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Mg3(Bi,Sb)2-based thermoelectric modules for efficient and reliable waste-heat utilization up to 750 K
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-06-14 , DOI: 10.1039/d2ee01038k
Yuntian Fu 1 , Qihao Zhang 2 , Zhongliang Hu 1 , Meng Jiang 1 , Aibin Huang 3 , Xin Ai 2 , Shun Wan 4 , Heiko Reith 2 , Lianjun Wang 1 , Kornelius Nielsch 2, 5 , Wan Jiang 1, 6
Affiliation  

Thermoelectric modules can directly convert the waste heat released by plants or vehicles into useful electricity, providing a clean and sustainable way to use fossil energy more efficiently. However, their commercial application in power generation, especially at temperatures above 500 K, has proceeded very slowly due to the low module efficiency, scarce or toxic constituent elements, and lack of stable metallization at high temperatures. Here, we develop a highly efficient, environmentally friendly and cost-effective thermoelectric module by using n-type Se-doped Mg3(Bi,Sb)2 and p-type CoSb3-based skutterudite. The module can operate robustly up to 750 K and achieves a conversion efficiency of over 9% under a temperature difference of 450 K, superior to that of state-of-the-art single-stage thermoelectric modules. These achievements result from a comprehensive study involving optimization of the material composition and microstructure, screening for effective diffusion barrier layers, and rational design of the module structure. Our work demonstrates the feasibility and scalability of efficient and reliable thermoelectric modules based on sustainable elements for broad applications in mid-temperature waste heat recovery.

中文翻译:

基于 Mg3(Bi,Sb)2 的热电模块,可高效可靠地利用高达 750 K 的废热

热电模块可以直接将植物或车辆释放的废热转化为有用的电能,为更有效地利用化石能源提供一种清洁且可持续的方式。然而,由于组件效率低、成分元素稀少或有毒,以及高温下缺乏稳定的金属化,它们在发电中的商业应用,特别是在 500 K 以上的温度下,进展非常缓慢。在这里,我们利用n型Se掺杂的Mg 3 (Bi,Sb) 2和p型CoSb 3开发了一种高效、环保且具有成本效益的热电模块基于方钴矿。该模块可以在高达 750 K 的温度下稳健运行,并在 450 K 的温差下实现超过 9% 的转换效率,优于最先进的单级热电模块。这些成就来自于对材料成分和微观结构的优化、有效扩散阻挡层的筛选以及模块结构的合理设计等综合研究。我们的工作证明了基于可持续元素的高效可靠热电模块在中温废热回收中的广泛应用的可行性和可扩展性。
更新日期:2022-06-14
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