Dual-Plate Gold-Gold Microtrench Electrodes for Generator-Collector Voltammetry without Supporting Electrolyte

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Title: Dual-Plate Gold-Gold Microtrench Electrodes for Generator-Collector Voltammetry without Supporting Electrolyte
Authors: Montiel López, Miguel Ángel | Iniesta, Jesus | Gross, Andrew J. | Marken, Frank
Research Group/s: Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Ionic strength | Diffusion | Feedback | Sensing | Voltammetry
Knowledge Area: Química Física
Issue Date: 10-Jan-2017
Publisher: Elsevier
Citation: Electrochimica Acta. 2017, 224: 487-495. doi:10.1016/j.electacta.2016.11.103
Abstract: A gold-gold dual-plate microtrench electrode system based on two oppositely placed gold surfaces with 5 mm length, 17 μm average depth, and 6 μm inter-electrode gap is employed in generator-collector configuration in a four-electrode cell (counter electrode, reference electrode, and two independent working electrodes denoted “generator” – with scanning potential – and “collector” – with fixed potential). The dual-plate microtrench electrodes were investigated for (i) the reduction of Ru(NH3)63+, (ii) the oxidation of ferrocenemethanol, and (iii) the oxidation of iodide in aqueous media, all as a function of supporting electrolyte concentration. It is shown that due to the inter-electrode feedback character of the generator-collector currents, well-defined steady state sensor responses are obtained for the collector electrode even in the absence of added electrolyte. The variation in the mass transport limited steady state current (measured at the collector electrode) with addition/removal of supporting electrolyte remains low (compared to unexpectedly stronger effects caused by the switch between reduction and oxidation conditions at the collector electrode). Microtrench electrode systems are suggested for sensing applications without/with varying levels of supporting electrolyte.
Sponsor: A.J.G and F.M gratefully acknowledge the Engineering and Physical Sciences Research Council (EP/I028706/1) for financial support. M.A.M and J.I. thank the MICINN-FEDER for financial support (CTQ2013-48280-C3-3-R).
URI: http://hdl.handle.net/10045/80807
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2016.11.103
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.electacta.2016.11.103
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