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000025009 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000025009 1001_ $$0P:(DE-Juel1)129670$$aVaßen, R.$$b0$$uFZJ
000025009 245__ $$aModelling of the agglomeration of Ni-particles in anodes of solid oxide fuel cells
000025009 260__ $$aDordrecht [u.a.]$$bSpringer Science + Business Media B.V$$c2001
000025009 300__ $$a147 - 151
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000025009 440_0 $$03507$$aJournal of Materials Science$$v36$$x0022-2461
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000025009 520__ $$aThe degradation of anodes of solid oxide fuel cells (SOFC), which consist of a porous metal - solid electrolyte material is described by a two particle model. The model is based on two main assumptions. Firstly, the difference in metal particle diameter is the driving force for the observed coarsening of the larger metal particle during long term annealing. Secondly, surface diffusion of metal atoms on the particle surface is the dominant diffusion mechanism. Additionally, a function was introduced which considers the limited space for the growth of the nickel particles in the cermet material. The found analytical function for the growth kinetics was compared to experimental results for the growth of nickel particles in a nickel - yttria stabilised zirconia (YSZ) anode annealed at 1000 degreesC up to 4000 h. The model describes the time dependence of the observed particle radii in an adequate way. The resultant surface diffusion coefficients for Ni are lower than results found in literature. Possible explanations are discussed. However, the result shows that the proposed mechanism - surface diffusion of nickel atoms - is fast enough to explain the found amount of Ni agglomeration in SOFC anodes and is therefore considered to be the dominant mechanism. (C) 2001 Kluwer Academic Publishers.
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000025009 536__ $$0G:(DE-Juel1)SOFC-20140602$$aSOFC - Solid Oxide Fuel Cell (SOFC-20140602)$$cSOFC-20140602$$fSOFC$$x1
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000025009 7001_ $$0P:(DE-Juel1)VDB1534$$aSimwonis, D.$$b1$$uFZJ
000025009 7001_ $$0P:(DE-Juel1)129666$$aStöver, D.$$b2$$uFZJ
000025009 773__ $$0PERI:(DE-600)2015305-3$$a10.1023/A:1004849322160$$gVol. 36, p. 147 - 151$$p147 - 151$$q36<147 - 151$$tJournal of materials science$$v36$$x0022-2461$$y2001
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000025009 9141_ $$y2001
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