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Citation: Xu Yi-Ting, Dai Li-Zong, He Yun-You, Tahina Rakotoartsoa, JeanYves Gal, Wu HuiHuang. Electrochemical and Electrocatalytic Properties of Polyaniline Derivatives Membrane Modified Electrode[J]. Acta Physico-Chimica Sinica, ;2003, 19(06): 564-568. doi: 10.3866/PKU.WHXB20030618 shu

Electrochemical and Electrocatalytic Properties of Polyaniline Derivatives Membrane Modified Electrode

1.
College of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen　361005; 1UMR Laboratoire Hydrosciences(CNRS, UMI, IRD). Maison des Sciences de l′Eau de Montpellier. Université Montpellier II, 34095 Montpellier Cedex 05, France

Received Date: 6 November 2002
Available Online: 15 June 2003

In this work isopropanol(iP) oxidation was adopted as a model reaction for studying the catalytic activity of poly2,5dimethylaniline (PDMAn) and polyotoluidine (POT) membrane modified electrode. Each voltammetric curve of PDMAn and POT modified electrodes has two pair of redox peaks. In comparison with platinized Pt electrode, platinized PDMAn and POT modified electrodes enhance iP oxidation current significantly, furthermore the oxidation current increase with potential cycling numbers, whereas the oxidation current at platinized Pt electrode decreases with potential cycling numbers. It is indicated that the functional membrane modified electrode exhibits higher catalytic activity to iP oxidation. POT modified electrode with low platinum loading shows great catalytic activity for iP oxidation, and has higher response sensitivity than PDMAn in the condition of low concentration iP. It is also found that PDMAn has degraded after preservation in air for three years, while POT has excellent environmental stability. Therefore, POT is promising to be an electrochemical sensor material with practical application prospect.
- Poly2,5dimethoxyaniline;Poly-o-toluidine;Stability;Polymer modified electrode;Isopropanol oxidation
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