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https://www.ias.ac.in/article/fulltext/jcsc/121/05/0703-0709

Electrochemical sensors; methanol; polymer electrolytes; Nafion®.

A co-planar electrode device, fabricated with all electrodes (working, counter and reference) on the same face of a Nafion® polymer electrolyte membrane, is proposed for the amperometric detection of gaseous methanol using Pt as the working electrode. Clear voltammetry is obtained for methanol oxidation from its vapours in equilibrium with methanol aqueous solutions, both in the absence and presence of oxygen in the gas stream. Using an appropriate pulse sequence to keep the indicator electrode active, methanol vapours in the 1-13 Torr partial pressure range (in equilibrium with methanol aqueous solutions in the 1-10% w/w concentration range) could be determined, in a constant potential, amperometric mode. The methanol detector could be operated both in a nitrogen stream and (in what is essential for practical applications) in an air atmosphere too, with estimated detection limits of 1.2 and 1.4 Torr respectively.

K Wallgren¹ S Sotiropoulos²

1. School of Chemical, Environmental and Mining Engineering, Nottingham University, University Park, Nottingham NG7 2RD, UK
2. Chemistry Department, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece

Published

September 2009