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The platinum microelectrode/Nafion interface - An electrochemical impedance spectroscopic analysis of oxygen reduction kinetics and Nafion characteristicsThe objectives of this study were to use electrochemical impedance spectroscopy (EIS) to study the oxygen-reduction reaction under lower humidification conditions than previously studied. The EIS technique permits the discrimination of electrode kinetics of oxygen reduction, mass transport of O2 in the membrane, and the electrical characteristics of the membrane. Electrode-kinetic parameters for the oxygen-reduction reaction, corrosion current densities for Pt, and double-layer capacitances were calculated. The production of water due to electrochemical reduction of oxygen greatly influenced the EIS response and the electrode kinetics at the Pt/Nafion interface. From the finite-length Warburg behavior, a measure of the diffusion coefficient of oxygen in Nafion and diffusion-layer thickness was obtained. An analysis of the EIS data in the high-frequency domain yielded membrane and interfacial characteristics such as ionic conductivity of the membrane, membrane grain-boundary capacitance and resistance, and uncompensated resistance.
Document ID
19920060876
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Parthasarathy, Arvind
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Dave, Bhasker
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Srinivasan, Supramaniam
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Appleby, John A.
(Texas A & M University College Station, United States)
Martin, Charles R.
(Colorado State University Fort Collins, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Electrochemical Society, Journal
Volume: 139
Issue: 6 Ju
ISSN: 0013-4651
Subject Category
Inorganic And Physical Chemistry
Accession Number
92A43500
Funding Number(s)
CONTRACT_GRANT: NAG9-342
Distribution Limits
Public
Copyright
Other

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