Electrodeposited Ni-Fe onto Glassy Carbon for the Detection of Methylene Blue

A composite electrode composed of electrodeposited, nickel-iron nanostructured clusters onto a glassy carbon (GC) disk electrode was used as a working electrode to detect methylene blue at concentrations below 10 μ M. The Ni-Fe clusters were prepared by pulse electrodeposition and a lateral composit...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2022-01, Vol.169 (1), p.12501
Main Authors: Bahrololoomi, Arash, Bilan, Hubert K., Podlaha, Elizabeth J.
Format: Article
Language:English
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Summary:A composite electrode composed of electrodeposited, nickel-iron nanostructured clusters onto a glassy carbon (GC) disk electrode was used as a working electrode to detect methylene blue at concentrations below 10 μ M. The Ni-Fe clusters were prepared by pulse electrodeposition and a lateral composition variation was observed reflective of a local pH change across the Ni-Fe feature. The applied potential for the detection of MB at a pH of 4 was determined through voltammetry, and demonstrated using chronoamperometry and electrochemical impedance spectroscopy (EIS). The adsorption of MB influenced both the capacitance, C , and ohmic resistance, R s . A peak present in i t 1 / 2 vs t chronoamperometry plots decreased with lower MB bulk concentration, while in contra s t, the R s C parameters determined from equivalent circuit models of EIS had the opposite behavior having a larger signal with lower MB concentration, and hence providing a way to increase the detection signal at lower MB concentration.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac429e