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dc.contributor.author |
Papadimitriou, Sofia |
|
dc.contributor.author |
Jiannakoudakis, Andreas |
|
dc.contributor.author |
Sotiropoulos, Sotiris |
|
dc.date.accessioned |
2011-02-15T11:49:32Z |
|
dc.date.available |
2011-02-15T11:49:32Z |
|
dc.date.issued |
2010 |
|
dc.identifier.isbn |
978-80-7395-348-5 (printed) |
|
dc.identifier.isbn |
978-80-7395-349-2 (on-line) |
|
dc.identifier.uri |
http://hdl.handle.net/10195/38250 |
|
dc.description.abstract |
We report on the development of a simple amperometric method for
monitoring of dissolved methanol in 0.5 M – 5 M solutions in sulfuric acid (relevant
to methanol levels in the feed of direct methanol fuel cells) using bare Pt microdisc
electrodes. The high mass transport rates of electroactive species to the microdisc
from the solution phase results in a shift of the dissolved oxygen reduction wave to
more negative potentials so that it does not interfere with the main methanol
oxidation peak at sufficiently positive potentials (+0.5 - +0.7 V vs. Ag/AgCl). For
continuous monitoring of methanol a potential sequence consisting of +1.6 V for 10s
(cleaning pulse) / 0 V for 120 s (equilibration pulse) / +0.6 V for 180 s (measurement
pulse) is applied to the indicator electrode, resulting in current-time transients that are
reproducible upon periodic application for at least 8 h. There is a square root
correlation between the oxidation current at +0.6 V and methanol concentration for
the dissolved methanol sensor in the 0.5–3 M range, in accordance with theoretical
predictions, thus excluding electrode poisoning/current saturation up to 3 M . The
detection limit was estimated as 0.19 M making this simple method applicable for
rough estimates and a crude monitoring of methanol levels. |
eng |
dc.format |
p. 153-161 |
eng |
dc.language.iso |
eng |
|
dc.publisher |
Univerzita Pardubice |
cze |
dc.relation.ispartof |
Sensing in electroanalysis. K. Vytřas, K. Kalcher, I. Švancara (Eds.). 2010, Volume 5. |
eng |
dc.rights |
open access |
eng |
dc.subject |
methanol sensor |
eng |
dc.subject |
microelectrodes |
eng |
dc.subject |
amperometric detection |
eng |
dc.title |
Amperometric detection of dissolved methanol using microelectrodes |
eng |
dc.type |
Article |
eng |
dc.peerreviewed |
yes |
eng |
dc.publicationstatus |
published |
eng |
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