A Nafion®-based co-planar electrode amperometric sensor for methanol determination in the gas phase

Journal of Chemical Sciences

K Wallgren¹  S Sotiropoulos2² 

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

关键词: Electrochemical sensors;    methanol;    polymer electrolytes;    Nafion®.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown