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dc.contributor.authorLi, Wenjieen
dc.contributor.authorStokes, Daviden
dc.contributor.authorPoudel, Beden
dc.contributor.authorSaparamadu, Udaraen
dc.contributor.authorNozariasbmarz, Aminen
dc.contributor.authorKang, Han Byulen
dc.contributor.authorPriya, Shashanken
dc.identifier.citationLi, W.; Stokes, D.; Poudel, B.; Saparamadu, U.; Nozariasbmarz, A.; Kang, H.B.; Priya, S. High-Efficiency Skutterudite Modules at a Low Temperature Gradient. Energies 2019, 12, 4292.en
dc.description.abstractThermoelectric skutterudite materials have been widely investigated for their potential application in mid-temperature waste heat recovery that has not been efficiently utilized A large amount of research has focused on developing materials with a high thermoelectric figure of merit (zT). However, the translation of material properties to device performance has limited success. Here, we demonstrate single-filling n-type Yb0.25Fe0.25Co3.75Sb12 and multi-filling La0.7Ti0.1Ga0.1Fe2.7Co1.3Sb12 skutterudites with a maximum zT of ~1.3 at 740 K and ~0.97 at 760 K. The peak zT of skutterudites usually occurs above 800 K, but, as shown here, the shift in peak zT to lower temperatures is beneficial for enhancing conversion efficiency at a lower hot-side temperature. In this work, we have demonstrated that the Fe-substitution significantly reduces the thermal conductivity of n-type skutterudite, closer to p-type skutterudite thermal conductivity, resulting in a module that is more compatible to operate at elevated temperatures. A uni-couple skutterudite module was fabricated using a molybdenum electrode and Ga–Sn liquid metal as the thermal interface material. A conversion efficiency of 7.27% at a low temperature gradient of 366 K was achieved, which is among the highest efficiencies reported in the literature at this temperature gradient. These results highlight that peak zT shift and optimized module design can improve conversion efficiency of thermoelectric modules at a low temperature gradient.en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.subjectconversion efficiencyen
dc.subjecttemperature gradienten
dc.titleHigh-Efficiency Skutterudite Modules at a Low Temperature Gradienten
dc.typeArticle - Refereeden
dc.description.versionPublished versionen

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Creative Commons Attribution 4.0 International
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