Scanning microsensors for measurement of local pH distributions at the microscale

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837020· OSTI ID:413397

Park, J O; Paik, C H; Alkire, R C ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

Ion-selective pH microelectrodes were used to measure hydroxide ion concentration fields produced by electrochemical reduction of oxygen on 10 and 25 {micro}m Pt disk electrodes. The sensors were mounted on a scanning system, and the hydroxide concentration profiles over the disk electrodes were obtained. Data were compared with predictions based on the diffusion equation. The pH microelectrode was also used to verify the buildup of hydroxide ions generated by cathodic reaction on Al{sub 3}Fe that was in electrical contact with Al 6061 at the rest potential in 0.6 M NaCl.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-91ER45439
• OSTI ID: 413397
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 143; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ALUMINIUM BASE ALLOYS
CONCENTRATION RATIO
CORROSION PRODUCTS
ELECTROCHEMICAL CORROSION
HYDROXIDES
ION SELECTIVE ELECTRODE ANALYSIS
ION-SELECTIVE ELECTRODES
IRON ALLOYS
MONITORING
PERFORMANCE
PH VALUE