About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Energy Materials for Sustainable Development
|
Presentation Title |
High Entropy Engineered Half-Heusler Thermoelectric |
Author(s) |
Subrata Ghosh, Rabeya B. Smriti, Wenjie Li, Shashank Priya, Bed Poudel |
On-Site Speaker (Planned) |
Subrata Ghosh |
Abstract Scope |
Thermoelectric generator is an eco-friendly energy conversion technology which enables the direct conversion of waste heat to electricity via Seebeck effect. The use of thermoelectric materials in solid-state devices can enhance the efficiency of fuel utilization through waste heat recovery. Half Heusler materials are potential mid-to-high temperature thermoelectric materials due to their high power-factor, but their high thermal conductivity obstructs further optimization of material’s figure of merit, zT. We have optimized the electrical and thermal transport properties of a half Heusler material through high-entropy engineering and consequently, achieved high zT (>1 at 973 K). This exceptional thermoelectric performance mainly arises from maintained high power-factor and the significantly reduced lattice thermal conductivity due to high entropy effect. Furthermore, we demonstrated excellent high thermoelectric conversion efficiency in a fabricated single-leg device of the high-entropy material. |