Loughborough University
Leicestershire, UK
LE11 3TU
+44 (0)1509 263171
Loughborough University

Loughborough University Institutional Repository

Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/11442

Title: AC impedance characteristics of solid-state planar electrochemical carbon monoxide sensors with Nafion ® as solid polymer electrolyte
Authors: Mortimer, Roger J.
Beech, Alison
Keywords: Carbon monoxide
Nafion ®
AC impedance
Issue Date: 2002
Publisher: © Elsevier Science
Citation: MORTIMER, R.J. and BEECH, A., 2002. AC impedance characteristics of solid-state planar electrochemical carbon monoxide sensors with Nafion ® as solid polymer electrolyte. Electrochimica Acta, 47 (20), pp. 3383 - 3387
Abstract: The AC impedance characteristics of planar solid-state electrochemical carbon monoxide (CO) sensors with Nafion® as the solid polymer electrolyte are reported. For a re-cast Nafion® sensor design, Nyquist plots indicated very high impedances (107–108 Ω), which slightly decreased with an increase in the working electrode surface area (0.25–0.50 cm2). Only one enlarged semi-circle was observed, relating to an equivalent circuit with a geometrical capacitance (Cg) in parallel with a bulk resistance (Rb). In contrast, a sensor design using a commercial membrane produced a system with a much lower impedance (<103 Ω), with Nyquist plots showing a flattened semi-circle at high frequencies (due to Cg and Rb in parallel), followed by the start of a large semi-circle (due to the double-layer capacitance, Cdl, in parallel with the charge-transfer resistance, Rct) over a lower frequency range. On addition of CO, the second circular arc reduced in size, indicating that the interfacial impedance of the electrochemical system had decreased.
Description: This article was published in the journal Electrochimica Acta [© Elsever Science]. The definitive version is available at: http://dx.doi.org/10.1016/S0013-4686(02)00275-X
Version: Accepted for publication
DOI: 10.1016/S0013-4686(02)00275-X
URI: https://dspace.lboro.ac.uk/2134/11442
Publisher Link: http://dx.doi.org/10.1016/S0013-4686(02)00275-X
ISSN: 0013-4686
Appears in Collections:Published Articles (Chemistry)

Files associated with this item:

File Description SizeFormat
Electrochimica Acta 47 (2002) 3383-3387 pre-print.pdf131.25 kBAdobe PDFView/Open


SFX Query

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.