title: Scanning capillary microscopy/mass spectrometry for mapping spatial electrochemical activity of electrodes.
abstract: A new technique for microscopic imaging of electrochemically active surfaces is introduced. The technique combines concepts of probe microscopy and advances in mass spectrometry. The technique is based on a miniature electrochemical flow cell scanner. A liquid feed stream containing a redox component is introduced to the vicinity of the examined location through the annulus of a coaxial capillary set. The incoming reagent interacts with the target location, and the generated product stream is transferred through the inner capillary to an electrospray mass spectrometer, ESI-MS. Thus, a multicomponent, potential-dependent image of the products' distribution versus the location on the electrode is generated. The use of the technique is demonstrated by scanning the electrochemical heterogeneity of model electrodes.
authors.affiliation: Division of Environmental Sciences, Fredy and Nadine Herrmann School of Applied Science, The Hebrew University of Jerusalem, Israel.
authors.forename: A D
authors.initials: AD
authors.lastname: Modestov
authors.forename: S
authors.initials: S
authors.lastname: Srebnik
authors.forename: O
authors.initials: O
authors.lastname: Lev
authors.forename: J
authors.initials: J
authors.lastname: Gun