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Ultralow Thermal Conductivity Achieved by All Carbon Nanocomposites for Thermoelectric Applications
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Yiqiang Zhan
Advanced Electronic Materials, Volume: 9, Issue: 7
Swansea University Authors:
Saqib Rafique, Matthew Burton, Nafiseh Badiei, Shahin Mehraban, Lijie Li
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DOI (Published version): 10.1002/aelm.202300023
Abstract
Carbon-based materials are becoming a promising candidate for thermoelectricity. Among them, graphene shows limited scope due to its ultra-high thermal conductivity (κ). To develop graphene-based thermoelectric devices, reduction of κ is highly desired while maintaining reasonably high electrical co...
| Published in: | Advanced Electronic Materials |
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| ISSN: | 2199-160X 2199-160X |
| Published: |
Wiley
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa63352 |
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| Abstract: |
Carbon-based materials are becoming a promising candidate for thermoelectricity. Among them, graphene shows limited scope due to its ultra-high thermal conductivity (κ). To develop graphene-based thermoelectric devices, reduction of κ is highly desired while maintaining reasonably high electrical conductivity (σ). Herein, multiwalled carbon nanotubes (MWCNTs) and carbon black (CB) fillers are added into few layered graphene (FLG) to produce all-carbon composites yielding ultra-low thermal conductivity (κ) desired for thermoelectric applications. The novel preparation method of pristine FLG realizes very low κ of 6.90 W m−1 K−1 at 1248 K, which further reduces to 0.57, 0.81, and 0.69 W m−1 K−1 at the same temperature for FLG + MWCNTs, FLG + CB, and FLG + MWCNTs + CB, respectively. As-prepared FLG composites also maintain reasonably high σ, whilst the Seebeck coefficient shows over a factor of five improvement after the inclusion of carbon-based fillers. Consequently, the power factor (PF) is significantly improved. The ultralow κ is attributed to the increased thermal boundary resistance among graphene sheet boundaries. The realization of ultralow κ with simultaneous improvement in Seebeck coefficients and relatively small drops in σ with a facile and unique synthesis technique, highlight the potential of these composites. |
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| Keywords: |
All-carbon, few layered graphene, thermoelectrics, ultra-low thermal conductivity |
| College: |
Faculty of Science and Engineering |
| Funders: |
Swansea University. This work was supported by the National Natural Science Foundation of China under the grant number 62274040. M.R.B. would like to acknowledge EPSRC (EP/N020863/1) and the European Regional Development Fund (c80892) through the Welsh Government for funding. M.R.B. would also like to thank EPSRC (EP/S018107/1). S.M. wishes to thank the Welsh Government, ERDF, and SMARTExpertise Wales for funding MACH1 and COMET. |
| Issue: |
7 |