时间：10月23日上午9:30-11:30
地点：环境资源楼报告厅
学术报告1
报告人：Prof. Moonsub Shim
Associate Professor and Willett Faculty Scholar
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign
报告题目：Nano-Heterostructures for Photovoltaics and Optoelectronics
报告时间：2013年10月23日上午9:30-10:30
学术报告2
报告人：Dr. Congjun Wang
Senior Materials Scientist
U.S. Department of Energy National Energy Technology Laboratory
报告题目：Heterostructured Catalysts for Visible Light CO2 Conversion
报告时间：2013年10月23日上午10:30-11:30
邀请人：化学与材料科学学院、合肥微尺度物质科学国家实验室熊宇杰教授 0551-63606657；yjxiong@ustc.edu.cn
Nano-Heterostructures for Photovoltaics and Optoelectronics
Moonsub Shim
Associate Professor and Willett Faculty Scholar
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign
Understanding charge separation and recombination processes and developing materials that can efficiently direct charge carriers with nanoscale precision are of fundamental importance in advancing next-generation electronics, optoelectronics and energy technologies. In particular, low-dimensional materials with their inherent shape anisotropy provide promising platforms. In this talk, I will discuss type II staggered band offset semiconductor nanorod heterostructures and p-n junctions in graphene/CNTs interfaced with ferroelectric oxides as examples. Challenges in materials synthesis/fabrication (e.g., efficient doping with spatial modulation and structurally/chemically well-defined structures), unusual properties and prospects arising from the formation of heterointerfaces, and our efforts to integrate these materials into photovoltaics and light-emitting diodes will be presented.
Moonsub Shim received his B.S. degree in chemistry from the University of California at Berkeley in 1997 and his M.S. and Ph.D. degrees, also in chemistry, from the University of Chicago in 1998 and 2001, respectively. After working as a postdoctoral researcher at Stanford University, he joined the faculty of the Department of Materials Science and Engineering at the University of Illinois in 2002. Recognitions for his achievements include the Xerox Award for Faculty Research (2007), National Science Foundation CAREER Award (2004) and Racheff Assistant Professorship (2002–2004). He is currently a Willett Faculty Scholar at the University of Illinois.
Heterostructured Catalysts for Visible Light CO2 Conversion
Congjun Wang
Senior Materials Scientist
U.S. Department of Energy National Energy Technology Laboratory
As the evidence of global climate change becomes ubiquitous and the resulting environmental impact is increasingly severe, there is a pressing need to mitigate the negative effects of fossil energy consumption, of which CO2 emission is the major concern. Photocatalytic reduction of CO2 offers a promising solution because it not only reduces the amount of CO2 released to the atmosphere, but also converts the green house gas into useful chemicals and fuels, such as methane, CO, methanol, etc. Despite the great promise of this approach, the artificial photocatalytic CO2 reduction is highly inefficient and impractical. One of the challenges is that metal oxide based photocatalysts are incapable of utilizing visible and near infrared photons for photocatalysis. We have developed various heterostructured catalysts which exploit the attractive optical properties of semiconductor and metal nanocrystals to sensitize wide band-gap metal oxide catalysts. These heterostructured catalysts have shown CO2 reduction activity deep into the red tails of the visible spectral region. Mechanisms of different types of heterostructured catalysts will be discussed. Our most recent effort in developing methods for utilizing plasmon-assisted catalysts for CO2 conversion applications will also be described.
Congjun Wang received his B.S. degree from Nanjing University. He then completed his Ph.D. in chemistry at the University of Chicago followed by a post-doc position at the University of Illinois at Urbana-Champaign. He is currently a Senior Materials Scientist with URS Corporation and the U.S. Department of Energy National Energy Technology Laboratory. He is the author or co-author of ~30 publications and book chapters and is the co-inventor of 4 U.S. patents and patent applications. He was the recipient of the Graduate Student Gold Award from the Materials Research Society and the Yang Cao-Lan-Xian Best Thesis Award in Chemistry from the University of Chicago.