A robust thermoelectric module based on MgAgSb/Mg3(Sb,Bi)2 with a conversion efficiency of 8.5% and a maximum cooling of 72 K

Ying P, Wilkens L, Reith H, Rodriguez NP, Hong X, Lu Q, Hess C, Nielsch K, He R (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Energy and Environmental Science Royal Society of Chemistry

Book Volume: 15

Pages Range: 2557-2566

Journal Issue: 6

DOI: 10.1039/d2ee00883a

Abstract

The applications of thermoelectric (TE) technology around room temperature are monopolized by bismuth telluride (Bi2Te3). However, due to the toxicity and scarcity of tellurium (Te), it is vital to develop a next-generation technology to mitigate the potential bottleneck in raw material supply for a sustainable future. Hereby, we develop a Te-free n-type compound Mg3Sb0.6Bi1.4 for near-room-temperature applications. A higher sintering temperature of up to 1073 K is found to be beneficial for reducing the electrical resistivity, but only if Mg is heavily overcompensated in the initial stoichiometry. The optimizations of processing and doping yield a high average zT of 1.1 in between 300 K and 573 K. Together with the p-type MgAgSb, we demonstrate module-level conversion efficiencies of 3% and 8.5% under temperature differences of 75 K and 260 K, respectively, and concomitantly a maximum cooling of 72 K when the module is used as a cooler. Besides, the module displays exceptional thermal robustness with a < 10% loss of the output power after thermal cycling for ∼32 000 times between 323 K and 500 K. These proof-of-principle demonstrations will pave the way for robust, high-performance, and sustainable solid-state power generation and cooling to substitute highly scarce and toxic Bi2Te3

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden

Germany (DE)

How to cite

APA:

Ying, P., Wilkens, L., Reith, H., Rodriguez, N.P., Hong, X., Lu, Q.,... He, R. (2022). A robust thermoelectric module based on MgAgSb/Mg3(Sb,Bi)2 with a conversion efficiency of 8.5% and a maximum cooling of 72 K. Energy and Environmental Science, 15(6), 2557-2566. https://doi.org/10.1039/d2ee00883a

MLA:

Ying, Pingjun, et al. "A robust thermoelectric module based on MgAgSb/Mg3(Sb,Bi)2 with a conversion efficiency of 8.5% and a maximum cooling of 72 K." Energy and Environmental Science 15.6 (2022): 2557-2566.

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