N-Type Bismuth Telluride Nanocomposite Materials Optimization for Thermoelectric Generators in Wearable Applications
N-Type Bismuth Telluride Nanocomposite Materials Optimization for Thermoelectric Generators in Wearable Applications
复制标题
DOI：
10.3390/ma12091529
复制
发表时间：
2019-05-01
期刊：
影响因子：
3.4
通讯作者：
Vashaee, Daryoosh
中科院分区：
文献类型：
--
作者：
Nozariasbmarz, Amin;Krasinski, Jerzy S.;Vashaee, Daryoosh
热电材料可能在未来的可穿戴电子设备中发挥关键作用。它们可以不断地从体热中产生电力。为了在可穿戴系统中高效运行，除了具有高热电系数zT外，热电材料还必须具有低导热系数和高塞贝克系数。在这项研究中，我们成功地合成了n型Bi2Te2.7Se0.3的高性能纳米复合材料，专门针对人体集热和发电应用进行了优化。采用掺杂优化、玻璃包合、单模微波腔微波辐射、烧结条件等技术对Bi2Te2.7Se0.3的温敏热电性能进行了优化。对这些技术的效果进行了研究和比较。对于可穿戴应用，该材料的室温导热系数低至0.65W/mK，塞贝克系数高达-297V/K，同时在25摄氏度至225摄氏度的整个温度范围内保持高热电优值系数ZT为0.87，平均热电系数ZT为0.82，这使得该材料适合于各种发电应用。
Thermoelectric materials could play a crucial role in the future of wearable electronic devices. They can continuously generate electricity from body heat. For efficient operation in wearable systems, in addition to a high thermoelectric figure of merit, zT, the thermoelectric material must have low thermal conductivity and a high Seebeck coefficient. In this study, we successfully synthesized high-performance nanocomposites of n-type Bi2Te2.7Se0.3, optimized especially for body heat harvesting and power generation applications. Different techniques such as dopant optimization, glass inclusion, microwave radiation in a single mode microwave cavity, and sintering conditions were used to optimize the temperature-dependent thermoelectric properties of Bi2Te2.7Se0.3. The effects of these techniques were studied and compared with each other. A room temperature thermal conductivity as low as 0.65 W/mK and high Seebeck coefficient of -297 V/K were obtained for a wearable application, while maintaining a high thermoelectric figure of merit, zT, of 0.87 and an average zT of 0.82 over the entire temperature range of 25 degrees C to 225 degrees C, which makes the material appropriate for a variety of power generation applications.