Controlling Oxygen Vacancies in Sr0.875La0.1TiO3 with the Nano Titanium for Optimizing Thermoelectric Performance

IF 5.5 3区材料科学 Q2 CHEMISTRY, PHYSICAL ACS Applied Energy Materials Pub Date : 2024-12-03 DOI:10.1021/acsaem.4c02807

Zhihao Lou, Ziyao Wei, Jianjun Gou, Jie Xu, Chunlin Gong and Feng Gao*,

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Abstract

The nanosized titanium powder exhibits a strong oxygen capture ability, which can effectively increase the carrier concentration of SrTiO₃. However, it is essential to prevent oxidation before sintering. In this study, the impact of cold isostatic pressing (CIP) and calcination in an argon atmosphere on the microstructure and thermoelectric properties of Sr_0.875La_0.1TiO₃/nano Ti ceramics was explored. The results indicate that the carrier concentration of samples prepared by CIP can be significantly enhanced while simultaneously reducing the thermal conductivity through a notable grain size reduction of titanium oxide and augmentation of oxygen vacancy concentration. At 1073 K, the ZT value of the sample calcined in air and prepared by CIP was 0.22, exhibiting a 27% enhancement compared to that of the sample formed by dry press. Therefore, the combination of CIP and nanoscale Ti provides an efficient approach to manipulate the electrical and thermal transport properties of SrTiO₃ thermoelectric ceramics.

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纳米钛控制Sr0.875La0.1TiO3中氧空位优化热电性能

纳米钛粉具有较强的氧捕获能力，可有效提高SrTiO3的载流子浓度。但是，在烧结前必须防止氧化。研究了冷等静压（CIP）和氩气焙烧对Sr0.875La0.1TiO3/纳米Ti陶瓷显微组织和热电性能的影响。结果表明，通过显著减小氧化钛晶粒尺寸和提高氧空位浓度，CIP法制备的样品在降低导热系数的同时，载流子浓度也得到了显著提高。在1073 K时，CIP法制备的空气焙烧样品的ZT值为0.22，比干压法制备样品的ZT值提高了27%。因此，CIP和纳米级Ti的结合提供了一种有效的方法来操纵SrTiO3热电陶瓷的电和热输运性质。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.

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