通过 3D 打印驱动缺陷工程实现 n 型 Bi2Te2.7Se0.3 高热电性能的宽温平台,ACS Applied Materials & Interfaces

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通过 3D 打印驱动缺陷工程实现 n 型 Bi2Te2.7Se0.3 高热电性能的宽温平台
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-23 , DOI: 10.1021/acsami.2c19131
Qiujun Hu ₁ , Ding Luo ₂ , Junbiao Guo ₃ , Wenbin Qiu ₃ , Xiaoyong Wu ₄ , Lei Yang ₅ , Zhengshang Wang ₆ , Xudong Cui ₆ , Jun Tang _{1,

3}

Affiliation

_{需要基于 Bi 2} Te ₃的高能量转换热电发电机 (TEG) 来确保组装材料具有较高的平均品质因数 ( ZT _ave )。然而，n型腿较差的ZT _{ave严重制约了Bi}₂ Te ₃基TEG的大规模应用。在这项研究中，我们实现并报告了三维 (3D) 打印 n 型 Bi ₂ Te _2.7 Se _0.3的高峰值ZT (1.33) 。此外，在 300 至 500 K 的温度范围内实现了 1.23的优异ZT _{ave 。}的高价值ZT _ave是通过使用 3D 打印驱动的缺陷工程协同优化电子和声子传输特性获得的。非平衡凝固机制促进了 3D 打印过程中形成的多尺度缺陷。在形成的缺陷中，纳米孪晶触发了能量过滤效应，从而在 300-500 K 的温度范围内提高了塞贝克系数。多尺度缺陷对宽频声子的有效散射使晶格热导率降低到接近理论最小值~0.35 W m ^–1 k ^–1. 鉴于 3D 打印在自由形式设备形状方面的优势，我们组装并测量了仿生蜂窝状单腿 TEG，显示出创纪录的高能量转换效率 (10.2%)。这项工作展示了选择性激光熔化 3D 打印技术驱动的缺陷工程在合理设计先进 n 型 Bi ₂ Te _2.7 Se _0.3热电材料方面的巨大潜力。

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Broad Temperature Plateau for High Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 by 3D Printing-Driven Defect Engineering

High-energy-conversion Bi₂Te₃-based thermoelectric generators (TEGs) are needed to ensure that the assembled material has a high value of average figure of merit (ZT_ave). However, the inferior ZT_ave of the n-type leg severely restricts the large-scale applications of Bi₂Te₃-based TEGs. In this study, we achieved and reported a high peak ZT (1.33) of three-dimensional (3D)-printing n-type Bi₂Te_2.7Se_0.3. In addition, a superior ZT_ave of 1.23 at a temperature ranging from 300 to 500 K was achieved. The high value of ZT_ave was obtained by synergistically optimizing the electronic- and phonon-transport properties using the 3D-printing-driven defect engineering. The nonequilibrium solidification mechanism facilitated the multiscale defects formed during the 3D-printed process. Among the defects formed, the nanotwins triggered the energy-filtering effect, thus enhancing the Seebeck coefficient at a temperature range of 300–500 K. The effective scattering of wide-frequency phonons by multiscale defects reduced the lattice thermal conductivity close to the theoretical minimum of ∼0.35 W m^–1 k^–1. Given the advantages of 3D printing in freeform device shapes, we assembled and measured bionic honeycomb-shaped single-leg TEGs, exhibiting a record-high energy conversion efficiency (10.2%). This work demonstrates the great potential of defect engineering driven by selective laser melting 3D-printing technology for the rational design of advanced n-type Bi₂Te_2.7Se_0.3 thermoelectric material.

更新日期：2022-12-23

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