材料科学技术(英文版)2024，Vol.179Issue(12) ：138-144.DOI:10.1016/j.jmst.2023.08.049

Constructing cell-membrane-mimic grain boundaries for high-performance n-type Ag2Se using high-dielectric-constant TiO2

Yi-Yan Liao Qiang Sun Xu-Ping Jiang Hao Wu Bang-Zhou Tian Ze-Gao Wang Kun Zheng Lei Yang
材料科学技术(英文版)2024，Vol.179Issue(12) ：138-144.DOI:10.1016/j.jmst.2023.08.049
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Constructing cell-membrane-mimic grain boundaries for high-performance n-type Ag2Se using high-dielectric-constant TiO2

Yi-Yan Liao 1Qiang Sun 2Xu-Ping Jiang 1Hao Wu 3Bang-Zhou Tian 1Ze-Gao Wang 1Kun Zheng 4Lei Yang1
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作者信息

  • 1. School of Materials Science & Engineering,Sichuan University,Chengdu 610064,China
  • 2. State Key Laboratory of Oral Diseases,National Clinical Research Center for Oral Diseases,West China Hospital of Stomatology,Sichuan University,Chengdu 610041,China;Sichuan Provincial Engineering Research Center of Oral Biomaterials,Sichuan University,Chengdu 610041,China
  • 3. Department of Stomatology,the First Medical Centre,Chinese PLA General Hospital,Beijing 100853,China
  • 4. Beijing Key Lab of Microstructure and Properties of Solids,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China
  • 折叠

Abstract

The coupling of charge carrier and phonon transport limits the application of Ag2Se as a low-toxic near-room-temperature thermoelectric material.Strategies that reduce the thermal conductivity via enhanc-ing the phonon scattering usually lead to reduced carrier mobility due to high grain boundary potential barrier.In this study,we developed a cell-membrane-mimic grain boundary engineering strategy for de-coupling the charge carrier and phonon scattering through decorating high-dielectric-constant rutile TiO2 at Ag2Se grain boundaries to enable the charge carrier/phonon selective permeability.The nano-sized TiO2 with high dielectric permittivity can secure the charge carrier transport by shielding the interfacial Coulomb potential to lower the energy barrier of grain boundaries,rendering an enhanced power factor.Additionally,benefited from the enhanced phonon scattering by TiO2 nanoparticles,a significantly de-creased lattice thermal conductivity of～0.20 W m-1 K-1 and a high zT of～0.97 at 390 K are obtained in the Ag2Se-based nanocomposites.This work demonstrates that such cell-membrane-mimic grain bound-ary engineering strategy may shed light on developing high-performance thermoelectric materials.

Key words

Thermoelectric/Ag2Se/Grain boundary decoration/High-dielectric-constant/TiO2

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基金项目

facilities,and the scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility at the()

National Natural Science Foundation of China(12074015)

National Natural Science Foundation of China(52002254)

National Natural Science Foundation of China(52272160)

Sichuan Science and Technology Program(2023YFG0220)

Fundamental Research Funds for the Central Universities(YJ202242)

Research Funding from West China School/Hospital of Stomatology Sichuan University(QDJF2022-2)

State Key Laboratory for Mechanical Behavior of Materials(20232509)

fund of the State Key Laboratory of Solidification Processing in NPU(SKLSP202315)

出版年

2024
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

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影响因子：0.657
ISSN：1005-0302
参考文献量53
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