Standard Article

Factors influencing ionomer degradation

Advances in Electrocatalysis, Materials, Diagnostics and Durability

Conductive membranes for low-temperature fuel cells

Membrane durability

  1. M. Inaba,
  2. H. Yamada

Published Online: 15 DEC 2010

DOI: 10.1002/9780470974001.f500027

Handbook of Fuel Cells

Handbook of Fuel Cells

How to Cite

Inaba, M. and Yamada, H. 2010. Factors influencing ionomer degradation. Handbook of Fuel Cells. .

Author Information

  1. Doshisha University, Kyotanabe, Kyoto, Japan

Publication History

  1. Published Online: 15 DEC 2010


Chemical degradation of perfluorinated sulfonic acid (PFSA) membranes during operation is a serious problem to be overcome before commercialization of electric vehicles and stationary cogeneration systems based on polymer electrolyte fuel cells (PEFCs). In this article, the mechanism for peroxide/radical formation, which works as an active species for membrane degradation, in the cell is reviewed comprehensively. Accelerating factors, such as low humidification and open-circuit conditions, and the effect of air bleeding are also discussed. Finally, the chemistry of PFSA membrane degradation is outlined, together with recent improvements in the durability of PFSA membranes.


  • perfluorinated sulfonic acid membranes;
  • degradation;
  • hydrogen peroxide;
  • hydroxyl radicals;
  • platinum band;
  • gas crossover;
  • open-circuit voltage;
  • air bleeding