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

Citation

Islam, MA and Atia, MA and Macka, M and Paull, B and Mahbub, P, Electrochemical characterisation of nanoparticulate zirconium dioxide-on-gold electrode for electrochemical detection in flow-based analytical systems, Electrochimica Acta ISSN 0013-4686 (2019) [Refereed Article]


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DOI: doi:10.1016/ j.electacta.2019.06.031

Abstract

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 Details

Item Type:Refereed Article
Keywords:electrochemical detection, flow-based analytical systems, nanomaterials, zirconium dioxide
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Electroanalytical Chemistry
Objective Division:Environment
Objective Group:Natural Hazards
Objective Field:Natural Hazards in Fresh, Ground and Surface Water Environments
UTAS Author:Islam, MA (Mr Arif Islam)
UTAS Author:Atia, MA (Mr Mostafa Atia Abuzeid)
UTAS Author:Macka, M (Professor Mirek Macka)
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Mahbub, P (Dr Parvez Mahbub)
ID Code:133133
Year Published:2019
Deposited By:Chemistry
Deposited On:2019-06-13
Last Modified:2019-06-13
Downloads:0

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