High-thermoelectric performance of TiO 2-x fabricated under high pressure at high temperatures
| Autor: | Taichao Su, Yuewen Zhang, Bing Sun, Xiaopeng Jia, Binwu Liu, Baomin Liu, Hongan Ma, Lingjiao Kong, Haiqiang Liu |
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| Rok vydání: | 2017 |
| Předmět: |
Fabrication
Materials science Oxide Sintering Nanotechnology 02 engineering and technology Power factor 010402 general chemistry 01 natural sciences chemistry.chemical_compound Thermal conductivity TiO2-x Thermoelectric effect lcsh:TA401-492 Multi-scale Integrated phonon scattering business.industry Thermoelectric Metals and Alloys High temperature 021001 nanoscience & nanotechnology Thermoelectric materials 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Titanium oxide High pressure chemistry Optoelectronics lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology business |
| Zdroj: | Journal of Materiomics, Vol 3, Iss 4, Pp 286-292 (2017) |
| ISSN: | 2352-8478 |
| DOI: | 10.1016/j.jmat.2017.06.002 |
| Popis: | We present the work about the initiative fabrication of multi-scale hierarchical TiO2-x by our strategy, combining high pressure and high temperature (HPHT) reactive sintering with appropriate ratio of coarse Ti to nanosized TiO2. Ubiquitous lattice defects engineering has also been achieved in our samples by HPHT. The thermoelectric performance was significantly enhanced, and rather low thermal conductivity (1.60 W m−1 K−1) for titanium oxide was reported here for TiO1.76. Correspondingly, a high dimensionless figure of merit (zT) up to 0.33 at 700 °C was realized in it. As far as we know, this value is an enhancement of 43% of the ever best result about nonstoichiometric TiO2 and the result is also exciting for oxide thermoelectric materials. The moderate power factor, the significantly reduced thermal conductivity and the remarkable synergy between electrical properties and thermal conductivity are responsible for the excellent thermoelectric performance. We develop a facile strategy for preparing multi-scale hierarchical TiO2-x and its superior ability to optimize thermoelectric performance has been demonstrated here. |
| Databáze: | OpenAIRE |
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