Quasi-simultaneous measurements of ionic currents by vibrating probe and pH distribution by ion-selective microelectrode
authors Lamaka, SV; Taryba, M; Montemor, MF; Isaacs, HS; Ferreira, MGS
nationality International
journal ELECTROCHEMISTRY COMMUNICATIONS
author keywords SVET; Simultaneous; pH; Vibrating probe; SIET
keywords CORROSION PROTECTION; GALVANIZED STEEL; CUT EDGE; SVET; MICROSCOPY; COMPOSITES; ALUMINUM; ALLOY
abstract This work reports a new methodology to measure quasi-simultaneously the local electric fields and the distribution of specific ions in a solution via selective microelectrodes. The field produced by the net electric current was detected using the scanning vibrating electrode technique (SVET) with quasi-simultaneous measurements of pH with an ion-selective microelectrode (pH-SME). The measurements were performed in a validation cell providing a 48 mu m diameter Pt wire cross section as a source of electric current. A time lag between acquiring each current density and pH data-point was 1.5 s due to the response time of pH-SME. The quasi-simultaneous SVET-pH measurements that correlate electrochemical oxidation-reduction processes with acid-base chemical equilibria are reported for the first time. No cross-talk between the vibrating microelectrode and the ion-selective microelectrode could be detected under given experimental conditions. (C) 2010 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE INC
issn 1388-2481
year published 2011
volume 13
issue 1
beginning page 20
ending page 23
digital object identifier (doi) 10.1016/j.elecom.2010.11.002
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000286854000006
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