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Improvement to the thermoelectric properties of PEDOT:PSS / JONATHAN ATOYO

Swansea University Author: JONATHAN ATOYO

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DOI (Published version): 10.23889/SUthesis.58710

Abstract

Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low a...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Carnie, Matthew
URI: https://cronfa.swan.ac.uk/Record/cronfa58710
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first_indexed 2021-11-19T13:47:34Z
last_indexed 2021-11-20T04:24:37Z
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spelling 2021-11-19T14:07:50.8588541 v2 58710 2021-11-19 Improvement to the thermoelectric properties of PEDOT:PSS bd8ea85a30ed0da5f3f47e109eb5991f JONATHAN ATOYO JONATHAN ATOYO true false 2021-11-19 Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low abundance on earth such as tellurium therefore their use and scaled production would be limited. Organic and hybrid thermoelectric materials can meet the gap for niche markets as well as be synthesized on mass, due to utilization of earth abundant elements such as carbon, sulphur, and nitrogen. The thermoelectric generators require several n and p-type materials connected for optimal efficiency. There are many ways to create inorganic thermoelectric n and p-types. However, for the organic thermoelectric materials the efficiency lags because of their lower electrical conductivity and Seebeck coefficient as well as the lack of effective strategies in the development of n-type materials. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successful and researched p-type organic thermoelectric material and thus, the thesis will explore effective strategies for decoupling the apparent trade-offs observed when improving either the electrical conductivity or Seebeck coefficient. The first major contribution to knowledge discussed in this study is the utilization of a reducing agent treatment on PEDOT-ionic liquid composites (reader is advised to refer to chapter 5). Another significant finding was the successful development of a novel route to an n-type single walled carbon nanotube, PEDOT:PSS composite (please refer to chapter 6). The final and most significant contribution to knowledge in this research project was the development of a set of novel single walled carbon nanotube, ionic liquid, PEDOT:PSS composites whereby after a post treatment with a guanidinium iodide in ethylene glycol solution allowed for improvement of the electrical conductivity from 3.4 S cm -1 to 3665 S cm-1 and Seebeck coefficient from 12 μV K-1 to 27 μV K-1 thereby leading to an optimised power factor of 236 μW m-1 K-1 at 140 °C (please refer to chapter 7). E-Thesis Swansea 19 11 2021 2021-11-19 10.23889/SUthesis.58710 ORCiD identifier: https://orcid.org/0000-0003-4220-2308 COLLEGE NANME COLLEGE CODE Swansea University Carnie, Matthew Doctoral Ph.D ESPRC (Grant number EP/N509553/1) 2021-11-19T14:07:50.8588541 2021-11-19T13:43:17.2120590 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised JONATHAN ATOYO 1 58710__21599__8365af6b4ce5498298cea6a54fc5d5f3.pdf Atoyo_Jonathan_PhD_Thesis_Final_Redacted_Signature.pdf 2021-11-19T14:02:20.9508038 Output 4537394 application/pdf E-Thesis – open access true Copyright: The author, Jonathan Atoyo, 2021. true eng
title Improvement to the thermoelectric properties of PEDOT:PSS
spellingShingle Improvement to the thermoelectric properties of PEDOT:PSS
JONATHAN ATOYO
title_short Improvement to the thermoelectric properties of PEDOT:PSS
title_full Improvement to the thermoelectric properties of PEDOT:PSS
title_fullStr Improvement to the thermoelectric properties of PEDOT:PSS
title_full_unstemmed Improvement to the thermoelectric properties of PEDOT:PSS
title_sort Improvement to the thermoelectric properties of PEDOT:PSS
author_id_str_mv bd8ea85a30ed0da5f3f47e109eb5991f
author_id_fullname_str_mv bd8ea85a30ed0da5f3f47e109eb5991f_***_JONATHAN ATOYO
author JONATHAN ATOYO
author2 JONATHAN ATOYO
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.58710
college_str Faculty of Science and Engineering
hierarchytype
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
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description Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low abundance on earth such as tellurium therefore their use and scaled production would be limited. Organic and hybrid thermoelectric materials can meet the gap for niche markets as well as be synthesized on mass, due to utilization of earth abundant elements such as carbon, sulphur, and nitrogen. The thermoelectric generators require several n and p-type materials connected for optimal efficiency. There are many ways to create inorganic thermoelectric n and p-types. However, for the organic thermoelectric materials the efficiency lags because of their lower electrical conductivity and Seebeck coefficient as well as the lack of effective strategies in the development of n-type materials. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successful and researched p-type organic thermoelectric material and thus, the thesis will explore effective strategies for decoupling the apparent trade-offs observed when improving either the electrical conductivity or Seebeck coefficient. The first major contribution to knowledge discussed in this study is the utilization of a reducing agent treatment on PEDOT-ionic liquid composites (reader is advised to refer to chapter 5). Another significant finding was the successful development of a novel route to an n-type single walled carbon nanotube, PEDOT:PSS composite (please refer to chapter 6). The final and most significant contribution to knowledge in this research project was the development of a set of novel single walled carbon nanotube, ionic liquid, PEDOT:PSS composites whereby after a post treatment with a guanidinium iodide in ethylene glycol solution allowed for improvement of the electrical conductivity from 3.4 S cm -1 to 3665 S cm-1 and Seebeck coefficient from 12 μV K-1 to 27 μV K-1 thereby leading to an optimised power factor of 236 μW m-1 K-1 at 140 °C (please refer to chapter 7).
published_date 2021-11-19T04:15:27Z
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score 11.036553

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