Overpotential suppression in high temperature PEMWE by optimization of Nafion ionomer content in anode catalyst layer

摘要

This study investigates the impact of anode and cathode Nafion ionomer content on the performance of polymer electrolyte membrane water electrolyzer at 100°C and 0.1MPa. The Nafion ionomer content varies from 5 wt.% to 30 wt.% in the both anode and cathode sides. These results showed that the anode Nafion ionomer content impacts on both linear and nonlinear overpotential; however, the cathode Nafion ionomer content only has an impact on linear overpotential. Both the anode and cathode have the same optimum Nafion ionomer content of 10 wt.%. Finally, the electrolysis current density is enlarged to 15 A/cm~2 at 2.15V with optimum Nafion ionomer content in both anode and cathode sides.