材料科学
热电效应
功勋
热电材料
热导率
光电子学
能量转换效率
工程物理
掺杂剂
塞贝克系数
热电发电机
带隙
凝聚态物理
兴奋剂
热力学
复合材料
物理
作者
Chenguang Fu,Shengqiang Bai,Yintu Liu,Yuyan Tang,Lidong Chen,Xinbing Zhao,Tiejun Zhu
摘要
Abstract Solid-state thermoelectric technology offers a promising solution for converting waste heat to useful electrical power. Both high operating temperature and high figure of merit zT are desirable for high-efficiency thermoelectric power generation. Here we report a high zT of ∼1.5 at 1,200 K for the p -type FeNbSb heavy-band half-Heusler alloys. High content of heavier Hf dopant simultaneously optimizes the electrical power factor and suppresses thermal conductivity. Both the enhanced point-defect and electron–phonon scatterings contribute to a significant reduction in the lattice thermal conductivity. An eight couple prototype thermoelectric module exhibits a high conversion efficiency of 6.2% and a high power density of 2.2 W cm −2 at a temperature difference of 655 K. These findings highlight the optimization strategy for heavy-band thermoelectric materials and demonstrate a realistic prospect of high-temperature thermoelectric modules based on half-Heusler alloys with low cost, excellent mechanical robustness and stability.
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