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Magnetism-induced huge enhancement of the room-temperature thermoelectric and cooling performance of p-type BiSbTe alloys
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/10 , DOI: 10.1039/c9ee03446c
Cuncheng Li 1, 2, 3, 4 , Shifang Ma 1, 2, 3, 4 , Ping Wei 1, 2, 3, 4, 5 , Wanting Zhu 1, 2, 3, 4 , Xiaolei Nie 1, 2, 3, 4 , Xiahan Sang 1, 2, 3, 4, 5 , Zhigang Sun 1, 2, 3, 4 , Qingjie Zhang 1, 2, 3, 4 , Wenyu Zhao 1, 2, 3, 4
Affiliation  

Bi2Te3-Based alloys are the only thermoelectric material for commercial applications while their low performance is extremely difficult to improve. Herein, superparamagnetic Fe3O4 nanoparticles (Fe3O4-NPs) are incorporated into a commercial p-type Bi0.5Sb1.5Te3 matrix to improve the thermoelectric and cooling performance near room temperature. It is discovered that the Seebeck coefficient of the Fe3O4/Bi0.5Sb1.5Te3 nanocomposites remarkably increased while the thermal conductivity significantly decreased because of the carrier multiple scattering and the enhanced phonon scattering induced by the Fe3O4-NPs, respectively. The maximum ZT reaches 1.5 at 340 K for the nanocomposite with 0.15 wt% of Fe3O4-NPs, being 32% higher than that of the matrix. At near room temperature, the huge cooling temperature difference reaches 5.4 K for a single-leg device made with the nanocomposite, increased by about 3 times as compared with the 1.8 K of the device made with the Bi0.5Sb1.5Te3 matrix. This work reveals that introducing superparamagnetic nanoparticles is a universal approach to simultaneously enhance the thermoelectric and cooling performance of p-type BiSbTe-based alloys.

中文翻译:

磁性极大地增强了p型BiSbTe合金的室温热电和冷却性能

Bi 2 Te 3基合金是唯一用于商业应用的热电材料,而其低性能却极难改善。在本文中,将超顺磁性的Fe 3 O 4纳米颗粒(Fe 3 O 4 -NPs)掺入市售的p型Bi 0.5 Sb 1.5 Te 3基质中,以改善室温附近的热电和冷却性能。发现Fe 3 O 4 / Bi 0.5 Sb 1.5 Te 3的塞贝克系数纳米复合材料显着增加,而热导率则显着降低,这分别是由于Fe 3 O 4 -NPs引起的载流子多重散射和增强的声子散射。对于具有0.15wt%的Fe 3 O 4 -NPs的纳米复合材料,最大ZT在340K下达到1.5,比基体的ZT高32%。在接近室温的情况下,使用纳米复合材料制成的单腿装置的巨大冷却温度差达到5.4 K,与使用Bi 0.5 Sb 1.5 Te 3制成的装置的1.8 K相比,增大了约3倍。矩阵。这项工作表明,引入超顺磁性纳米粒子是同时增强p型BiSbTe基合金的热电和冷却性能的通用方法。
更新日期:2020-02-19
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