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2005
DOI: 10.1149/1.2048228
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The Mechanism Behind Redox Instability of Anodes in High-Temperature SOFCs

Abstract: Bulk expansion of the anode upon oxidation is considered to be responsible for the lack of redox stability in high-temperature solid oxide fuel cells ͑SOFCs͒. The bulk expansion of nickel-yttria stabilized zirconia ͑YSZ͒ anode materials was measured by dilatometry as a function of sample geometry, ceramic component, temperature, and temperature cycling. The strength of the ceramic network and the degree of Ni redistribution appeared to be key parameters of the redox behavior. A model of the redox mechanism in … Show more

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Cited by 143 publications
(135 citation statements)
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“…[5][6][7][8] The degradation has been attributed to changes on the microstructural level. 9 Conventional light microscopy and scanning electron microscopy ͑SEM͒ are restricted to microstructure studies of tested samples. For detectable changes to occur, the investigations are limited to redox cycled samples or samples tested for thousands of hours.…”
mentioning
confidence: 99%
“…[5][6][7][8] The degradation has been attributed to changes on the microstructural level. 9 Conventional light microscopy and scanning electron microscopy ͑SEM͒ are restricted to microstructure studies of tested samples. For detectable changes to occur, the investigations are limited to redox cycled samples or samples tested for thousands of hours.…”
mentioning
confidence: 99%
“…Another degradation problem for the Ni-YSZ electrode is the reoxidation (redox) behavior. If a Ni-YSZ electrode is subjected to an oxidizing atmosphere at a high temperature, Ni will oxidize to form NiO, which can result in a greater risk of mechanical failure of the YSZ structure [Klemensø et al 2005 andMorgensen 2007]. It is therefore important to have a continued stable fuel gas supply and to avoid oxidation of the hydrogen electrode.…”
Section: Steam/hydrogen Electrode Degradationmentioning
confidence: 99%
“…Esta es una reacción limpia, en la que el único producto es el vapor de agua que puede ser liberado a la atmósfera sin ningún peligro para el medioambiente. Son sistemas de bajo impacto ambiental, debido a que la emisión de contaminantes, como el CO 2 , SO x , NO x , hidrocarburos y otras partículas (que pueden aparecer cuando el combustible utilizado es un hidrocarburo) es mucho menor que cuando se genera energía a partir de la combustión tradicional de hidrocarburos. Además, la emisión de contaminantes es nula cuando se utiliza H 2 como combustible.…”
Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified