5月6日“膜分离与水处理”论坛第30讲预告：Achieving Enhanced Thermoelectric Performance in SnSe2 nanostructures

    报告题目：AchievingEnhanced Thermoelectric Performance in SnSe2nanostructures

报告时间：2018年5月6日（周日）下午2:00

报告地点：假山校区二楼会议室211报告人：新加坡南洋理工大学颜清宇教授

报告人简介：QingyuYan is currently an associate professor in School of Materials Science andEngineering in Nanyang Technology University. He obtained his BS in MaterialsScience and Engineering, Nanjing University. He finished his PhD from MaterialsScience and Engineering Department of State University of New York at StonyBrook. After that, He joined the Materials Science and Engineering Departmentof Rensselaer Polytechnic Institute as a postdoctoral research associate. Hejoined School of Materials Science and Engineering of Nanyang TechnologicalUniversity as an assistant professor in early 2008 and became an associateProfessor in 2013. He is the board member of Materials Research Express, (anIOP Journal) since 2016. Yan haspublished bbin电子 than 250 papers on two research area: (1) thermoelectricmaterials; (2) electrochemical properties of nanocrystals, with a totalcitation of 14757 and a h-Index of 62.

报告内容简述：Thermoelectric (TE) materials, which can convert heat intoelectricity and generate temperature gradient for cooling purpose, have beenextensively studied for clean and reliable energy harvesting systems.I will discuss some of the progress in my group regarding thedevleopment of TE materials including PbTe, carbon based ones. In particular, Iwill discuss ona defect chemistry approach in SnSe2nanoplate-based pellets, in which the nanoplates show preferable orientation ofthe (001) planes along the primary surface of the pellet (in-plane).After simultaneous introduction of Se deficiency andCl doping, the Fermi level of SnSe2shifts towards the conductionband, resulting in two orders of magnitude increase in carrier concentrationand a transition degenerate transport behaviour. In addition, all-scalehierarchical phonon scattering centres, such as point defects, nanograinboundaries, stacking faults and the layered nanostructures cooperate to producevery low lattice thermal conductivity. As a result, an enhanced in-plane ZTmaxof 0.63 was achieved for 1.5 at% Cl doped SnSe1.95pellet at673 K, which is much higher than the corresponding in-plane ZT of pure SnSe2(0.08).