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Octacyanomolybdate-doped-poly(4-vinylpyridine) ionomer film electrode for the electrocatalytic oxidation of l-ascorbic acid

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Abstract

Poly(4-vinylpyridine) (PVP)-based anion exchange polymers are not studied as much as cation exchange polymers Nafion and Eastman Kodak AQ for electroanalytical applications. Similarly, octacyanomolybdate [Mo(CN)8 4−] has not been studied much as a redox mediator. This communication presents results from examinations of the behaviour of Mo(CN)8 4−-doped PVP ionomer film electrode to highlight the opportunities for realization of the application of this composite electrode for l-ascorbic acid (AH2) estimation via electrocatalytic mediation in acidic medium. The modified electrodes were characterized by cyclic voltammetry and rotating disc electrode voltammetry. PVP coatings possess strong anion-binding capacity for Mo(CN)8 4− mediator with an extraction coefficient of 990, and electrostatically cross-linked PVP films offer insignificant resistance to permeation of AH2, facilitating a cross-exchange reaction between the substrate and the mediator in the entire film volume. They show effective electrocatalytic oxidation of AH2, with the oxidation potential of AH2 decreased by ∼200 mV in overpotential compared to that at bare electrode. Mo(CN)8 4−/PVP composite electrode does not respond to the more common interferents of l-ascorbic acid estimation even at high positive potentials. These and several other attractive potentialities of the modified electrode are demonstrated by direct determination of AH2 in a commercial vitamin C tablet without any special treatment, with the value closely agreeing (±0.75%) with the reference method.

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Acknowledgements

We are gratefully indebted to the Council of Scientific and Industrial Research and the University Grants Commission, India, for financial support and to Prof. Isao Taniguchi of Kumamoto University, Japan, for providing facilities during the preparation of this manuscript and for helpful discussions.

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  1. R. Thangamuthu

    Present address: Department of Chemical Engineering, National Yunlin University of Science and Technology, Yunlin, Taiwan, ROC

Authors and Affiliations

  1. Department of Physical Chemistry, University of Madras, Guindy Campus, Chennai, 600 025, India

    R. Thangamuthu, S. M. Senthilkumar & K. Chandrasekara Pillai

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  1. R. Thangamuthu
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  2. S. M. Senthilkumar
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  3. K. Chandrasekara Pillai
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Correspondence to K. Chandrasekara Pillai.

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Thangamuthu, R., Senthilkumar, S.M. & Chandrasekara Pillai, K. Octacyanomolybdate-doped-poly(4-vinylpyridine) ionomer film electrode for the electrocatalytic oxidation of l-ascorbic acid. J Solid State Electrochem 11, 126–133 (2007). https://doi.org/10.1007/s10008-005-0074-y

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  • DOI: https://doi.org/10.1007/s10008-005-0074-y

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