Magnetism-induced huge enhancement of the room-temperature thermoelectric and cooling performance of p-type BiSbTe alloys,Energy & Environmental Science

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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 Bi_0.5Sb_1.5Te₃ matrix to improve the thermoelectric and cooling performance near room temperature. It is discovered that the Seebeck coefficient of the Fe₃O₄/Bi_0.5Sb_1.5Te₃ 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 Bi_0.5Sb_1.5Te₃ 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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