Studies on Electrochemical and Electrocatalytic Properties of Functional Poly-2,5-dimethoxyaniline Membrane

Abstract

Abstract: Electrochemical activity of poly-2,5-dimethoxyaniline(PDMAn) is similar to parent polyaniline because of two symmetric substituted groups.Three oxidation states of PDM An can transform reversibly, known as the completely reduced leucoemeraldine(L), intermediate emeraldine(E) and the fully oxidized pernigraniline(P).In voltammograms, the L/E, E/P transformation peaks are located at 0.19 and 0.51V, respectively.Doping polymer and intrinsic polymer follow the redox transformation as LEHP and LHEHP separately.And E/P transformation peak shifts to lower potential by increasing pHvalue.In de-aerated solution the platinized polymer has an evidently catalytic activity on isopropanol oxidation.Furthermore the oxidative current enhances with increasing potential cycling numbers, whereas it decreases for platinized Pt electrode.The Pt particles not only highly disperse in PDMAn membrane, but also interact with PDMAn, resulting in changing their geometric structure and the electron properties of that metal.It is illustrated that as a catalytic system with a high catalytic and anti-poisoning activity, platinized PDMAn membrane electrode will also catalyze isopropanol oxidation in pH=4.7 buffer solution.It is pointed that PDMAn will degrade after preservation in air for three years.

Key words: Poly-2,5-dimethoxylaniline, Redox behavior, Isopropanol catalytic oxidation, Stability

CLC Number:

O657

TrendMD:

XU Yi-Ting, HE Yun-You, DAI Li-Zong, Rakotoartsoa Tahina, Gal Jean-Yves, WU Hui-Huang . Studies on Electrochemical and Electrocatalytic Properties of Functional Poly-2,5-dimethoxyaniline Membrane[J]. Chem. J. Chinese Universities, 2003, 24(10): 1915.

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Studies on Electrochemical and Electrocatalytic Properties of Functional Poly-2,5-dimethoxyaniline Membrane

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