 has been known for its visible light photocatalysis. This presentation will review the current status of N-doped TiO2 photocatalysis and discuss the use of infrared techniques to study the mechanisms of photocatalytic and photoelectrochemcial (PEC) processes. In situ infrared study revealed that a wide range of organic molecules can serve as electron donors; photocatalytic oxidation processes proceed through aldehyde and carboxylate species as reaction intermediates. UV and/or visible light radiation on adsorbed organic molecules on N-doped TiO2 resulted in accumulation of photo-generated electrons, increasing the electronic conductivity of N-doped TiO2. PEC studies revealed H2 and CO2 were the major products from ethanol and cellulose. Use of N-doped TiO2 as a working electrode in dye-sensitized solar cells (DSSCs) showed 15%-20% higher short circuit current and overall efficiency than those with conventional TiO2 electrodes under the standard air mass (AM) 1.5 spectrum (100 mWcm-2). The significant enhanced performance of the DSSC with N-doped TiO2 can be attributed to decreases in electrical impedance of electron transfer and transport in the working electrodes. This presentation will also discuss the factors governing the DSSC performance and approaches for improving its performance.
 

甘肃省有色金属化学与资源利用重点实验室
化学化工学院           
2016年5月9日