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Issue 14, 2018
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High-performance thermoelectric materials based on ternary TiO2/CNT/PANI composites

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Abstract

In the present work, we report the fabrication of high-performance thermoelectric materials using TiO2/CNT/PANI ternary composites. We showed that a conductivity of ∼2730 S cm−1 can be achieved for the binary CNT (70%)/PANI (30%) composite, which is the highest recorded value for the reported CNT/PANI composites. We further demonstrated that the Seebeck coefficient of CNT/PANI composites could be enhanced by incorporating TiO2 nanoparticles into the binary CNT/PANI composites, which could be attributed to lower carrier density and the energy scattering of low-energy carriers at the interfaces of TiO2/a-CNT and TiO2/PANI. The resulting TiO2/a-CNT/PANI ternary system exhibits a higher Seebeck coefficient and enhanced thermoelectric power. Further optimization of the thermoelectric power was achieved by water treatment and by tuning the processing temperature. A high thermoelectric power factor of 114.5 μW mK−2 was obtained for the ternary composite of 30% TiO2/70% (a-CNT (70%)/PANI (30%)), which is the highest reported value among the reported PANI based ternary composites. The improvement of thermoelectric performance by incorporation of TiO2 suggests a promising approach to enhance power factor of organic thermoelectric materials by judicial tuning of the carrier concentration and electrical conductivity.

Graphical abstract: High-performance thermoelectric materials based on ternary TiO2/CNT/PANI composites

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Publication details

The article was received on 23 Nov 2017, accepted on 01 Mar 2018 and first published on 01 Mar 2018


Article type: Paper
DOI: 10.1039/C7CP07896J
Citation: Phys. Chem. Chem. Phys., 2018,20, 9411-9418
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    High-performance thermoelectric materials based on ternary TiO2/CNT/PANI composites

    F. Erden, H. Li, X. Wang, F. Wang and C. He, Phys. Chem. Chem. Phys., 2018, 20, 9411
    DOI: 10.1039/C7CP07896J

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