A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode
AbstractThis 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. View Full-Text
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Qu, K.; Fang, M.; Zhang, S.; Liu, H.; Zeng, X. A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode. Polymers 2018, 10, 1191.
Qu K, Fang M, Zhang S, Liu H, Zeng X. A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode. Polymers. 2018; 10(11):1191.Chicago/Turabian Style
Qu, Ke; Fang, Mingxi; Zhang, Shuwei; Liu, Haiying; Zeng, Xiangqun. 2018. "A Redox Conjugated Polymer-Based All-Solid-State Reference Electrode." Polymers 10, no. 11: 1191.
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