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Application of scanning electrochemical microscopy to studies of charge propagation within polyelectrolyte coatings on electrodes

Jeon, Il Cheol and Anson, Fred C. (1992) Application of scanning electrochemical microscopy to studies of charge propagation within polyelectrolyte coatings on electrodes. Analytical Chemistry, 64 (18). pp. 2021-2028. ISSN 0003-2700. doi:10.1021/ac00042a003. https://resolver.caltech.edu/CaltechAUTHORS:20170915-084856218

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Abstract

The technique of scanning electrochemical microscopy is used to examine the properties of polyelectrolyte coatings on electrodes. Coatings of protonated poly(4-vinytpyridine) exhibit time dependences of their redox conductivities with Fe(CN)_6^(3-) or IrCl_6^(2-) as counterions incorporated in the coatings. By contrast, responses obtained from coatings of Nafion show no comparable time dependence. A possible reason for the difference is suggested. Images of the two types of coatings obtained with the scanning electrochemical microscope include apparent topological features in the poly(4-vinytpyridine) coatings which are shown to arise from significant variations in redox conductivity across the surface of aged coatings rather than from true changes in the coating's dimension. In the case of Nafion coatings, only smooth surfaces are observed in scanning electrochemical microscope images whether they are recorded under conditions of positive or negative feedback. The absence of significant spatial variations in redox conductivity is believed to be responsible for the featureless images obtained with Nafion coatings.


Item Type:Article
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URLURL TypeDescription
https://doi.org/10.1021/ac00042a003DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ac00042a003PublisherArticle
Additional Information:© 1992 American Chemical Society. Received for review February 10, 1992. Accepted June 18, 1992. This work was supported by the National Science Foundation and the U.S. Army Research Office. I.C.J. was grateful for partial support provided by the Korean Science and Engineering Foundation. Numerous enlightening discussions with Dr. Chongmok Lee are a pleasure to acknowledge.
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Funding AgencyGrant Number
NSFUNSPECIFIED
Army Research Office (ARO)UNSPECIFIED
Korean Science and Engineering FoundationUNSPECIFIED
Issue or Number:18
DOI:10.1021/ac00042a003
Record Number:CaltechAUTHORS:20170915-084856218
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170915-084856218
Official Citation:Application of scanning electrochemical microscopy to studies of charge propagation within polyelectrolyte coatings on electrodes Il Cheol Jeon and Fred C. Anson Analytical Chemistry 1992 64 (18), 2021-2028 DOI: 10.1021/ac00042a003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81482
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Sep 2017 16:17
Last Modified:15 Nov 2021 19:43

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