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首页> 外文期刊>Energy & environmental science >High thermoelectric conversion efficiency of MgAgSb-based material with hot-pressed contacts
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High thermoelectric conversion efficiency of MgAgSb-based material with hot-pressed contacts

机译：具有热压触点的MgAgSb基材料的高热电转换效率

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摘要

The efficiency of heat-to-electricity conversion based on the thermoelectric effect depends on the materials' nondimensional figure of merit zT. While recent years saw an increasing number of reports of large peak zT in thermoelectric materials, efficiency data are scarce. High conversion efficiency requires not only a large average zT in the operational temperature range, but also good electrical and thermal contacts to the material. In this work, we experimentally demonstrate a record high thermoelectric conversion efficiency of 8.5% with a single thermoelectric leg based on a recently reported p-type MgAgSb-based compound operating between 20 and 245 degrees C. The efficiency can exceed 10% by increasing the hot side temperature to 295 degrees C. The sample is fabricated with silver contact pads using a one-step hot-press technique eliminating a typically required sample metallization process. This significantly simplifies the fabrication of thermoelectric elements with low electrical and thermal contact resistances.
机译：基于热电效应的热电转换效率取决于材料的无量纲品质因数zT。尽管近年来有越来越多的热电材料峰值zT的报告，但效率数据却很少。高转换效率不仅要求在工作温度范围内具有较大的平均zT，而且还要求与材料的良好电接触和热接触。在这项工作中，我们通过实验证明，基于最近报道的在20至245摄氏度之间运行的p型基于MgAgSb的化合物，单个热电腿的热电转换效率达到创纪录的8.5％。热侧温度达到295摄氏度。使用一步接触热压技术，使用银制接触垫制造样品，从而消除了通常所需的样品金属化过程。这极大地简化了具有低电和热接触电阻的热电元件的制造。

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  • 来源
    《Energy & environmental science》 |2015年第4期|1299-1308|共10页
  • 作者

    Kraemer D.; Sui J.; McEnaney K.; Zhao H.; Jie Q.; Ren Z. F.; Chen G.;

  • 作者单位

    MIT, Dept Mech Engn, Cambridge, MA 02139 USA;

    Univ Houston, Dept Phys, Houston, TX 77204 USA|Univ Houston, TcSUH, Houston, TX 77204 USA|Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China;

    MIT, Dept Mech Engn, Cambridge, MA 02139 USA;

    Univ Houston, Dept Phys, Houston, TX 77204 USA|Univ Houston, TcSUH, Houston, TX 77204 USA|Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China;

    Univ Houston, Dept Phys, Houston, TX 77204 USA|Univ Houston, TcSUH, Houston, TX 77204 USA;

    Univ Houston, Dept Phys, Houston, TX 77204 USA|Univ Houston, TcSUH, Houston, TX 77204 USA;

    MIT, Dept Mech Engn, Cambridge, MA 02139 USA;

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