High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe

Qiang Zhang; Zhe Guo; Ruoyu WangXiaojian TanKun SongPeng SunHaoyang HuChen CuiGuo-Qiang LiuJun Jiang

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High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe

机译：High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe

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The emerged strategy of entropy engineering provides new ideas for realizinghigh-performance thermoelectric materials, but it is still much unresolvedhow to achieve delicate trade-off between the carrier mobility mH and the latticethermal conductivity κ_(ph) in taking advantage of configurational entropyΔS. Herein, the significant advances of ultralow κ_(ph) yet decent m_H in a newmedium-entropy system of well-designed (Pb, Ge, Sb, Cd) co-alloyed SnTe isreported. Moreover, the co-alloying also optimizes the carrier concentrationn_H and promotes the valence band convergence, thereby yielding an excellentSeebeck 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 concurrentlyattained in Cd_(0.02)(Sn_(0.59)Pb_(0.15)Ge_(0.2)Sb_(0.06))_(0.98)Te. Benefiting from the synergisticallyincreased ZT and mechanical strength, the fabricated 17-couple SnTebasedthermoelectric module exhibits a competitive conversion efficiencyof 6.3% at ΔT = 350℃. This study not only provides a paradigm of themedium-entropy design for thermoelectric materials but also puts forwardan innovative scheme for low-grade heat harvest by SnTe-based TE module.

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来源
《Advanced functional materials》 |2022年第35期|2205458.1-2205458.12|共12页
作者
Qiang Zhang; Zhe Guo; Ruoyu WangXiaojian TanKun SongPeng SunHaoyang HuChen CuiGuo-Qiang LiuJun Jiang;
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作者单位

Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201, China University of Chinese Academy of SciencesBeijing 100049, China;

Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201, China;

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正文语种英语
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band engineering; conversion efficiency; medium entropy; SnTe; thermoelectrics;

High-Performance Thermoelectric Material and Module Driven by Medium-Entropy Engineering in SnTe

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