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    Direct detection of ammonium ion by means of oxygen electrocatalysis at a copper-polyaniline composite on a screen-printed electrode


    Zhybak, Mykhailo T. and Vagin, Mikhail Yu and Beni, Valerio and Liu, Xianjie and Dempsey, Eithne and Turner, Anthony P.F. and Korpan, Yaroslav I. (2016) Direct detection of ammonium ion by means of oxygen electrocatalysis at a copper-polyaniline composite on a screen-printed electrode. Microchimica Acta, 183. pp. 1981-1987. ISSN 1436-5073

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    Abstract

    We describe a composite material for use in electrochemical oxygen reduction. A screen-printed electrode (SPE) was consecutively modified with electrodeposited copper, a Nafion membrane and electropolymerized polyaniline (PANi) to give an electrocatalytic composite of type PANi/Nafion/Cu2O/SPE that displays good electrical conductivity at neutral pH values. It is found that the presence of ammonia causes complex formation with Cu(I), and this causes electroreduction of oxygen to result in an increased cathodic current. The finding was applied to the quantification of ammonium ions in the 1 to 1000 μM concentration range by amperometry at −0.45 V (vs. Ag/AgCl). This Faradaic phenomenon offers the advantage of direct voltammetric detection, one of the lowest known limits of detection (0.5 μM), and high sensitivity (250 mA∙M−1∙cm−2). It was applied to the determination of ammonium ion in human serum where it compared well with the photometric routine approach for clinical analysis using glutamate dehydrogenase.

    Item Type: Article
    Keywords: Conductive polymer; Nanocomposite; Amperometry; Electrochemical impedance spectroscopy; SEM; EDX; XPS; Serum analysis;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12519
    Identification Number: https://doi.org/10.1007/s00604-016-1834-3
    Depositing User: Eithne Dempsey
    Date Deposited: 05 Mar 2020 15:59
    Journal or Publication Title: Microchimica Acta
    Publisher: Springer
    Refereed: Yes
    URI:

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