In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

Publication: Research - peer-reviewConference article – Annual report year: 2009

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Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.
Original languageEnglish
JournalE C S Transactions
Publication date2009
Volume25
Issue2
Pages1985-1992
ISSN1938-5862
DOIs
StatePublished

Conference

Conference216th ECS Meeting
Number216
CountryAustria
CityVienna
Period04/10/0909/10/09
Internet addresshttp://www.electrochem.org/meetings/biannual/216/216.htm

Bibliographical note

Copyright The Electrochemical Society, Inc. [2009]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

CitationsWeb of Science® Times Cited: 7
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