Solid oxide fuel cells (SOFCs) are expected to be widely applicable
for both small and large-scale power generation systems. The reason
is that the SOFC is simple, highly efficient, tolerant to
impurities, and can at least partially internally reform
hydrocarbon fuels. A multi-physics, multi-scale model structure is
proposed by integrating three submodels, i.e., a macro-continuum
model, a micro-scale model (random walk model) and an
atomistic-level model. This multi-scale model has the capability of
handling transport mechanisms on different length scales at the
same time. The coarsest macro-continuum model is first proposed to
simulate all energy transport processes in an
electrolyte-/anode-supported SOFC. Then a novel micro-level model
(random walk model) is developed to investigate the electrochemical
performance in a composite electrode. Finally, a multi-scale model
by combining the developed macro-level model and micro-level model
is proposed for a lower temperature SOFC. Based on this multi-scale
model, the dependence of electrochemical performance on the global
parameters and micro-structures is assessed for the entire fuel
cell stack.
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