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Electro-polymerisation and characterisation of PEDOT in Lewis basic, neutral and acidic EMImCl-AlCl3 ionic liquid

Electro-polymerisation and characterisation of PEDOT in Lewis basic, neutral and acidic EMImCl-AlCl3 ionic liquid
Electro-polymerisation and characterisation of PEDOT in Lewis basic, neutral and acidic EMImCl-AlCl3 ionic liquid
This work studied the electro-polymerisation of 3,4-ethylenedioxythiophene (EDOT) and its electrochemical behavior in Lewis acidic, neutral and basic chloroaluminate ionic liquid 1-ethyl-3-methylimidazolium chloride aluminum chloride (EMImCl-AlCl3) by cyclic voltammetry. It was found that the electro-polymerisation on vitreous carbon only occurs in Lewis neutral EMImCl-AlCl3 as a dark blue-violet film whereas the electro-polymerisation in a Lewis acidic or basic compositions is not possible due to the interactions between the conductive polymer and the ionic liquid as well as the potential stability limits of the electrolyte. PEDOT films synthesised in Lewis neutral ionic liquid were tested in monomer-free Lewis acidic, basic and neutral EMImCl-AlCl3 and show different doping and de-doping behavior for chloride ionic species. The PEDOT films in a Lewis neutral composition showed higher doping levels due to the higher potential stability window, up to 2.6 V vs. Al|Al(III) than in a Lewis acidic and basic solutions. Furthermore, it was shown that the doping and de-doping levels are predefined during the electro-polymerisation of PEDOT. The anion doping and de-doping reaction reached 97% reversibility in the neutral composition, which suggests that PEDOT is a suitable electrode material to store charged species in this media and could be used in rechargeable energy storage devices.
conductive polymers, electro-polymerisation, EMImCl-AlCl3, ionic liquids, PEDOT
0013-4686
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Schoetz, Theresa
cf930a0a-087e-4be0-ac2b-614abcc3f424
Bund, A.
4ed46a72-39e2-4d2b-a5cf-0b713be53680
Ueda, M.
605dc0d5-cd98-4b87-b31b-7b308955a1d3
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Schoetz, Theresa
cf930a0a-087e-4be0-ac2b-614abcc3f424
Bund, A.
4ed46a72-39e2-4d2b-a5cf-0b713be53680
Ueda, M.
605dc0d5-cd98-4b87-b31b-7b308955a1d3

Ponce De Leon Albarran, Carlos, Schoetz, Theresa, Bund, A. and Ueda, M. (2018) Electro-polymerisation and characterisation of PEDOT in Lewis basic, neutral and acidic EMImCl-AlCl3 ionic liquid Electrochimica Acta (doi:10.1016/j.electacta.2018.01.033).

Record type: Article

Abstract

This work studied the electro-polymerisation of 3,4-ethylenedioxythiophene (EDOT) and its electrochemical behavior in Lewis acidic, neutral and basic chloroaluminate ionic liquid 1-ethyl-3-methylimidazolium chloride aluminum chloride (EMImCl-AlCl3) by cyclic voltammetry. It was found that the electro-polymerisation on vitreous carbon only occurs in Lewis neutral EMImCl-AlCl3 as a dark blue-violet film whereas the electro-polymerisation in a Lewis acidic or basic compositions is not possible due to the interactions between the conductive polymer and the ionic liquid as well as the potential stability limits of the electrolyte. PEDOT films synthesised in Lewis neutral ionic liquid were tested in monomer-free Lewis acidic, basic and neutral EMImCl-AlCl3 and show different doping and de-doping behavior for chloride ionic species. The PEDOT films in a Lewis neutral composition showed higher doping levels due to the higher potential stability window, up to 2.6 V vs. Al|Al(III) than in a Lewis acidic and basic solutions. Furthermore, it was shown that the doping and de-doping levels are predefined during the electro-polymerisation of PEDOT. The anion doping and de-doping reaction reached 97% reversibility in the neutral composition, which suggests that PEDOT is a suitable electrode material to store charged species in this media and could be used in rechargeable energy storage devices.

Text Electro-polymerisation and characterisation of PEDOT accepted copy - Accepted Manuscript
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Accepted/In Press date: 6 January 2018
e-pub ahead of print date: 9 January 2018
Keywords: conductive polymers, electro-polymerisation, EMImCl-AlCl3, ionic liquids, PEDOT

Identifiers

Local EPrints ID: 416757
URI: https://eprints.soton.ac.uk/id/eprint/416757
ISSN: 0013-4686
PURE UUID: 83b7309d-c2cc-4964-a4cd-8ed6512b5067

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Date deposited: 09 Jan 2018 17:30
Last modified: 31 Jan 2018 17:30

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