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Electrochemical characterisation of nanoparticulate zirconium dioxide-on-gold electrode for electrochemical detection in flow-based analytical systems

Islam, MA, Atia, MA, Macka, M ORCID: 0000-0002-6792-2574, Paull, B ORCID: 0000-0001-6373-6582 and Mahbub, P 2019 , 'Electrochemical characterisation of nanoparticulate zirconium dioxide-on-gold electrode for electrochemical detection in flow-based analytical systems' , Electrochimica Acta, vol. 318 , pp. 61-68 , doi: 10.1016/j.electacta.2019.06.031.

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The modification of gold (Au) electrode using zirconium dioxide nanoparticles (ZrO2 NPs) has been investigated for enhanced electrochemical (EC) detection in flow-based analytical systems. The average size of ZrO2 NPs deposited in a facile procedure on the Au electrode surface was calculated as 22.5 ± 7 nm. Redox behaviour of a test solute, ferrocyanide [Fe(CN)6]4-, on the bare- and ZrO2-Au electrodes was initially investigated using cyclic voltammetry. From the voltammograms of bare- and ZrO2-Au electrodes, the EC reversibility values and effective surface area were experimentally determined for the first-time in this study. Further, EC reversibility and 100% increase in effective electrode surface area were confirmed in ZrO2-Au electrode through investigating the detection response (current). The EC performance of the ZrO2-Au electrode was then investigated in amperometric detection of selected electroactive solutes separated by reversed-phase HPLC. The limits of detection (LODs), based upon an injection volume of 10 μL for ascorbic acid, 2,3-dihydroxybenzoic acid and pyrocatechol were 0.09 μM, 0.04 μM, and 0.10 μM, respectively (RSD 2.5%, n = 9, r2 = 0.99 for concentration range 1-100 μM). These LODs for the ZrO2-Au electrode were 2-times lower for 2,3-DHBA, and pyrocatechol than the lowest LODs reported in the literature for EC detection in HPLC. The ZrO2-Au electrode demonstrated satisfactory repeatability of preparation, detection reproducibility and high stability (8.5 h) during continuous-flow in FIA and 45 days during intermittent use with HPLC, at flow rate of 0.6 mL min-1. This work has demonstrated a comprehensive EC characterisation of Au electrode with nanoparticulate ZrO2 for flow-based analytical systems.

Item Type: Article
Authors/Creators:Islam, MA and Atia, MA and Macka, M and Paull, B and Mahbub, P
Keywords: electrochemical detection, flow-based analytical systems, nanomaterials, zirconium dioxide
Journal or Publication Title: Electrochimica Acta
Publisher: Elsevier
ISSN: 0013-4686
DOI / ID Number: 10.1016/j.electacta.2019.06.031
Copyright Information:

Copyright 2019 Elsevier Ltd.

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