Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices

Mulla, Rafiq; Dunnill, Charlie

doi:10.1016/j.coco.2020.04.011

Journal article 520 views 312 downloads

Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices

Rafiq Mulla, Charlie Dunnill

Composites Communications, Volume: 20, Start page: 100345

Swansea University Authors: Rafiq Mulla, Charlie Dunnill

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DOI (Published version): 10.1016/j.coco.2020.04.011

Abstract

The high porosity of thermoelectric materials is a valuable feature to ideally reduce thermal conductivity without degrading electrical conductivity. This paper describes a unique low-temperature and direct method for making highly porous yet solid graphite pellets. Cotton wools were loaded with gra...

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Published in:	Composites Communications
ISSN:	2452-2139
Published:	Elsevier BV 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa54022
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first_indexed	2020-04-23T13:23:06Z
last_indexed	2023-01-11T14:31:52Z
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spelling	v2 54022 2020-04-23 Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices 1a1c32917f31df48a473a4f846068035 Rafiq Mulla Rafiq Mulla true false 0c4af8958eda0d2e914a5edc3210cd9e 0000-0003-4052-6931 Charlie Dunnill Charlie Dunnill true false 2020-04-23 CHEG The high porosity of thermoelectric materials is a valuable feature to ideally reduce thermal conductivity without degrading electrical conductivity. This paper describes a unique low-temperature and direct method for making highly porous yet solid graphite pellets. Cotton wools were loaded with graphite particles, and pressed to yield low-density graphite pellets. The electrical and thermal properties of the resulting pellets have been studied. A significant reduction in the heat flow through the pellets has been observed as compared to a pure graphite pellet. For the porous pellets, the electrical conductivity was slightly lower than that of pure graphite pellets due to the charge scattering processes of the highly porous network, yet the thermal conductivity was drastically reduced with enhancements in Seebeck coefficients hence, a significant improvement in the thermoelectric property. Overall, the power factor was found to increase from 0.303 μWm−1K−2 for solid graphite pellet to 0.424 μWm−1K−2 for porous graphite pellet, showing a simultaneously improved power factor and reduced thermal conductance. The approach can be extended for other good thermoelectric materials to achieve further enhancements in their properties and useful to reduce material cost. Journal Article Composites Communications 20 100345 Elsevier BV 2452-2139 Thermoelectric, Porous graphite, Green method, Cotton wool fibres 1 8 2020 2020-08-01 10.1016/j.coco.2020.04.011 http://dx.doi.org/10.1016/j.coco.2020.04.011 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2023-06-02T15:33:30.2184194 2020-04-23T09:49:09.7668823 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Rafiq Mulla 1 Charlie Dunnill 0000-0003-4052-6931 2 54022__17117__d83a2411426e4eaca82b3c7d99fd9fc0.pdf 54022.pdf 2020-04-23T09:52:42.0585268 Output 9772661 application/pdf Accepted Manuscript true 2021-04-22T00:00:00.0000000 © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
spellingShingle	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices Rafiq Mulla Charlie Dunnill
title_short	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
title_full	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
title_fullStr	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
title_full_unstemmed	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
title_sort	Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices
author_id_str_mv	1a1c32917f31df48a473a4f846068035 0c4af8958eda0d2e914a5edc3210cd9e
author_id_fullname_str_mv	1a1c32917f31df48a473a4f846068035_*_Rafiq Mulla 0c4af8958eda0d2e914a5edc3210cd9e_*_Charlie Dunnill
author	Rafiq Mulla Charlie Dunnill
author2	Rafiq Mulla Charlie Dunnill
format	Journal article
container_title	Composites Communications
container_volume	20
container_start_page	100345
publishDate	2020
institution	Swansea University
issn	2452-2139
doi_str_mv	10.1016/j.coco.2020.04.011
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
url	http://dx.doi.org/10.1016/j.coco.2020.04.011
document_store_str	1
active_str	0
description	The high porosity of thermoelectric materials is a valuable feature to ideally reduce thermal conductivity without degrading electrical conductivity. This paper describes a unique low-temperature and direct method for making highly porous yet solid graphite pellets. Cotton wools were loaded with graphite particles, and pressed to yield low-density graphite pellets. The electrical and thermal properties of the resulting pellets have been studied. A significant reduction in the heat flow through the pellets has been observed as compared to a pure graphite pellet. For the porous pellets, the electrical conductivity was slightly lower than that of pure graphite pellets due to the charge scattering processes of the highly porous network, yet the thermal conductivity was drastically reduced with enhancements in Seebeck coefficients hence, a significant improvement in the thermoelectric property. Overall, the power factor was found to increase from 0.303 μWm−1K−2 for solid graphite pellet to 0.424 μWm−1K−2 for porous graphite pellet, showing a simultaneously improved power factor and reduced thermal conductance. The approach can be extended for other good thermoelectric materials to achieve further enhancements in their properties and useful to reduce material cost.
published_date	2020-08-01T15:33:28Z
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score	11.035655

Graphite-loaded cotton wool: A green route to highly-porous and solid graphite pellets for thermoelectric devices

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