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- W2050647519 abstract "Theoretical calculations and experimental results have clearly demonstrated that a composite electrode should exhibit low activation polarisation by spreading the electrochemical active area within the volume of the electrode. The present modelling has been performed in order to give a complete description of such an electrode structure as well as the processes occurring therein. A one-dimension flooded homogeneous model and a microscopic approach were used. The cathode was assumed to be composed of spherical particles of ionic (YSZ) and electronic conductors (M). The porous mixture of spherical grains was described as a face-centred cubic lattice. The microstructural parameters of interest include: the electrode thickness (L), the grain diameter (dYSZ = dM = dg), the porosity (ɛ), the specific adsorption surface area (avads), the specific electrochemical surface area (avtpb), the pore diameter (dp) and the composition (ɛa). The proposed approach defines three independent parameters: ɛ, dg and ɛa. For a given electrode composition, the results suggest that the nature of the rate determining step depends on grain size. An optimised porosity value is also determined. In case of a limitation by the charge transfer step, the model predicts that grading both composition and reaction sites is effective in increasing the electrochemical performances whereas grading porosity is not beneficial." @default.
- W2050647519 created "2016-06-24" @default.
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- W2050647519 date "2005-03-01" @default.
- W2050647519 modified "2023-09-30" @default.
- W2050647519 title "Theoretical optimisation of a SOFC composite cathode" @default.
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- W2050647519 doi "https://doi.org/10.1016/j.electacta.2004.09.012" @default.
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