Conformal High-Power-Density Half-Heusler Thermoelectric Modules: A Pathway toward Practical Power Generators
Conformal High-Power-Density Half-Heusler Thermoelectric Modules: A Pathway toward Practical Power Generators
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DOI：
10.1021/acsami.1c16117
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发表时间：
2021-11-17
影响因子：
9.5
通讯作者：
Priya, Shashank
中科院分区：
文献类型：
--
作者：
Li, Wenjie;Nozariasbmarz, Amin;Priya, Shashank
利用塞贝克效应的热电发电机（TEG）为废热回收提供了一种有前途的解决方案。在大量热电（TE）材料中，半赫斯勒（hH）合金是中高温发电应用的主要候选材料。然而，该领域的根本挑战是大晶圆直径下的不均匀材料特性、模块的功率输出不足以及TE模块的刚性形状因素。这限制了TEG在实际应用中的过渡超过三十年。在这里，我们成功地展示了具有均匀TE特性的大直径晶圆，用于高温应用的高功率保形hH TE模块，以及它们直接集成在烟气平台上，如圆柱形管道，以形成大面积柔性TEG。这种新的保形架构设计提供了一个突破，对中/高温TEG超过传统的BiTe和聚合物为基础的灵活TEG设计。与传统的刚性TEG器件相比，由于保形设计而导致的可变填充因子和更大的灵活性导致更高的器件性能。具有72对hH腿的模块在570摄氏度的温差下表现出3.13 W cm（-2）的器件高功率密度和56.6 W的总输出功率。这些结果提供了一个有前途的途径，广泛利用热电技术到废热回收应用，并将有显着的影响，实际的热电转换器的发展。
Thermoelectric generators (TEGs) exploiting the Seebeck effect provide a promising solution for waste heat recovery. Among the large number of thermoelectric (TE) materials, half-Heusler (hH) alloys are leading candidates for medium- to high-temperature power generation applications. However, the fundamental challenge in this field has been inhomogeneous material properties at large wafer diameters, insufficient power output from the modules, and rigid form factors of TE modules. This has restricted the transition of TEGs in practical applications for over three decades. Here, we successfully demonstrate large diameter wafers with uniform TE properties, high-power conformal hH TE modules for high-temperature application, and their direct integration on flue gas platforms, such as cylindrical tubes, to form large area flexible TEGs. This new conformal architecture design provides a breakthrough toward medium-/high-temperature TEGs over the conventional BiTe- and polymer-based flexible TEG design. A variable fill factor and greater flexibility due to the conformal design result in higher device performance as compared to conventional rigid TEG devices. Modules with 72-couple hH legs exhibit a device high-power-density of 3.13 W cm(-2) and a total output power of 56.6 W under a temperature difference of 570 degrees C. These results provide a promising pathway toward widespread utilization of thermoelectric technology into the waste heat recovery application and will have a significant impact on the development of practical thermal to electrical converters.