Record high thermoelectric performance in bulk SrTiO3 via nano-scale modulation doping
| Autor: | Tongmin Wang, Jing-Feng Li, Cheng Yan Liu, Shuai Zhang, Lei Miao, Guo Hua Fan, Yan Li, Ding Nan, Qing Tan, Boyu Zhang, Xinba Yaer, Li-Dong Zhao, Jun Wang, Huijun Kang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Dopant Renewable Energy Sustainability and the Environment business.industry Metallurgy Doping Sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure Thermoelectric materials 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Thermoelectric generator chemistry Thermoelectric effect Strontium titanate Optoelectronics General Materials Science Electrical and Electronic Engineering 0210 nano-technology business |
| Zdroj: | Nano Energy. 35:387-395 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2017.04.003 |
| Popis: | Strontium titanite (SrTiO3), which is an experimentally-friendly thermoelectric material, could be a promising candidate for thermoelectric power generation applications. The theorectical study indicates the co-doping of La and Nb could enhance the thermoelectric performance, however, the thermoelectric figure of merits (ZTs) of SrTiO3 are still low because the co-doping process at nano-scale is experimentally difficult to control. Here we report a high performance SrTiO3 with La-Nb co-doping, which are prepared by a combination of hydrothermal method and high-efficiency sintering. Nano-scale co-doping is successfully modulated by hydrothermal method, and nano-inclusions precipitate during sintering process, to form complex microstructures. In this case, the electrical and thermal transport properties are optimized simultaneously by doping concentration and dopants type, resulting in a record-high ZT >0.6 at 1000−1100 K in the 10 mol% La and 10 mol% Nb doped SrTiO3 bulk materials. The nano-scale modulation doping and microstructure controlling approach validated in the present study should be also applicable for other thermoelectric materials. |
| Databáze: | OpenAIRE |
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