Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 25, Pages 7386-7395Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.01.012
Keywords
local electrochemical impedance spectroscopy (LEIS); uniform primary current distribution; ideally polarized electrode; recessed electrode
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Local electrochemical impedance spectroscopy provides a powerful tool for the investigation of surface heterogeneities on electrode surfaces. However, measurements are greatly influenced by geometry-induced frequency dispersion. In order to account for this frequency dispersion, both simulations and experiments were performed to explore the influence of a recessed electrode on the local and global impedance response. The calculations presented here demonstrated that the depth of the recessed electrode required to achieve a uniform primary current distribution was twice the electrode radius. The calculations provide guidelines for design of LEIS measurements, and were in good agreement with results obtained for a stainless steel disk electrode in a Na2SO4 electrolyte. (c) 2008 Elsevier Ltd. All rights reserved.
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