Open Access Repository

Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction

Islam, MA ORCID: 0000-0002-3982-5347, Koreshkova, AN, Gupta, V ORCID: 0000-0003-1458-824X, Lewis, T ORCID: 0000-0001-6891-3840, Macka, M ORCID: 0000-0002-6792-2574, Paull, B ORCID: 0000-0001-6373-6582 and Mahbub, P 2019 , 'Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction' , Electrochimica Acta, vol. 328 , pp. 1-8 , doi: 10.1016/j.electacta.2019.135087.

Full text not available from this repository.

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 Type: Article
Authors/Creators:Islam, MA and Koreshkova, AN and Gupta, V and Lewis, T and Macka, M and Paull, B and Mahbub, P
Keywords: pulsed amperometric detection and fast waveform, miniaturised flow-based electrochemical detection, hydrazine and ascorbic acid, graphene oxide reduction
Journal or Publication Title: Electrochimica Acta
Publisher: Elsevier
ISSN: 0013-4686
DOI / ID Number: 10.1016/j.electacta.2019.135087
Copyright Information:

© 2019 Elsevier Ltd. All rights reserved.

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP