Synthesis and characterisation of Ni-SrCe0.9Yb0.1O3-delta cermet anodes for protonic ceramic fuel cells
authors Mather, GC; Figueiredo, FM; Fagg, DP; Norby, T; Jurado, JR; Frade, JR
nationality International
journal SOLID STATE IONICS
author keywords combustion synthesis; cermets; ceramic proton conductors; anode materials
keywords COMBUSTION SYNTHESIS; NONSTOICHIOMETRY; ELECTROLYTE; CONDUCTORS
abstract Cermet anode material with a proton-conducting ceramic phase, Ni-SrCe0.9Yb0.1O3 (-) (delta), was syrithesised by-combustion from mixtures of molten nitrates and urea followed by sintering and reduction. Co-pressing the anode combustion powder on "green" SrCe0.9Yb0.1O3-delta electrolyte and co-firing produced symmetrical anode/electrolyte/anode assemblies with planar electrodes of thickness ca. 100 mum. The addition of Co(NO3)(2) . 6H(2)O to the electrolyte as sintering aid lowered the sintering temperature to 1250 degreesC, thereby allowing high anode porosity while retaining good. anode/electrolyte adherence. The anode microstructure is composed of a uniform distribution of submicron Ni and perovskite particles. Analysis of the symmetrical assemblies by a.c. impedance spectroscopy indicates that the electrode polarisation resistances are composed of at least two contributions. Stability issues concerning the Ni-SrCe0.9Yb0.1O3 - delta anodes in reducing atmospheres are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2003
volume 158
issue 3-4
beginning page 333
ending page 342
digital object identifier (doi) 10.1016/S0167-2738(02)00904-9
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000181482100015
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