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Electrocatalytic performance of cobalt microparticles film-modified platinum disk electrode for amperometric detection of ascorbic acid

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Abstract

Deposited cobalt microparticales (Co-MPs) film onto the platinum disk electrode has been successfully used as a new amperometric sensor for the determination of ascorbic acid (AA). AA is detected by surface catalyzed oxidation involving cobalt(III) oxyhydroxides in alkaline solution. The Co-MPs/Pt electrode exhibits a high electrocatalytic activity toward the AA oxidation. The diffusion coefficient of AA (6.09 × 105 cm2/s) and the catalytic rate constant (k cat = 6.27 × 103 M–1s–1) have been determined using electrochemical approaches. The amperometric response of the modified electrode is linear against the AA concentration in the range (0.01‒0.48 mM). The sensor displays the best activity with a high response signal, a good sensitivity of 74.3 μA/mM, a low detection limit of 2.5 μM (signal/noise = 3) and a fast response time (<3 s). Moreover, the reproducibility, selectivity and applicability of this biosensor are satisfactorily evaluated.

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Authors and Affiliations

  1. Laboratory of Physical Chemistry of Materials (LPCM), University Amar Telidji of Laghouat, BP 37G, Ghardaïa Road, 03000, Laghouat, Algeria

    Merzak Doulache & Boubakeur Saidat

  2. Laboratory of Storage and Valorization of Renewable Energies (LSVRE), Faculty of Chemistry (USTHB), BP 32, El Alia, 16111, Algiers, Algeria

    Merzak Doulache & Mohamed Trari

Authors
  1. Merzak Doulache
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  2. Boubakeur Saidat
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  3. Mohamed Trari
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Correspondence to Merzak Doulache.

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Doulache, M., Saidat, B. & Trari, M. Electrocatalytic performance of cobalt microparticles film-modified platinum disk electrode for amperometric detection of ascorbic acid. J Anal Chem 72, 333–341 (2017). https://doi.org/10.1134/S106193481703008X

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  • DOI: https://doi.org/10.1134/S106193481703008X

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