固体高分子形燃料電池のエクセルギー解析

―構造最適化に向けて―

抄録

Energy losses inherit in PEFC structure was analyzed to find optimum cell structure. As for a representative cell, JARI cell was examined and analyzed with simple model. In the model, the losses are calculated with distinguishing current loss, mass transport loss, heat flow loss, which are irreversible losses when current, mass transport and heat flow occur in cell. Loss analysis found that current loss, in particular activation overvoltage, is the largest of the components, and current loss determines the efficiency of the fuel cell. An enlarged electrode area embedded in the cell was proposed to reduce the current loss. Since there is a trade-off relationship between the three losses, we calculated the electrode area so that the total loss is minimized. We also examined the effect of expanding the electrode area on the output density.