Complete Characterization of Thermoelectric Materials by Impedance Spectroscopy
Complete Characterization of Thermoelectric Materials by Impedance Spectroscopy
复制标题
通过阻抗谱完整表征热电材料
DOI：
10.1021/acs.jpcc.9b02131
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Beltrán-Pitarch B
中科院分区：
文献类型：
--
作者：
Beltrán-Pitarch B
热电材料可以直接将余热转化为电能。由于在我们的社会中有大量的能源作为废热，这些材料可以有助于减少我们对化石燃料的依赖以及与之相关的环境问题。然而，热电材料的热电转换效率仍然是一个限制因素，人们正在进行广泛的努力来提高其性能。寻找更高效的材料主要集中在三个性能（塞贝克系数、电阻率和导热系数）的优化上。通常，这些都是通过在两个或多个仪器上的独立测量来确定为温度的函数，这使得热电表征繁琐且耗时，这使得实现更有效的热电能量转换变得复杂。在这里，首次证明了材料的完整热电特性可以通过使用阻抗谱方法在一台仪器上进行的单次电测量来实现。在演示中使用了一个角钢矿样品，它被夹在两个不锈钢触点之间，以四探针的方式排列，它们的性能在50到250°C之间被测定。这种新方法显示出良好的精度，并与商用设备对相同样品的表征一致，说明了该技术在促进热电材料快速有效评估方面的力量。
Thermoelectric materials can directly convert waste heat into electricity. Because of the vast amount of energy available as waste heat in our society, these materials could contribute to reduce our dependence on fossil fuels and their associated environmental problems. However, the heat to electricity conversion efficiency of thermoelectric materials is still a limiting factor, and extensive efforts are being undertaken to improve their performance. The search for more efficient materials is focused on the optimization of three properties (Seebeck coefficient, electrical resistivity, and thermal conductivity). Typically, these are determined as a function of temperature through independent measurements on two or more instruments, making thermoelectric characterization tedious and time consuming, which complicates the attainment of more efficient heat to electricity energy conversion. Here, it is demonstrated for the first time that complete thermoelectric characterization of a material may be achieved from single electrical measurement performed on one instrument only by employing the impedance spectroscopy method. A skutterudite sample is used for the demonstration, which is sandwiched between two stainless steel contacts in a four-probe arrangement and their properties are determined from 50 to 250 °C. This new approach shows good precision and agrees with characterization of the same sample performed with commercial equipment, illustrating the power of the technique to facilitate the rapid and efficient evaluation of thermoelectric materials.
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影响因子：
6.4
作者：
Prado-Gonjal, Jesus;Phillips, Matthew;Powell, Anthony V.
通讯作者：
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影响因子：
11.2
作者：
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通讯作者：
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塞贝克系数计量：当代协议是否符合标准？
影响因子：
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作者：
Joshua Martin;W. Wong;Martin L. Green
通讯作者：
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DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
U. Stohrer
通讯作者：
U. Stohrer