Today's unresolved issues in impedance spectroscopy are driven by the observation that impedance spectroscopy provides only an indirect characterization of a given system. A consequence of the inferential character of impedance spectroscopy is that many models can provide "fits” that fall within the apparent confidence limits of the data. Impedance spectroscopy, therefore, cannot be regarded as being a "stand-alone" technique. The non-uniqueness of impedance models is currently being addressed by incorporating independent in-situ and ex-situ analyses into impedance experiments; by varying additional parameters for forcing functions) such as temperature, mass transfer rates, energy of incident monochromatic illumination, and intensity of broad-band illumination; and by incorporating measurements of additional properties such as mass. Improvements in interpretation will also be driven by incorporation of more sophisticated statistical treatment of data and models.

Subject
Circuits, Electrochemical reactions, Structures, Impedance, Impedance spectroscopy, Extrapolation, Constants, Impedance measurements, Experimental data, Electrochemical data, Elements, Polarization resistance, Electrodes
Keywords:
electrochemical measurements, impedance spectroscopy, statistics, models
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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