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Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction
Citation
Islam, MA and Koreshkova, AN and Gupta, V and Lewis, T and Macka, M and Paull, B and Mahbub, P, Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction, Electrochimica Acta, 328 Article 135087. ISSN 0013-4686 (2019) [Refereed Article]
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DOI: doi:10.1016/j.electacta.2019.135087
Abstract
A fast pulsed waveform (2-steps at +400 mV and −400 mV, 10 ms each, 50 Hz cycle repetition) was developed incorporated within a miniaturised EC detector, and used to demonstrate the pulsed amperometric detection (PAD) of hydrazine in a flow-based analytical system. In contrast to standard amperometric detection (AD), a subsequent surface oxide reduction step was applied within the PAD waveform. The PAD applied within a simple flow-injection analysis (FIA) method provided a limit of detection (LOD) just as low as 0.8 nM of hydrazine (RSD 5%, n = 9, linearity r2 = 0.99 for 1 nM-100 μM), which is one order of magnitude lower than the lowest LOD reported todate. Significantly, the LOD was obtained using 5–20 times lower electrode surface area, flow rate, and sample volume, than in previous methods, with 15 times faster cycle repetition frequency than alternative PAD based studies reported in literature. Practical application of the PAD waveform was demonstrated by monitoring the temporal consumption of reducing agents during graphene oxide reduction experiments, separated using chromatographic methods (hydrazine in IC and ascorbic acid in HPLC).
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | pulsed amperometric detection and fast waveform, miniaturised flow-based electrochemical detection, hydrazine and ascorbic acid, graphene oxide reduction |
| Research Division: | Chemical Sciences |
| Research Group: | Physical Chemistry (incl. Structural) |
| Research Field: | Electrochemistry |
| Objective Division: | Manufacturing |
| Objective Group: | Industrial Chemicals and Related Products |
| Objective Field: | Industrial Chemicals and Related Products not elsewhere classified |
| UTAS Author: | Islam, MA (Mr Arif Islam) |
| UTAS Author: | Koreshkova, AN (Ms Aleksandra Koreshkova) |
| UTAS Author: | Gupta, V (Dr Vipul Gupta) |
| UTAS Author: | Lewis, T (Associate Professor Trevor Lewis) |
| UTAS Author: | Macka, M (Professor Mirek Macka) |
| UTAS Author: | Paull, B (Professor Brett Paull) |
| UTAS Author: | Mahbub, P (Dr Parvez Mahbub) |
| ID Code: | 135449 |
| Year Published: | 2019 |
| Deposited By: | Chemistry |
| Deposited On: | 2019-10-21 |
| Last Modified: | 2019-12-24 |
| Downloads: | 0 |
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