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Electrocatalysis for oxygen electrodes in fuel cells and water electrolyzers for space applicationsThe lead ruthenate pyrochlore Pb2Ru2O6.5, in both high- and low-area forms, has been characterized using thermogravimetric analysis, X-ray photoelectron spectroscopy, X-ray diffraction, cyclic voltammetry, and O2 reduction and generation kinetic-mechanistic studies. Mechanisms are proposed. Compounds in which part of the Ru is substituted with Ir have also been prepared. They exhibit somewhat better performance for O2 reduction in porous, gas-fed electrodes than the unsubstituted compound. The anodic corrosion resistance of pyrochlore-based porous electrodes was improved by using two different anionically conducting polymer overlayers, which slow down the diffusion of ruthenate and plumbate out of the electrode. The O2 generation performance was improved with both types of electrodes. With a hydrogel overlayer, the O2 reduction performance was also improved.
Document ID
19900046890
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Prakash, Jai
(Case Western Reserve Univ. Cleveland, OH, United States)
Tryk, Donald
(Case Western Reserve Univ. Cleveland, OH, United States)
Yeager, Ernest
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Journal of Power Sources
Volume: 29
ISSN: 0378-7753
Subject Category
Spacecraft Propulsion And Power
Accession Number
90A33945
Funding Number(s)
CONTRACT_GRANT: NAG3-964
Distribution Limits
Public
Copyright
Other

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