Thermoelectric Generator Performance Evaluation of Mg3Sb0.6Bi1.4 for Low-Grade Heat Recovery

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2025-02-26 DOI:10.1021/acsaem.4c0260910.1021/acsaem.4c02609

Nirma Kumari, Amit Singh and Titas Dasgupta*,

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Abstract

Bismuth-rich compositions of Mg₃Sb_2–xBi_x can be potential low-cost replacements for Bi₂Te₃-based materials for near-room-temperature thermoelectric applications. The x = 1.4 composition, i.e., Mg₃Sb_0.6Bi_1.4, has been reported to have the best performance, and its thermoelectric generator (TEG) performance has been studied in this work. A single-leg TEG device has been fabricated using iron as the contact material. Interface studies indicate a well-bonded, crack-free joint with a low contact resistance value of 15 μΩ cm². TEG measurements have been performed with a maximum temperature gradient (ΔT) of 246 K, and a peak efficiency value of 6.5% and a power output of 64 mW have been obtained. Validation of the experimental data has been carried out using theoretical calculations based on a mixed averaging technique and indicates an acceptable match between experiment and theory. The obtained conversion efficiencies of Mg₃Sb_0.6Bi_1.4 are comparable to commercial Bi₂Te₃ modules in the ΔT range of 50–250 K, indicating their suitability for low-grade heat recovery.

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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.