{"title":"Cu2Se/MXene (Ti3C2Tx) composite achieved ultra-low thermal conductivity and enhanced thermoelectric performance","authors":"","doi":"10.1016/j.physb.2024.416528","DOIUrl":null,"url":null,"abstract":"<div><p>Due to the significant mismatch in phonon density of states between carbon (C) and Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se, the thermal conductivity of Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se can be notably enhanced by incorporating low-dimensional carbon-based materials. This study propose an innovative approach where two-dimensional MXene material Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>C<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>T<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span> is introduced into Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se, creating numerous Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se/MXene heterogeneous interfaces within the matrix. These interfaces induce high-density dislocations, which enhance multi-scale phonon scattering efficiency. Consequently, they significantly reduce lattice thermal conductivity across the entire temperature range tested. Additionally, the heterogeneous interfaces facilitate energy filtration, selectively filtering out low-energy carriers and thereby optimizing the high intrinsic carrier concentration of Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se to a certain extent. Finally, the total thermal conductivity of the Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se/0.4 wt% Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>C<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>T<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span> sample at 795 K is markedly lower at 0.27 Wm<sup>−1</sup>K<sup>−1</sup> compared to the average level of Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se materials. As a result, the <span><math><mrow><mi>Z</mi><msub><mrow><mi>T</mi></mrow><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub></mrow></math></span> reaches 2.11, reflecting a 109% enhancement compared to pristine Cu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Se.</p></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S092145262400869X","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
Due to the significant mismatch in phonon density of states between carbon (C) and CuSe, the thermal conductivity of CuSe can be notably enhanced by incorporating low-dimensional carbon-based materials. This study propose an innovative approach where two-dimensional MXene material TiCT is introduced into CuSe, creating numerous CuSe/MXene heterogeneous interfaces within the matrix. These interfaces induce high-density dislocations, which enhance multi-scale phonon scattering efficiency. Consequently, they significantly reduce lattice thermal conductivity across the entire temperature range tested. Additionally, the heterogeneous interfaces facilitate energy filtration, selectively filtering out low-energy carriers and thereby optimizing the high intrinsic carrier concentration of CuSe to a certain extent. Finally, the total thermal conductivity of the CuSe/0.4 wt% TiCT sample at 795 K is markedly lower at 0.27 Wm−1K−1 compared to the average level of CuSe materials. As a result, the reaches 2.11, reflecting a 109% enhancement compared to pristine CuSe.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces