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A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode

This work reports the design, synthesis, and characterization of a novel redox-active conjugated polyaniline containing quinone moiety as a solid state reference electrode. The union of electro-active quinone with π-conjugated polyaniline was created by the first chemical synthesis of para-dimethoxy...

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Detalles Bibliográficos
Autores principales: Qu, Ke, Fang, Mingxi, Zhang, Shuwei, Liu, Haiying, Zeng, Xiangqun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6290589/
https://www.ncbi.nlm.nih.gov/pubmed/30961116
http://dx.doi.org/10.3390/polym10111191
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author Qu, Ke
Fang, Mingxi
Zhang, Shuwei
Liu, Haiying
Zeng, Xiangqun
author_facet Qu, Ke
Fang, Mingxi
Zhang, Shuwei
Liu, Haiying
Zeng, Xiangqun
author_sort Qu, Ke
collection PubMed
description This work reports the design, synthesis, and characterization of a novel redox-active conjugated polyaniline containing quinone moiety as a solid state reference electrode. The union of electro-active quinone with π-conjugated polyaniline was created by the first chemical synthesis of para-dimethoxybenzene-functionalized aniline as a monomer using a palladium-mediated coupling. The successful polymerization of the as-prepared monomer was accomplished without acid additives. Its post-polymerization modification with strong Lewis acid boron tribromide furnished unique poly (aniline quinone/hydroquinone) with desired properties for all-solid-state reference electrode (RE) applications. The electrochemical responses from the conjugated polyaniline backbone in this unique polymer have been “suppressed” by the quinone pendant. The resulting poly (aniline quinone) showed a quasi-reversible redox process from the redox behavior of the pendant quinone. The stable electrode potential of this poly (aniline quinone/hydroquinone) suggested that it was a single phase in which the amounts of totally reduced and totally oxidized species could be maintained at a constant in various solvents and electrolytes. Its electrochemical stability was excellent with 95% peak current retention after continuous cyclic voltammetric testing. The aniline and quinone moieties in poly (aniline quinone/hydroquinone) render it to have both hydrophilic and hydrophobic compatibility. It showed excellent behavior as a reference electrode in aqueous and non-aqueous media and can be used in both non-zero current and zero-current conditions, providing a stable potential with a maximum potential drift of ~4.7 mV over ten consecutive days.
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spelling pubmed-62905892019-04-02 A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode Qu, Ke Fang, Mingxi Zhang, Shuwei Liu, Haiying Zeng, Xiangqun Polymers (Basel) Article This work reports the design, synthesis, and characterization of a novel redox-active conjugated polyaniline containing quinone moiety as a solid state reference electrode. The union of electro-active quinone with π-conjugated polyaniline was created by the first chemical synthesis of para-dimethoxybenzene-functionalized aniline as a monomer using a palladium-mediated coupling. The successful polymerization of the as-prepared monomer was accomplished without acid additives. Its post-polymerization modification with strong Lewis acid boron tribromide furnished unique poly (aniline quinone/hydroquinone) with desired properties for all-solid-state reference electrode (RE) applications. The electrochemical responses from the conjugated polyaniline backbone in this unique polymer have been “suppressed” by the quinone pendant. The resulting poly (aniline quinone) showed a quasi-reversible redox process from the redox behavior of the pendant quinone. The stable electrode potential of this poly (aniline quinone/hydroquinone) suggested that it was a single phase in which the amounts of totally reduced and totally oxidized species could be maintained at a constant in various solvents and electrolytes. Its electrochemical stability was excellent with 95% peak current retention after continuous cyclic voltammetric testing. The aniline and quinone moieties in poly (aniline quinone/hydroquinone) render it to have both hydrophilic and hydrophobic compatibility. It showed excellent behavior as a reference electrode in aqueous and non-aqueous media and can be used in both non-zero current and zero-current conditions, providing a stable potential with a maximum potential drift of ~4.7 mV over ten consecutive days. MDPI 2018-10-25 /pmc/articles/PMC6290589/ /pubmed/30961116 http://dx.doi.org/10.3390/polym10111191 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Qu, Ke
Fang, Mingxi
Zhang, Shuwei
Liu, Haiying
Zeng, Xiangqun
A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title_full A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title_fullStr A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title_full_unstemmed A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title_short A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
title_sort redox conjugated polymer-based all-solid-state reference electrode
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6290589/
https://www.ncbi.nlm.nih.gov/pubmed/30961116
http://dx.doi.org/10.3390/polym10111191
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