Journal
ELECTROCHIMICA ACTA
Volume 51, Issue 8-9, Pages 1389-1402Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2005.02.109
Keywords
nonlinear; impedance; harmonic; NLEIS; perovskite
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This paper reports initial studies of porous La0.8Sr0.2CoO3-delta electrodes on samaria-doped ceria using nonlinear electrochemical impedance spectroscopy (NLEIS). While traditional electrochemical impedance spectroscopy (EIS) involves measuring the linear response to small-amplitude potential or current perturbations, NLEIS probes both the linear and higher harmonic contributions to the potential upon excitation by a moderately sized current modulation. We find that these higher harmonic signals often contain specific resonant features that may help distinguish nonlinear physical processes governing the electrode reaction. Results are compared to preliminary models incorporating various possible rate-limiting phenomena, including solid-state diffusion and oxygen exchange at the aas/solid interface. (c) 2005 Elsevier Ltd. All rights reserved.
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