Decoupled phononic-electronic transport in multi-phase n-type half-Heusler nanocomposites enabling efficient high temperature power generation
| Autor: | Amin Nozariasbmarz, Shashank Priya, Han Byul Kang, Jean J. Heremans, Bed Poudel, Udara Saparamadu, Wenjie Li, Min Gyu Kang, Adbhut Gupta, Heon Joong Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Nanocomposite
Materials science business.industry Mechanical Engineering Energy conversion efficiency chemistry.chemical_element 02 engineering and technology Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences chemistry Mechanics of Materials Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Optoelectronics Figure of merit General Materials Science 0210 nano-technology business |
| Zdroj: | Materials Today. 36:63-72 |
| ISSN: | 1369-7021 |
| Popis: | Strongly coupled electronic and thermal transport behavior in thermoelectric (TE) materials has limited their figure of merit (zT). Here we provide breakthrough in decoupling TE parameters in n-type (Hf0.6Zr0.4)NiSn0.99Sb0.01 half-Heusler (hH) alloys through multi-scale nanocomposite architecture comprising of tungsten nanoinclusions. The tungsten nanoparticles not only assist electron injection, thereby improving electrical conductivity, but also enhance the Seebeck coefficient through energy filtering effect. The microstructure comprises of disordered phases with varying size of microstructural features, which assists in effective scattering of heat-carrying phonons over diverse mean-free-path ranges. Cumulatively, these effects are shown to result in outstanding thermoelectric performance of zTmax ∼ 1.4 at 773 K and zTavg ∼ 0.93 between 300 and 973 K. Using this material, a TE generator is demonstrated, which exhibits high power density of 13.93 W cm−2 and conversion efficiency of 10.7% under ΔT = 674 K. The fundamental material design principle for TE nanocomposites demonstrated here can be generalized and extended to other TE systems. |
| Databáze: | OpenAIRE |
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