High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-21 , DOI: 10.1002/adfm.202205458
Qiang Zhang _{1,

2} , Zhe Guo _{1,

2} , Ruoyu Wang _{1,

2} , Xiaojian Tan _{1,

2} , Kun Song ₁ , Peng Sun _{1,

2} , Haoyang Hu ₁ , Chen Cui ₁ , Guo‐Qiang Liu _{1,

2} , Jun Jiang _{1,

2}

Affiliation

The emerged strategy of entropy engineering provides new ideas for realizing high-performance thermoelectric materials, but it is still much unresolved how to achieve delicate trade-off between the carrier mobility m_H and the lattice thermal conductivity κ_ph in taking advantage of configurational entropy ΔS. Herein, the significant advances of ultralow κ_ph yet decent m_H in a new medium-entropy system of well-designed (Pb, Ge, Sb, Cd) co-alloyed SnTe is reported. Moreover, the co-alloying also optimizes the carrier concentration n_H and promotes the valence band convergence, thereby yielding an excellent Seebeck coefficient and compensating for decreased electrical conductivity. Consequently, a high peak ZT of 1.5 at 800 K, a record average ZT of 0.84 (300−800 K), and a remarkable Vickers hardness of 134 H_V are concurrently attained in Cd_0.02(Sn_0.59Pb_0.15Ge_0.2Sb_0.06)_0.98Te. Benefiting from the synergistically increased ZT and mechanical strength, the fabricated 17-couple SnTe-based thermoelectric module exhibits a competitive conversion efficiency of 6.3% at ΔT = 350 °C. This study not only provides a paradigm of the medium-entropy design for thermoelectric materials but also puts forward an innovative scheme for low-grade heat harvest by SnTe-based TE module.

中文翻译：

中熵工程驱动的 SnTe 高性能热电材料和模块

熵工程的兴起为高性能热电材料的实现提供了新思路，但如何利用构型熵Δ实现载流子迁移率m _H和晶格热导率κ _{ph之间的微妙权衡仍是一大难题。}年代。在此，报告了在精心设计的（Pb、Ge、Sb、Cd）共合金 SnTe 的新中等熵系统中超低 κ _ph和良好m _{H的显着进展。}此外，共合金化还优化了载流子浓度n _H并促进价带收敛，从而产生出色的塞贝克系数并补偿降低的电导率。_{因此，在 Cd 0.02} (Sn _0.59 Pb _0.15 Ge _0.2 Sb _0.06 )中同时获得了800 K 时 1.5 的高峰值ZT、0.84 (300-800 K)的创纪录平均ZT和 134 H _{V的显着维氏硬度}_0.98碲得益于协同增加的ZT和机械强度，制造的 17 对 SnTe 基热电模块在ΔT下表现出具有竞争力的 6.3% 转换效率 = 350°C。该研究不仅为热电材料的中熵设计提供了范式，还提出了一种基于 SnTe 的热电组件低品位热收集的创新方案。

更新日期：2022-06-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11