材料科学
热电效应
层错能
热电材料
功勋
无量纲量
复合材料
共形矩阵
塞贝克系数
热导率
光电子学
热电发电机
热力学
微观结构
物理
作者
Shiqi Yang,Zhiqiang Gao,Pengfei Qiu,Jiayuan Liang,Tian‐Ran Wei,Tingting Deng,Jie Xiao,Xun Shi,Lidong Chen
标识
DOI:10.1002/adma.202007681
摘要
Abstract Hetero‐shaped thermoelectric (TE) generators (TEGs) can power the sensors used in safety monitoring systems of undersea oil pipelines, but their development is greatly limited by the lack of materials with both good shape‐conformable ability and high TE performance. In this work, a new ductile inorganic TE material, Ag 20 S 7 Te 3 , with high TE performance is reported. At 300–600 K, Ag 20 S 7 Te 3 crystallizes in a body‐centered cubic structure, in which S and Te atoms randomly occupy the (0, 0, 1) site. Due to the smaller generalized stacking fault energy in the ()[010] slip system, Ag 20 S 7 Te 3 shows better ductility than Ag 2 S, yielding excellent shape‐conformability. The high carrier mobility and low lattice thermal conductivity observed in Ag 20 S 7 Te 3 result in a maximum dimensionless figure of merit ( zT ) of 0.80 at 600 K, which is comparable with the best commercial Bi 2 Te 3 ‐based alloys. The prototype TEG consisting of 10 Ag 20 S 7 Te 3 strips displays an open‐circuit voltage of 69.2 mV and a maximum power output of 17.1 µW under the temperature difference of 70 K. This study creates a new route toward hetero‐shaped TEG.
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