Reaction and flow analysis for polymer electrolyte fuel cell

In order to estimate current density distribution, which is difficult to measure experimentally, a PEFC reaction and flow analysis model was constructed based on a reaction model obtained from PEFC power generation experiments. Analysis using the model revealed the presence of a gas flow rate distribution in the separator, which was larger on the cathode side than the anode side, and that this gave rise to concentration and current density distribution. When the supply gas to the anode contained 99% hydrogen and that to the cathode 21% oxygen, the oxygen concentration overvoltage had the greatest influence on the current density distribution, and the direction of a gas flow had almost no influence on the output performance. With the model constructed in this study, it became possible to examine in detail the optimal operation conditions and the optimal form of the separator.