缺陷-核壳-多孔结构协同优化二氧化钛陶瓷材料的电热输运性能

doi:10.15541/jim20260014

无机材料学报

• •

缺陷-核壳-多孔结构协同优化二氧化钛陶瓷材料的电热输运性能

薛静², 唐子璇¹, 温宇凡¹, 肖淑艳¹, 安胜利², 董忠平^1,3,4

1.内蒙古科技大学材料科学与工程学院,包头 014010;
2.内蒙古科技大学稀土产业学院, 包头 014010;
3.内蒙古自治区先进陶瓷材料与器件重点实验室, 包头 014010;
4.轻稀土资源绿色提取与高效利用教育部重点实验室(内蒙古科技大学), 包头 014010

收稿日期:2026-01-10 修回日期:2026-03-05
通讯作者: 董忠平, 副教授. E-mail: dzp05291128@163.com
作者简介:薛静(1998-), 女, 硕士研究生. E-mail: 1519432903@qq.com
基金资助:
国家自然科学基金(21761027); 内蒙古自治区自然科学基金 (2025LHMS02007)

Synergistic Optimization of Thermoelectric Transport Properties in Titanium Dioxide Ceramics via Defect-core-shell-porous Structure

XUE Jing², TANG Zixuan¹, WEN Yufan¹, XIAO Shuyan¹, AN Shengli², DONG Zhongping^1,3,4

1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. School of Rare earth Industry, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices, Baotou 014010, China;
4. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources (Inner Mongolia University of Science and Technology), Ministry of Education, Baotou 014010, China

Received:2026-01-10 Revised:2026-03-05
Contact: DONG Zhongping, associate professor. E-mail: dzp05291128@163.com
About author:XUE Jing (1998-), female, Master candidate. E-mail: 1519432903@qq.com
Supported by:
National Natural Science Foundation of China (21761027); Natural Science Foundation of Inner Mongolia Autonomous Region (2025LHMS02007)

摘要/Abstract

摘要： 二氧化钛是潜在的高性能热电材料,但转换效率低,限制了进一步的应用。本研究采用钛酸四丁酯包覆二氧化钛制备核-壳结构粉体,并通过高温氩气气氛烧结制备陶瓷热电材料TBT-x%(x=0, 5, 10, 15, 20)。随着二氧化钛包覆层的质量比增加,材料的电导率和功率因子大幅升高,热导率显著降低。其中,TBT-20%在873 K的功率因子达到355 μW·m^-1·K^-2,热导率降至2.29 W·m^-1·K^-1,热电优值为0.135。钛酸四丁酯水解生成的有机物分散于粉体中,烧结生坯过程中,有机物碳化在陶瓷中产生孔隙。碳化形成的碳在还原二氧化钛产生氧缺陷的同时也抑制了晶粒生长,增加了晶界密度。氧缺陷增加提高了载流子浓度,缺陷、晶界、核-壳结构与孔隙构成的梯度结构增强了对声子的散射,降低了有效声速,使晶格热导率大幅减小。因此,本研究利用“缺陷-晶界-核壳-孔隙结构”协同实现电热输运性能同步优化,热电转换效率得到显著提高。

关键词: 二氧化钛, 缺陷, 核-壳, 孔隙, 热电性能

Abstract: Titanium dioxide is a potential high-performance thermoelectric material, but its low conversion efficiency limits further application. In this study, a core-shell structure powder was prepared by encapsulating titanium dioxide with tetrabutyl titanate, and ceramic thermoelectric materials, TBT-x%(x=0, 5, 10, 15, 20), were fabricated through high-temperature argon atmosphere sintering. With the proportion of titanium dioxide coating increasing, the electrical conductivity and power factor of materials increase significantly, and the thermal conductivity decreases markedly. At 873 K, TBT-20% had a power factor of 355 μW·m^-1·K^-2, a thermal conductivity of 2.29 W·m^-1·K^-1, and a thermoelectric figure of merit of 0.135. The organic substances generated by the hydrolysis of tetrabutyl titanate were dispersed in the powder, which carbonized and formed pores in the ceramic during sintering process. The carbon derived from carbonization not only reduced titanium dioxide but also inhibited grain growth, increasing the grain boundary density. The increase in oxygen defects enhanced the carrier concentration, while the defects, grain boundaries, core-shell structure, and pores formed a gradient structure that enhanced the scattering of phonons and reduced the effective sound velocity, resulting in a significant decrease in lattice thermal conductivity. Therefore, by the synergetic effect of "defect-grain boundary-core-shell-pore structure" to optimize electrical and thermal transport properties, the thermoelectric conversion efficiency was significantly improved.

Key words: titanium dioxide, defect, core-shell, pore, thermoelectric property

中图分类号:

TB34

薛静, 唐子璇, 温宇凡, 肖淑艳, 安胜利, 董忠平. 缺陷-核壳-多孔结构协同优化二氧化钛陶瓷材料的电热输运性能[J]. 无机材料学报, DOI: 10.15541/jim20260014.

XUE Jing, TANG Zixuan, WEN Yufan, XIAO Shuyan, AN Shengli, DONG Zhongping. Synergistic Optimization of Thermoelectric Transport Properties in Titanium Dioxide Ceramics via Defect-core-shell-porous Structure[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260014.

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缺陷-核壳-多孔结构协同优化二氧化钛陶瓷材料的电热输运性能

Synergistic Optimization of Thermoelectric Transport Properties in Titanium Dioxide Ceramics via Defect-core-shell-porous Structure

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