Composite way to superior thermoelectric performance in In filled Co4Sb12

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-07-16 DOI:10.1016/j.solidstatesciences.2025.108028

Sivakumar Neelakandan, Krishnendu Biswas

{"title":"Composite way to superior thermoelectric performance in In filled Co4Sb12","authors":"Sivakumar Neelakandan, Krishnendu Biswas","doi":"10.1016/j.solidstatesciences.2025.108028","DOIUrl":null,"url":null,"abstract":"<div><div>Filled skutterudites are known as a promising material for thermoelectric applications owing to their high zT values. The most explored approaches to reduce the thermal conductivity of CoSb<sub>3</sub>-based materials are either filling suitable electropositive elements into the voids or the formation of composites. The two approaches were combined in this study by preparing and sintering composites of In<sub>0.2</sub>Co<sub>4</sub>Sb<sub>12</sub> and TiS<sub>2</sub> via a gas-solid reaction method. Phase formation of the composites and their surface morphologies were confirmed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). A high-power factor along with a low thermal conductivity value was observed for the 3 % TiS<sub>2</sub> composition resulting in a maximum zT value of 0.32 at 573 K. This is attributed to the 2D structure of the minor phase acting as effective phonon scatterers thereby reducing the thermal conductivity progressively without greatly affecting the electrical properties.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"168 ","pages":"Article 108028"},"PeriodicalIF":3.4000,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Sciences","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1293255825002067","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}

引用次数: 0

Abstract

Filled skutterudites are known as a promising material for thermoelectric applications owing to their high zT values. The most explored approaches to reduce the thermal conductivity of CoSb₃-based materials are either filling suitable electropositive elements into the voids or the formation of composites. The two approaches were combined in this study by preparing and sintering composites of In_0.2Co₄Sb₁₂ and TiS₂ via a gas-solid reaction method. Phase formation of the composites and their surface morphologies were confirmed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). A high-power factor along with a low thermal conductivity value was observed for the 3 % TiS₂ composition resulting in a maximum zT value of 0.32 at 573 K. This is attributed to the 2D structure of the minor phase acting as effective phonon scatterers thereby reducing the thermal conductivity progressively without greatly affecting the electrical properties.

Abstract Image

查看原文本刊更多论文

in填充Co4Sb12的复合方式具有优越的热电性能

由于其具有较高的zT值，填充的角钨矿被认为是热电应用的一种有前途的材料。目前研究最多的降低cosb3基材料导热系数的方法是在空隙中填充合适的正电元素或形成复合材料。本研究将这两种方法结合起来，采用气固反应法制备并烧结In0.2Co4Sb12和TiS2复合材料。采用x射线衍射（XRD）、场发射扫描电镜（FE-SEM）和透射电镜（TEM）对复合材料的相形成和表面形貌进行了表征。在573 K时，观察到3% TiS2成分具有高功率因数和低导热系数，导致zT值最大为0.32。这是由于小相的二维结构作为有效的声子散射体，从而逐步降低热导率，而不会对电学性能产生很大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.