联系我们  |  网站地图  |  English   |  移动版  |  中国科学院 |ARP
站内搜索:
首页 简介 管理部门 科研部门 支撑部门 研究队伍 科研成果 成果转化 研究生教育 党建与创新文化 科普 信息公开 办公内网
学术活动
上海硅酸盐所-大连化物所...
First-principles study o...
高级建筑门窗研究的最新进展
人工晶体中心学术讲坛(第...
Near-Field Thermal Radia...
荧光粉红色发光性能调控和...
面向半导体照明与生物成像...
Ultrafast laser plasma d...
Computational Catalysis ...
Electron work function ...
Wearable Thermoelectric ...
New Trends for Optical C...
铋离子激活新型发光材料的...
Building the Next Genera...
上海MGI研究院“材料信息...
现在位置:首页>新闻动态>学术活动
The Thermoelectric Energy Conversion:Copper Chalcogenides with extremely Low Thermal Conductivity and Magnesium Silicides with High Thermoelectric Performance
2016-10-27 13:21:13 | 编辑: | 【 【打印】【关闭】

SEMINAR 

The State Key Lab of 

High Performance Ceramics and Superfine Microstructure 

Shanghai Institute of Ceramics, Chinese Academy of Sciences 

中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室 
 
 

  The Thermoelectric Energy Conversion: Copper Chalcogenides with extremely Low Thermal Conductivity and Magnesium Silicides with High Thermoelectric Performance
Holger Kleinke
Department of Chemistry and Waterloo Institute for Nanotechnology, 

University of Waterloo, Ontario, Canada  

    

  时间:20161031日(星期一)上午10: 00 

  地点: 2号楼600会议室(国家重点实验室)    

  欢迎广大科研人员和研究生参与讨论! 

联系人:史  迅(2803 

  Abstract  

  Thermoelectric materials can convert waste heat into electricity, and are thus of increasing importance in today's society, given the growing need for alternative energy sources. Many advanced thermoelectric materials are based on narrow gap semiconductors formed by heavily doped heavy metal chalcogenides including thallium, bismuth, and lead tellurides.  

  An alternate route to low thermal conductivity may lie in cation mobility, such as mobile copper ions. This was demonstrated in case of Cu2–xSe, which exhibits very low thermal conductivity, culminating in a high figure-of-merit zT value of 1.5 at 1000 K. The Cu ion conductivity, on the other hand, causes well-documented stability issues, inhibiting the use of this material in actual thermoelectric devices, as the ions move with the temperature gradient and/or the current. We have been investigating new barium copper chalcogenides for several years, aiming to find materials with localized Cu ion conductivity, where the 6th period barium ions would impede the Cu paths as well as contribute to low thermal conductivity. Here, I will present the thermoelectric properties of two families of barium copper chalcogenides, both with low thermal conductivity and good thermoelectric performance. The stability under measurement conditions will be discussed in connection with the Cu diffusion paths.  

  Problematic with the materials above are price and toxicity, in part but not exclusively caused by the incorporation of the scarce and toxic element tellurium. More sustainable materials exist, but until recently were not competitive with respect to the conversion efficiency. Variants of Mg2Si were reported to exceed zT of unity around 800 K, when alloyed with germanium and/or tin, and doped with antimony or bismuth, and finally consolidated via spark-plasma-sintering. In this talk, I will present several such materials with a large compositional range that were simply prepared by hot-pressing.     

  Brief Introduction of Prof. Holger Kleinke 

  Interim Executive Director of the Waterloo Institute for Nanotechnology 

  Professor for Chemistry and Physics at Department of Chemistry and Waterloo Institute for Nanotechnology 

  Education 

  1994    Ph. D. in Chemistry, University of Mainz, Germany 

  1991    M. Sc. in Chemistry, University of Münster, Germany 

  Academic appointments 

  2016-   Interim Executive Director, Waterloo Institute for Nanotechnology  

  2000-   Assistant, Associate, and Full Professor of Chemistry, University of Waterloo 

  1997-1999  Habilitant, University of Marburg, Germany 

  1995-1997  Postdoctoral Researcher, Ames Laboratory, US-DOE 

  Awards  and  Honors 

  2002-2011  Canada Research Chair in Solid State Chemistry (Tier 2) 

  2000   Premier's Research Excellence Award 

  1997-1999  Liebig Fellow, University of Marburg, Germany 

版权所有 中国科学院上海硅酸盐研究所 沪ICP备05005480号
长宁园区地址:上海市长宁区定西路1295号 电话:86-21-52412990 传真:86-21-52413903 邮编:200050
嘉定园区地址:上海市嘉定区和硕路585号  电话:86-21-69906002 传真:86-21-69906700 邮编:201899