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Simultaneous Improvement of Electrical and Thermal Transport Properties of Titanium Oxide Ceramic Thermoelectric Materials

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Abstract

Thermoelectric materials can easily realize energy savings by converting untapped waste heat into electricity. Unfortunately, however, the coupling of the thermoelectric parameters limits the conversion efficiency. Herein, we fabricated titanium oxide ceramic thermoelectric materials using a simple one-step solid-state reaction between TiO2 and starch at high temperature, and improved the electrical and thermal transport properties simultaneously by adjusting the amount of starch during preparation. With increasing starch, the electrical conductivity and power factor increased and the thermal conductivity decreased significantly. The samples mixed with 7 wt% starch showed rather low thermal conductivity (less than 2.0 W m−1 K−1) and a dimensionless figure of merit (ZT) close to 0.14K at 973 K. When the samples were sintered in an argon atmosphere, the starch was carbonized in situ into carbon and provided a reducing atmosphere, leading to the appearance of oxygen vacancies in the lattice of titanium oxide. The oxygen vacancies increased with increasing starch in the mixture during preparation, which resulted not only in a narrower band gap of titanium oxide but also enhanced phonon scattering.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant 21761027) and the Natural Science Foundation of Inner Mongolia (Grant 2020LH02006).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Arding Street No.7, Inner Mongolia, Baotou, 014010, China

    Zhongping Dong, Anyu Li, Shuyan Xiao & Shengli An

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  1. Zhongping Dong
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  2. Anyu Li
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  3. Shuyan Xiao
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  4. Shengli An
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Correspondence to Zhongping Dong.

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Dong, Z., Li, A., Xiao, S. et al. Simultaneous Improvement of Electrical and Thermal Transport Properties of Titanium Oxide Ceramic Thermoelectric Materials. J. Electron. Mater. 51, 3504–3509 (2022). https://doi.org/10.1007/s11664-022-09642-3

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