{"title":"利用掺杂和复合策略提高 CaMnO3 包晶的热电性能","authors":"Shanshan Xu, Hongxin Wang, Tong'an Bu, Xinlei Wang, Zhichao Dong, Mingwei Zhang, Cuncheng Li, Wenyu Zhao","doi":"10.1016/j.ceramint.2024.07.102","DOIUrl":null,"url":null,"abstract":"<p>The performance of high-temperature thermoelectric material CaMnO<sub>3</sub> is primarily limited by its high electrical resistivity and thermal conductivity. In this study, we synergistically optimized its electrical and thermal transport properties by employing a combination of doping and compositing strategies. The results suggest that Yb doping promotes the transfer of electrons to the Mn <em>d</em> orbital and facilitates the double exchange interactions between neighbor Mn<sup>3+</sup> and Mn<sup>4+</sup>, leading to decreased electrical resistivity and a transition of electron transport mechanism from semiconductor to metal. The further addition of CoAl<sub>2</sub>O<sub>4</sub> nanoparticles improves the Seebeck coefficient by reducing carrier concentration and increasing electron scattering, ultimately enhancing the power factor. Meanwhile, the fluctuations in atomic mass and increased interface density strengthen the interface phonon scattering, which results in a significant reduction in lattice thermal conductivity. As a result, the Ca<sub>0.95</sub>Yb<sub>0.05</sub>MnO<sub>3</sub> with 2 <em>wt.</em>% CoAl<sub>2</sub>O<sub>4</sub> nanoparticles exhibits a maximum <em>ZT</em> value of 0.12 at 850 K, representing a 180% improvement compared to the pristine material. This study highlights the effectiveness of the combined doping and compositing strategy in enhancing the thermoelectric performance of CaMnO<sub>3</sub> materials and offers a promising approach for optimizing other oxide thermoelectric materials.</p>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Utilization of doping and compositing strategy for enhancing the thermoelectric performance of CaMnO3 perovskite\",\"authors\":\"Shanshan Xu, Hongxin Wang, Tong'an Bu, Xinlei Wang, Zhichao Dong, Mingwei Zhang, Cuncheng Li, Wenyu Zhao\",\"doi\":\"10.1016/j.ceramint.2024.07.102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The performance of high-temperature thermoelectric material CaMnO<sub>3</sub> is primarily limited by its high electrical resistivity and thermal conductivity. In this study, we synergistically optimized its electrical and thermal transport properties by employing a combination of doping and compositing strategies. The results suggest that Yb doping promotes the transfer of electrons to the Mn <em>d</em> orbital and facilitates the double exchange interactions between neighbor Mn<sup>3+</sup> and Mn<sup>4+</sup>, leading to decreased electrical resistivity and a transition of electron transport mechanism from semiconductor to metal. The further addition of CoAl<sub>2</sub>O<sub>4</sub> nanoparticles improves the Seebeck coefficient by reducing carrier concentration and increasing electron scattering, ultimately enhancing the power factor. Meanwhile, the fluctuations in atomic mass and increased interface density strengthen the interface phonon scattering, which results in a significant reduction in lattice thermal conductivity. As a result, the Ca<sub>0.95</sub>Yb<sub>0.05</sub>MnO<sub>3</sub> with 2 <em>wt.</em>% CoAl<sub>2</sub>O<sub>4</sub> nanoparticles exhibits a maximum <em>ZT</em> value of 0.12 at 850 K, representing a 180% improvement compared to the pristine material. This study highlights the effectiveness of the combined doping and compositing strategy in enhancing the thermoelectric performance of CaMnO<sub>3</sub> materials and offers a promising approach for optimizing other oxide thermoelectric materials.</p>\",\"PeriodicalId\":267,\"journal\":{\"name\":\"Ceramics International\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-07-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Ceramics International\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.ceramint.2024.07.102\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.ceramint.2024.07.102","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Utilization of doping and compositing strategy for enhancing the thermoelectric performance of CaMnO3 perovskite
The performance of high-temperature thermoelectric material CaMnO3 is primarily limited by its high electrical resistivity and thermal conductivity. In this study, we synergistically optimized its electrical and thermal transport properties by employing a combination of doping and compositing strategies. The results suggest that Yb doping promotes the transfer of electrons to the Mn d orbital and facilitates the double exchange interactions between neighbor Mn3+ and Mn4+, leading to decreased electrical resistivity and a transition of electron transport mechanism from semiconductor to metal. The further addition of CoAl2O4 nanoparticles improves the Seebeck coefficient by reducing carrier concentration and increasing electron scattering, ultimately enhancing the power factor. Meanwhile, the fluctuations in atomic mass and increased interface density strengthen the interface phonon scattering, which results in a significant reduction in lattice thermal conductivity. As a result, the Ca0.95Yb0.05MnO3 with 2 wt.% CoAl2O4 nanoparticles exhibits a maximum ZT value of 0.12 at 850 K, representing a 180% improvement compared to the pristine material. This study highlights the effectiveness of the combined doping and compositing strategy in enhancing the thermoelectric performance of CaMnO3 materials and offers a promising approach for optimizing other oxide thermoelectric materials.
期刊介绍:
Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties.
Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour.
Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.