In the present study, the combined effect of the temperature difference across the electrode-electrolyte interface and the finite size of ions non-idealities on the cation interdiffusion is investigated using a mathematical model. Here, we build on and add significantly to our previous work1 where the study was limited only to the finite effect of ions. Considering each non-ideality/effect separately, the diffusion of manganese (Mn3+) ions decreases about 50 nm for a temperature difference (∆T) of 50 K, and 31 nm for a finite size parameter (ν) of 1.826. However, it is decreased by 54 nm considering both effects combindly for ∆T = 50 K and ν = 1.75. Further, under individual effects, the highest electric potential drop is 0.32 for a ∆T = 50 K and 0.27 for a ν = 1.75. Under combined effects, the electric potential drop is about 0.85 for ∆T = 50 K and ν = 1.75. A significant variation is observed in the diffusion of Zr4+, Y3+ and Mn3+ ions and the overall electric potential. It is anticipated that the consideration of these effects/non-idealities will help in the better understanding of cation interdiffusion, and contribute towards performance enhancement of SOFCs.
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