Achieving High Thermoelectric Properties of Cu2Se via Lattice Softening and Phonon Scattering Mechanism

被引：19

作者：

Bo, Lin ^{[1
]}

Zhang, Ruipeng ^{[1
]}

Zhao, Haoyu ^{[1
]}

Hou, Yangbo ^{[2
]}

Wang, Xinglong ^{[1
]}

Zhu, Junliang ^{[1
]}

Zhao, Linghao ^{[1
]}

Zuo, Min ^{[1
]}

Zhao, Degang ^{[1
]}

机构：

[1] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China

[2] Heze Inst Prod Inspect & Testing, Heze 274000, Peoples R China

来源：

ACS APPLIED ENERGY MATERIALS | 2022年 / 5卷 / 05期

基金：

中国国家自然科学基金;

关键词：

thermoelectric material; microwave melting; lattice softening effect; phonon scattering; phonon group velocities; THERMAL-CONDUCTIVITY; PERFORMANCE; ENTROPY; ENHANCEMENT; CHARGE; ZT; TEMPERATURE; STABILITY; FIGURE; MERIT;

D O I：

10.1021/acsaem.2c00949

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Co-alloying solid solution was regarded as a convenient approach to optimize the thermoelectric properties. In this study, the densified Cu2-x(MnFeNi)(x)Se1-yTey (x = 0-0.09; y = 0-0.03) designed by entropy engineering was prepared via microwave melting and hot-pressing sintering. The scattering mechanism and thermoelectric performance of Cu2Se were evaluated. Due to the regulation of the carrier concentration and structural stabilization of the beta-phase, the electrical performance was significantly enhanced. Moreover, the infrared spectroscopy analysis and the decrease in sound velocity unambiguously demonstrated the existence of a lattice softening effect of bulk Cu2Se. By manipulating the lattice conductivity using entropy engineering, the thermal transport property gradually decreased (similar to 0.4 W m(-1) K-1 at 300 K) due to the lattice softening effect and phonon scattering mechanism. The obtained zT(max) was 1.37 at 750 K in the Cu-2.91(MnFeNi)(0.09)Se0.99Te0.01 sample.

引用

页码：6453 / 6461

页数：9

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