Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 786, Issue -, Pages 884-893Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.376
Keywords
Thermoelectric properties; Composites; Perovskite; Graphene; Secondary phase
Categories
Funding
- Fundamental Research Funds for the Central Universities [2232017A-07]
- Natural Science Foundation of China [51432004, 51532006, 51774096, 51871053]
- Shanghai Committee of Science and Technology [16JC1401800, 18JC1411200]
- DHU Distinguished Young Professor Program, Science and Technology Commission of Shanghai Municipality [16DZ2260601]
- 111 Project [D16002]
Ask authors/readers for more resources
As promising thermoelectric materials with great stability at high temperature, SrTiO3 based ceramics have attracted much attention, albeit the thermoelectric figure of merit remains relatively low for application. To improve the thermoelectric properties, reduced graphene oxide (RGO) is successfully incorporated into Nb-doped SrTiO3 (STNO) ceramics with Sr deficiency via a hetero-aggregation strategy followed by annealing and spark plasma sintering. The addition of RGO enhances the carrier concentration via reduction effect and increases the carrier mobility probably through lowering the double Schottky barrier at grain boundaries, resulting in highly improved electrical conductivity for the composites. Moreover, RGO also stimulates the separation of Nb rich TiO2 phase, which serves as a dispersion with low thermal conductivity to prohibit the phonon transport in the composites. Consequently, a ZT value reaching 0.22 at 800 K for the RGO/STNO nanocomposite is obtained, which is 1.8 times higher compared with the monolithic STNO. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available