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学术报告——Achieving Enhanced Thermoelectric Performance in SnSe2 nanostructures
2018-06-26 16:57   审核人:

 

报告题目:Achieving Enhanced Thermoelectric Performance in SnSe2 nanostructures

报告人:颜清宇  副教授 (新加坡南洋理工大学)

主持人:李祯教授

报告时间:20187316:00

报告地点:公字楼334报告厅

 

Achieving Enhanced Thermoelectric Performance in SnSe2 nanostructures

Yubo Luo, 1 Zhongzhen Luo, 1 Qingyu Yan 1*
1 School of Materials Science and Engineering, Nanyang Technological University
* Corresponding author: alexyan@ntu.edu.sg

Thermoelectric (TE) materials, which can convert heat into electricity and generate temperature gradient for cooling purpose, have been extensively studied for clean and reliable energy harvesting systems. I will discuss some of the progress in my group regarding the development of TE materials including PbTe, carbon based ones. In particular, I will discuss on a defect chemistry approach in SnSe2 nanoplate-based pellets, in which the nanoplates show preferable orientation of the (001) planes along the primary surface of the pellet (in-plane). After simultaneous introduction of Se deficiency and Cl doping, the Fermi level of SnSe2 shifts towards the conduction band, resulting in two orders of magnitude increase in carrier concentration and a transition degenerate transport behavior. In addition, all-scale hierarchical phonon scattering centers, such as point defects, nanograin boundaries, stacking faults and the layered nanostructures cooperate to produce very low lattice thermal conductivity. As a result, an enhanced in-plane ZT value was achieved for 1.5 at% Cl doped SnSe1.95 pellet at 673 K, which is much higher than the corresponding in-plane ZT of pure SnSe2.

Biography

Qingyu Yan is currently an associate professor in School of Materials Science and Engineering in Nanyang Technology University. He obtained his BS in Materials Science and Engineering, Nanjing University. He finished his PhD from Materials Science and Engineering Department of State University of New York at Stony Brook. After that, He joined the Materials Science and Engineering Department of Rensselaer Polytechnic Institute as a postdoctoral research associate. He joined School of Materials Science and Engineering of Nanyang Technological University as an assistant professor in early 2008 and became an associate Professor in 2013.

He is currently the Chair of the Electrochemical Society, Singapore Section. He is a fellow of Royal Society of Chemistry Since 2018. He is the board member of Materials Research Express, (an IOP Journal) since 2016. Yan has published more than 280 papers (with total ciation of >15000 and h index of 64) on two research area: (1) thermoelectric materials; (2) electrochemical properties of nanocrystals.

 

 

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