Oxygen mass transport across ionomer in polymer electrolyte fuel cells

用铂微电极电化学方法研究了氧在膜和离聚物薄膜中的传质。碳氢化合物膜的透氧率远低于全氟膜。因此，氧渗透性的改善对于烃基离聚物是重要的。研究还发现，氧气渗透厚度小于500 nm的离聚物薄膜的速率决定步骤是离聚物/气体界面处的氧气溶解速率。

Oxygen mass transport across membranes and ionomer thin films was investigated by electrochemical methods using platinum microelectrodes. The oxygen permeability in hydrocarbon membranes was much lower than that in perfluorinated membrane. Hence an improvement of oxygen permeability is important for hydrocarbon-based ionomers. It was also found that the rate-determining step in oxygen permeation across ionomer thin films of thickness thinner than 500 nm is the rate of oxygen dissolution at the ionomer/gas interface.