固体高分子型燃料電池電極内の濡れ性測定

抄録

To characterize the water transport properties in a proton exchange membrane fuel cell electrode, a simple capillary rise experiment is designed to measure the water uptake and to estimate the (external) contact angle to water of carbon-ionomer films. The impact of ionomer content is investigated using carbon-ionomer films with various I/C ratios ranging from 0.8 to 1.4, and the results are compared with the sessile drop measurements. The contact angles measured using the sessile drop method show a slight decrease of the contact angle with the I/C ratio. Because of large uncertainty, however, the contact angle estimated from the capillary rise experiments are unable to capture such a small variation of contact angle for the I/C ratios considered in this work.