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.
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Acknowledgments
This work was partially funded by the “SMARTCANCERSENS” project from the European Community Seventh Framework Program under the Grant Agreement PIRSES-GA-2012-318053 and by the NATO Science for Peace (SFP) Project CBP.NUKR.SFPP 984173. Authors would like to thank also Dr. Olga Beloivan and Mr. Krishnakumar Pillai for SEM and EDX measurements.
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Zhybak, M.T., Vagin, M.Y., Beni, V. et al. Direct detection of ammonium ion by means of oxygen electrocatalysis at a copper-polyaniline composite on a screen-printed electrode. Microchim Acta 183, 1981–1987 (2016). https://doi.org/10.1007/s00604-016-1834-3
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DOI: https://doi.org/10.1007/s00604-016-1834-3