{"title":"通过掺杂银提高 Cu2Se 的热电性能","authors":"","doi":"10.1016/j.jssc.2024.124951","DOIUrl":null,"url":null,"abstract":"<div><p>Cu<sub>2</sub>Se as a thermoelectric material has gained popularity in recent years because of the excellent properties resulting from its superionicity. In this study, Cu<sub>2-x</sub>Ag<sub>x</sub>Se (x = 0, 0.05, 0.15, 0.25) samples were fabricated through the spark plasma sintering method, followed by a comprehensive microstructure and thermoelectric properties analysis. The results indicated that, when the doping amount of Ag is x ≥ 0.05, the CuAgSe phase is produced at room temperature, which introduces an energy filtering effect, resulting in an augmentation of the Seebeck coefficient and a reduction in the electrical conductivity. Ag doping leads to point defects, the disorder of cations, and the phase boundaries which increases phonon scattering, resulting in reduced thermal conductivity. At 773 K, the thermal conductivity decreases from 1.10 Wm<sup>−1</sup>K<sup>−1</sup> for Cu<sub>2</sub>Se to 0.41 Wm<sup>−1</sup>K<sup>−1</sup> for Cu<sub>1.75</sub>Ag<sub>0.25</sub>Se. Compared to ZT ∼ 0.8 for the intrinsic Cu<sub>2</sub>Se sample, the ZT of Cu<sub>1.75</sub>Ag<sub>0.25</sub>Se reaches 1.41 at 773 K, which is an increase of over 70 %.</p></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":null,"pages":null},"PeriodicalIF":3.2000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhancing the thermoelectric performance of Cu2Se via Ag doping\",\"authors\":\"\",\"doi\":\"10.1016/j.jssc.2024.124951\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Cu<sub>2</sub>Se as a thermoelectric material has gained popularity in recent years because of the excellent properties resulting from its superionicity. In this study, Cu<sub>2-x</sub>Ag<sub>x</sub>Se (x = 0, 0.05, 0.15, 0.25) samples were fabricated through the spark plasma sintering method, followed by a comprehensive microstructure and thermoelectric properties analysis. The results indicated that, when the doping amount of Ag is x ≥ 0.05, the CuAgSe phase is produced at room temperature, which introduces an energy filtering effect, resulting in an augmentation of the Seebeck coefficient and a reduction in the electrical conductivity. Ag doping leads to point defects, the disorder of cations, and the phase boundaries which increases phonon scattering, resulting in reduced thermal conductivity. At 773 K, the thermal conductivity decreases from 1.10 Wm<sup>−1</sup>K<sup>−1</sup> for Cu<sub>2</sub>Se to 0.41 Wm<sup>−1</sup>K<sup>−1</sup> for Cu<sub>1.75</sub>Ag<sub>0.25</sub>Se. Compared to ZT ∼ 0.8 for the intrinsic Cu<sub>2</sub>Se sample, the ZT of Cu<sub>1.75</sub>Ag<sub>0.25</sub>Se reaches 1.41 at 773 K, which is an increase of over 70 %.</p></div>\",\"PeriodicalId\":378,\"journal\":{\"name\":\"Journal of Solid State Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2024-08-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Solid State Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022459624004055\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Solid State Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022459624004055","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
摘要
近年来,CuSe 作为一种热电材料越来越受到人们的青睐,因为它的超阳离子性带来了优异的性能。本研究采用火花等离子烧结法制备了 CuAgSe(x = 0、0.05、0.15、0.25)样品,并对其进行了全面的微观结构和热电性能分析。结果表明,当 Ag 掺杂量 x ≥ 0.05 时,室温下会产生 CuAgSe 相,从而引入能量过滤效应,导致塞贝克系数增大和电导率降低。掺杂银会导致点缺陷、阳离子和相界的无序,从而增加声子散射,导致热导率降低。在 773 K 时,热导率从 CuSe 的 1.10 WmK 下降到 CuAgSe 的 0.41 WmK。与本征 CuSe 样品的 ZT ∼ 0.8 相比,CuAgSe 的 ZT 在 773 K 时达到 1.41,增幅超过 70%。
Enhancing the thermoelectric performance of Cu2Se via Ag doping
Cu2Se as a thermoelectric material has gained popularity in recent years because of the excellent properties resulting from its superionicity. In this study, Cu2-xAgxSe (x = 0, 0.05, 0.15, 0.25) samples were fabricated through the spark plasma sintering method, followed by a comprehensive microstructure and thermoelectric properties analysis. The results indicated that, when the doping amount of Ag is x ≥ 0.05, the CuAgSe phase is produced at room temperature, which introduces an energy filtering effect, resulting in an augmentation of the Seebeck coefficient and a reduction in the electrical conductivity. Ag doping leads to point defects, the disorder of cations, and the phase boundaries which increases phonon scattering, resulting in reduced thermal conductivity. At 773 K, the thermal conductivity decreases from 1.10 Wm−1K−1 for Cu2Se to 0.41 Wm−1K−1 for Cu1.75Ag0.25Se. Compared to ZT ∼ 0.8 for the intrinsic Cu2Se sample, the ZT of Cu1.75Ag0.25Se reaches 1.41 at 773 K, which is an increase of over 70 %.
期刊介绍:
Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.