Enhancement of Thermoelectric Properties of p-Type Bismuth Telluride Bulk Composites with Ag-TiO2 Nano Particles Spray Coating and Hot Deformation Process

11 Pages Posted: 5 Jan 2024

See all articles by Anil Kumar

Anil Kumar

Kyung Hee University - Institute of Natural Sciences

Saurabh Thoravat

Kyung Hee University - Institute of Natural Sciences

Hong Jong Jin

Research Lab., P.nut Co. Ltd.

Junyoung Park

Pohang University of Science and Technology (POSTECH)

Hyungyu Jin

Pohang University of Science and Technology (POSTECH)

Pooja Rawat

Kyung Hee University - Institute of Natural Sciences

Jong-Soo Rhyee

Kyung Hee University - Institute of Natural Sciences

Abstract

We aimed to enhance p-type Bi0.4Sb1.6Te3.4 (BST) composite's thermoelectric (TE) properties by minimizing thermal conductivity through hierarchical phonon scattering via nano Ag-coated TiO2 (Ag/TiO2). Hot deformation (HD) was employed to induce multi-scale microstructures in these high-performance p-type TE materials, increasing electrical transport properties through improved textures and donor-like effects. Our optimization strategy included creating grain boundaries, multiple phonon scattering centers, and introducing high-density lattice defects, significantly reducing lattice thermal conductivity. The combined effects led to a noticeable improvement in the figure of merit (ZT) across the temperature range, with all TE parameters measured along the in-plane direction. In the case of the hot-deformed Bi0.4Sb1.6Te3.4 alloy, the maximum ZT reached 1.31 at 350 K, while the average zT (zTavg) was 1.17 in the range of 300-400 K, suggesting promising potential for near room temperature TE power generation and solid state cooling.

Keywords: hot deformation, Spray coating, figure of merit, Hierarchical phonon scattering, thermal conductivity.

Suggested Citation

Kumar, Anil and Thoravat, Saurabh and Jin, Hong Jong and Park, Junyoung and Jin, Hyungyu and Rawat, Pooja and Rhyee, Jong-Soo, Enhancement of Thermoelectric Properties of p-Type Bismuth Telluride Bulk Composites with Ag-TiO2 Nano Particles Spray Coating and Hot Deformation Process. Available at SSRN: https://ssrn.com/abstract=4684974 or http://dx.doi.org/10.2139/ssrn.4684974

Anil Kumar

Kyung Hee University - Institute of Natural Sciences ( email )

Saurabh Thoravat

Kyung Hee University - Institute of Natural Sciences ( email )

Hong Jong Jin

Research Lab., P.nut Co. Ltd. ( email )

Junyoung Park

Pohang University of Science and Technology (POSTECH) ( email )

Hyungyu Jin

Pohang University of Science and Technology (POSTECH) ( email )

Pooja Rawat

Kyung Hee University - Institute of Natural Sciences ( email )

Jong-Soo Rhyee (Contact Author)

Kyung Hee University - Institute of Natural Sciences ( email )

Korea, Republic of (South Korea)

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