Synergistic Optimization of Electrical-Thermal-Mechanical Properties of the In-Filled CoSb3 Material by Introducing Bi0.5Sb1.5Te3 Nanoparticles
Synergistic Optimization of Electrical-Thermal-Mechanical Properties of the In-Filled CoSb3 Material by Introducing Bi0.5Sb1.5Te3 Nanoparticles
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引入 Bi0.5Sb1.5Te3 纳米颗粒协同优化填充 CoSb3 材料的电热机械性能
DOI：
10.1021/acsami.1c03351
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发表时间：
2021
影响因子：
9.5
通讯作者：
Zhao Wenyu
中科院分区：
文献类型：
--
作者：
Zhu Jianglong;Liu Zhiyuan;Tong Xin;Xia Ailin;Xu Dong;Lei Ying;Yu Jian;Tang Dingguo;Ruan Xuefeng;Zhao Wenyu
如何实现热电材料电-热-机械性能的协同优化是热电材料的关键挑战。使用bi0.5 sb1.5 te3纳米颗粒作为混合剂提供了解决这一挑战的有效方法。本文采用超声分散与放电等离子烧结相结合的方法，成功制备了不同含量Bi0.5Sb1.5Te3/ in0.25 co4sb12纳米复合材料。物相和微观结构表征表明，在SPS烧结过程中，从bi0.5 sb1.5 te3中析出了Te纳米颗粒。输运测量结果表明，由于Te纳米颗粒与基体之间的电荷转移导致载流子浓度增加，电导率提高。由于电子散射的选择和散射因子的增加，塞贝克系数也增加了。由于bi0.5 sb1.5 te3纳米粒子和原位沉淀的Te纳米粒子引起声子散射增强和位错增加，晶格热导率显著降低。结果表明，当掺杂0.1 wt %的bi0.5 sb1.5 te3纳米悬浮液时，纳米复合材料的电输运和热输运性质解耦，在300-700 K范围内获得了较高的平均zt1值。此外，复合材料的抗弯强度、断裂韧性和硬度也得到了显著提高。本研究表明，使用bi0.5 sb1.5 te3纳米颗粒作为混合剂，可以实现填充cosb3热电材料电-热-机械性能的协同优化。
How to realize the synergistic optimization of electrical–thermal–mechanical properties of thermoelectric materials is a key challenge. Using the Bi0.5Sb1.5Te3nanoparticle as a mixed agent provides an effective way to address this challenge. Here, Bi0.5Sb1.5Te3/In0.25Co4Sb12nanocomposites with different contents of Bi0.5Sb1.5Te3nanoparticles were successfully prepared by ultrasonic dispersion combined with spark plasma sintering. Phase and microstructure characterization presented that Te nanoparticles were precipitated from Bi0.5Sb1.5Te3during the SPS sintering process. Transport measurement results showed that the electrical conductivity was increased due to the increased carrier concentration induced by the charge transfer between Te nanoparticles and the matrix. The Seebeck coefficient was also increased due to the selected electron scattering and increased scattering factor. The lattice thermal conductivity was dramatically suppressed because of the enhanced phonon scattering induced by the Bi0.5Sb1.5Te3nanoparticles and in situ-precipitated Te nanoparticles and increased dislocations. As a result, a higher averageZTvalue of 1 was obtained in the range of 300–700 K by the decoupling of the electrical and thermal transport properties for the nanocomposite with 0.1 wt % of Bi0.5Sb1.5Te3nanometer suspension. Furthermore, the flexural strength, fracture toughness, and hardness of the nanocomposites were also improved significantly. This work demonstrates that using the Bi0.5Sb1.5Te3nanoparticle as a mixed agent can realize the synergistic optimization of electrical–thermal–mechanical properties of the In-filled CoSb3thermoelectric material.