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Electrochemical Oxidation and Sensing of Methylamine Gas in Room Temperature Ionic Liquids

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Open access
Authors
Murugappan, Krishnan
Kang, Colin
Silvester, Debbie
Date
2014
Type
Journal Article

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Murugappan, K. and Kang, C. and Silvester, D. 2014. Electrochemical Oxidation and Sensing of Methylamine Gas in Room Temperature Ionic Liquids. The Journal of Physical Chemistry C. 118 (33): pp. 19232-19237.
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The Journal of Physical Chemistry C
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Department of Applied Chemistry
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This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/jp5061045.

This research was supported under Australian Research Council's Discovery Early Career Research Award (project number DE120101456)

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Abstract

The electrochemical behaviour of methylamine gas in several room temperature ionic liquids (RTILs), [C2mim][NTf2], [C4mim][NTf2], [C6mim][FAP], [C4mpyrr][NTf2], [C4mim][BF4], and [C4mim][PF6] has been investigated on a Pt microelectrode using cyclic voltammetry. A broad oxidation wave at approximately 3 V, two reduction peaks and another oxidation peak was observed. A complicated mechanism is predicted based on the voltammetry obtained, with ammonia gas as a likely by-product. The currents obtained suggest that methylamine has a high solubility in RTILs, which is important for gas sensing applications. The analytical utility of methylamine was then studied in [C4mpyrr][NTf2] and [C2mim][NTf2]. A linear calibration graph with an R2 value of 0.99 and limits of detection of 33 and 34 ppm were obtained respectively, suggesting that RTILs are favourable non-volatile solvents for the electrochemical detection of highly toxic methylamine gas.