PEFC におけるセパレータおよび MEA の構造設計への提案

抄録

Our proposal diagnostics evaluates the PEFC's transient response with a resistance polarization, an activation polarization and a diffusion polarization, and derives diagnostics parameters by analyzing this transient response. As we have already established this diagnostics system for the 25cm² PEFC single cell, we tried to elucidate the degradation factor distribution in the same electrode by applying it to the quadrisection separator. As a result, our diagnostics was able to judge the difference of the degradation factor in each section in the same electrode. Especially, the diffusion polarization depends on the current density distribution because the integrated quantity of the generated water controls the presence of the flooding generation. Moreover, because the resistance polarization at the cell center front is the highest under any condition, we have to confirm whether this tendency is a specific behavior of the cell center front.