Abstract
Intermediate-temperature protonic ceramic fuel cells (PCFCs) are expected to be highly efficient energy conversion devices because of their high proton conductivity in the electrolyte. However, besides the main proton conductivity, some other charge carriers, such as electron holes, are also conductive in PCFCs, leading to a decrease in current efficiency. The conductivities are not only affected by the operating temperature but are also strongly influenced by the gas concentrations, which causes complexities in PCFC performance. To reveal the performance and provide feedback to the operating condition selections considering the reaction overpotential, a quasi-two-dimensional Nernst-Planck-Poisson (NPP) numerical model was successfully used to investigate the current efficiency distribution in a planar-type PCFC electrolyte with BaZr0.8Yb0.2O3-δ (BZYb20). The influence of the gas flow direction was also revealed in the present study. The results showed almost the same average current efficiency with co- and counter-flows but flat proton distributions with counter-flows.
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