Significant Enhancement of Thermoelectric Figure of Merit in BiSbTe-Based Composites by Incorporating Carbon Microfiber

Yang Guangsai; Sang Lina; Yun Frank FeiMitchell David R. G.Casillas GilbertoYe NingSee KhayPei JunWang XungaiLi Jing-FengSnyder G. JeffreyWang Xiaolin

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Significant Enhancement of Thermoelectric Figure of Merit in BiSbTe-Based Composites by Incorporating Carbon Microfiber

机译：Significant Enhancement of Thermoelectric Figure of Merit in BiSbTe-Based Composites by Incorporating Carbon Microfiber

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Bismuth telluride-based materials are already being commercially developed for thermoelectric (TE) cooling devices and power generators. However, the relatively low efficiency, which is characterized by a TE figure of merit, zT, is the main obstacle to more widespread application. Significant advances in the TE performance have been made through boundary engineering via embedding nanoinclusions or nanoscale grains. Herein, an effective approach to greatly enhance the TE performance of p-type BiSbTe material by incorporating carbon microfibers is reported. A high zT of 1.4 at 375 K and high average zT of 1.25 for temperatures in the range of 300 to 500 K is achieved in the BiSbTe/carbon microfiber (BST/CF) composite materials. Their superior TE performance originates from the low thermal conductivity and the relatively high power factor. A TE unicouple device based on the p-type BST/CF composite material and the commercially available n-type bismuth telluride-based material shows a huge cooling temperature drop in the operating temperature range of 299-375 K, and is greatly superior to the unicouple device made of both commercial p-type and n-type bismuth telluride-based material. The materials demonstrate a high average zT and excellent mechanical properties and are strong candidates for practical applications.

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来源
《Advanced functional materials》 |2021年第15期|2008851.1-2008851.12|共12页
作者
Yang Guangsai; Sang Lina; Yun Frank FeiMitchell David R. G.Casillas GilbertoYe NingSee KhayPei JunWang XungaiLi Jing-FengSnyder G. JeffreyWang Xiaolin;
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作者单位

Univ Wollongong, Inst Superconducting & Elect Mat, Australian Inst Innovat Mat, North Wollongong, NSW 2500, Australia|Univ Wollongong, Australian Res Council Ctr Excellence Future Low, North Wollongong, NSW 2500, Australia;

Univ Wollongong, Electron Microscopy Ctr, Australian Inst Innovat Mat, North Wollongong, NSW 2500, Australia;

Chinese Acad Sci, Fujian Inst Res Struct Matter, Fuzhou 350002, Fujian, Peoples R ChinaUniv Wollongong, Inst Superconducting & Elect Mat, Australian Inst Innovat Mat, North Wollongong, NSW 2500, AustraliaTsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R ChinaDeakin Univ, Inst Frontier Mat IFM, Geelong, Vic 3216, AustraliaNorthwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA;

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正文语种英语
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Bi; 0; 5Sb; 1; 5Te; 3; carbon microfibers; cooling performance; high zT; thermoelectric materials;

Significant Enhancement of Thermoelectric Figure of Merit in BiSbTe-Based Composites by Incorporating Carbon Microfiber

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