Journal of Analytical Chemistry

, Volume 72, Issue 3, pp 333–341 | Cite as

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

Articles

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.

Keywords

cobalt microparticles electrocatalytic activity ascorbic acid oxidation amperometric detection 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • Merzak Doulache
    • 1
    • 2
  • Boubakeur Saidat
    • 1
  • Mohamed Trari
    • 2
  1. 1.Laboratory of Physical Chemistry of Materials (LPCM)University Amar Telidji of LaghouatLaghouatAlgeria
  2. 2.Laboratory of Storage and Valorization of Renewable Energies (LSVRE)Faculty of Chemistry (USTHB)AlgiersAlgeria

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