journal article·2023-04Open access

Selective Dissolution‐Derived Nanoporous Design of Impurity‐Free Bi2Te3 Alloys with High Thermoelectric Performance

Seunghyeok Lee, Sung‐Jin Jung, Gwang Min Park, Min Young Na, Kwang‐Chon Kim, Junpyo Hong, Albert S. Lee, Seung‐Hyub Baek, Heesuk Kim, Tae Joo Park, Jin‐Sang Kim, Seong Keun Kim

Small· Volume 19· Issue 14

Abstract

Abstract Thermoelectric technology, which has been receiving attention as a sustainable energy source, has limited applications because of its relatively low conversion efficiency. To broaden their application scope, thermoelectric materials require a high dimensionless figure of merit (ZT). Porous structuring of a thermoelectric material is a promising approach to enhance ZT by reducing its thermal conductivity. However, nanopores do not form in thermoelectric materials in a straightforward manner; impurities are also likely to be present in thermoelectric materials. Here, a simple but effective way to synthesize impurity‐free nanoporous Bi0.4Sb1.6Te3 via the use of nanoporous raw powder, which is scalably formed by the selective dissolution of KCl after collision between Bi0.4Sb1.6Te3 and KCl powders, is proposed. This approach creates abundant nanopores, which effectively scatter phonons, thereby reducing the lattice thermal conductivity by 33% from 0.55 to 0.37 W m−1 K−1. Benefitting from the optimized porous structure, porous Bi0.4Sb1.6Te3 achieves a high ZT of 1.41 in the temperature range of 333–373 K, and an excellent average ZT of 1.34 over a wide temperature range of 298–473 K. This study provides a facile and scalable method for developing high thermoelectric performance Bi2Te3‐based alloys that can be further applied to other thermoelectric materials.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Radiation and Cooling Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Electronic Materials Research Center Korea Institute of Science and Technology Seoul Seoul 02792 South Korea

Department of Materials Science and Chemical Engineering Hanyang University Ansan 15588 South Korea

KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 South Korea

Advanced Analysis and Data Center Korea Institute of Science and Technology Seoul 02792 South Korea

Materials Architecturing Research Center Korea Institute of Science and Technology Seoul 02792 South Korea

Convergence Research Center for Solutions to Electromagnetic Interference in Future‐mobility Korea Institute of Science and Technology Seoul 02792 South Korea

Department of Materials Science and Engineering Yonsei University Seoul 03722 South Korea

Yonsei‐KIST Convergence Research Institute Seoul 02792 South Korea

Nanomaterials Science & Engineering KIST School Korea University of Science and Technology Seoul 02792 South Korea

Soft Hybrid Materials Research Center Korea Institute of Science and Technology Seoul 02792 South Korea

Institute of Advanced Composite Materials Korea Institute of Science and Technology Wanju 55324 South Korea

Funding

National Research Foundation of Korea · National Research Council of Science and Technology · KU-KIST Graduate School of Converging Science and Technology

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