Study of Asahi Chemical Aciplex~(～R)~-S Membrane for Highl y Durable Pemfcs

摘要

The potentiality of higher EW & thinner membrane for practical use was investigated. Aciplex~(~R)-S1102 and S1201Q showed almost same cell performance with S1002. They also showed higher mechanical strength and more stable creep property in the atmosphere close to fuel cell operation compared to S1002. These indicate higher EW membranes can be candidates for durable fuel cell stack by further improvement. Though there had caused the some degradation on the border of membrane fixed and exposed portions after circumstance cycles between 80℃/95%RH and -40℃, but it was found to happen at initial cycles. Mechanical strength showed stable up to 120cycles and tanδ shifted to higher temperature, which means polymer structure became more stable. The influence of water freezing assuming winter season on mechanical properties of membrane was not recognized. Though cell performance after circumstance cycle went down by excess water existing in the MEA, it was found this can be avoided by optimizing humidification conditions.