In:
Advanced Functional Materials, Wiley, Vol. 32, No. 35 ( 2022-08)
Kurzfassung:
The emerged strategy of entropy engineering provides new ideas for realizing high‐performance thermoelectric materials, but it is still much unresolved how to achieve delicate trade‐off between the carrier mobility m H and the lattice thermal conductivity κ ph in taking advantage of configurational entropy Δ S . Herein, the significant advances of ultralow κ ph yet decent m H in a new medium‐entropy system of well‐designed (Pb, Ge, Sb, Cd) co‐alloyed SnTe is reported. Moreover, the co‐alloying also optimizes the carrier concentration n H and promotes the valence band convergence, thereby yielding an excellent Seebeck coefficient and compensating for decreased electrical conductivity. Consequently, a high peak ZT of 1.5 at 800 K, a record average ZT of 0.84 (300−800 K), and a remarkable Vickers hardness of 134 H V are concurrently attained in Cd 0.02 (Sn 0.59 Pb 0.15 Ge 0.2 Sb 0.06 ) 0.98 Te. Benefiting from the synergistically increased ZT and mechanical strength, the fabricated 17‐couple SnTe‐based thermoelectric module exhibits a competitive conversion efficiency of 6.3% at Δ T = 350 °C. This study not only provides a paradigm of the medium‐entropy design for thermoelectric materials but also puts forward an innovative scheme for low‐grade heat harvest by SnTe‐based TE module.
Materialart:
Online-Ressource
ISSN:
1616-301X
,
1616-3028
DOI:
10.1002/adfm.202205458
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2022
ZDB Id:
2029061-5
ZDB Id:
2039420-2
SSG:
11
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