S
Sangyeop Lee
Researcher at University of Pittsburgh
Publications - 68
Citations - 3646
Sangyeop Lee is an academic researcher from University of Pittsburgh. The author has contributed to research in topics: Proton exchange membrane fuel cell & Phonon. The author has an hindex of 27, co-authored 65 publications receiving 2992 citations. Previous affiliations of Sangyeop Lee include Massachusetts Institute of Technology & Korea Institute of Science and Technology.
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Journal ArticleDOI
Resonant bonding leads to low lattice thermal conductivity.
TL;DR: First-principles calculations reveal that long-ranged interaction along the 100-degree direction of the rocksalt structure exist in lead chalcogenides, SnTe, Bi2Te3, Bi and Sb due to the resonant bonding that is common to all of them, which explains why rocksalt IV-VI compounds have much lower thermal conductivities than zincblende III-V compounds.
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Enhanced Thermoelectric Figure of Merit of p-Type Half-Heuslers
Xiao Yan,Giri Joshi,Weishu Liu,Yucheng Lan,Hui Wang,Sangyeop Lee,Jack Simonson,S. J. Poon,Terry M. Tritt,Gang Chen,Zhifeng Ren +10 more
TL;DR: Through a nanocomposite approach using ball milling and hot pressing, a peak ZT of 0.8 at 700 °C is achieved, which is about 60% higher than the best reported 0.5 and might be good enough for consideration for waste heat recovery in car exhaust systems.
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Enhancement of thermoelectric figure-of-merit by resonant states of aluminium doping in lead selenide
Qinyong Zhang,Qinyong Zhang,Hui Wang,Weishu Liu,Hengzhi Wang,Bo Yu,Qian Zhang,Zhiting Tian,George Ni,Sangyeop Lee,Keivan Esfarjani,Gang Chen,Zhifeng Ren +12 more
TL;DR: By adding aluminium (Al) into lead selenide (PbSe), the authors successfully prepared n-type PbSe thermoelectric materials with a figure-of-merit (ZT) of 1.3 at 850 K.
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Hydrodynamic phonon transport in suspended graphene
TL;DR: It is predicted on the basis of first-principles calculations that the hydrodynamic phonon transport can occur in suspended graphene at significantly higher temperatures and wider temperature ranges than in bulk materials.
Journal ArticleDOI
Studies on the Bi2Te3–Bi2Se3–Bi2S3 system for mid-temperature thermoelectric energy conversion
Weishu Liu,Kevin Lukas,Kenneth McEnaney,Sangyeop Lee,Qian Zhang,Cyril Opeil,Gang Chen,Zhifeng Ren +7 more
TL;DR: In this paper, the leg efficiency of thermoelectric conversion for segmented elements based on these n-type materials could potentially reach 12.5% with a cold side at 25 °C and a hot side at 500 °C if appropriate p-type legs are paired.