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Nakayama, Yusei,Katayama, Noboru,Kogoshi, Sumio The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
Evaluation of $H_2$ / air fuel cell having an anion exchange membrane with the Cole-Cole plot method has been studied. $H_2$ was supplied to the anode at a constant flow rate and air was supplied to the cathode. The Cole-Cole plots have been measured while changing the air flow rate of the cathode. The obtained Cole-Cole plots have been evaluated by using the equivalent circuit of the fuel cell to get values of the membrane resistance and the reactive resistance. The experimental results show that the membrane value was slightly increased with increasing the air flow rate. On the other hand, the reactive resistance value decreased from 434 $m{\Omega}/cm^2$ to 181 $m{\Omega}/cm^2$. And the maximum power density was increased with decreasing the reactive resistance. They reveal that more influence on the performance of AEMFC is due to the reactive resistance. Decreasing the reactive resistance would improve the performance.
Arai Hikaru,Asami Koki,Ito Hajime,Katayama Noboru 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Catalyst layers of proton exchange membrane fuel cells (PEMFC) are formed by electrospray deposition (ESD) method. The cathode catalyst layers are formed and characterized by varying the settings of the system, such as flow rate, applied voltage and the distance between the capillary and the substrate. The dryness of the aggregates during deposition is evaluated using the Damkh¨oler number (Da), and the structure of the catalyst layer is observed using SEM, which shows that the catalyst layer is porous when dry and non-porous when insufficiently dry. In the case of insufficient drying, the structure changed significantly depending on the position. Single cell tests show that the maximum power density varies from 105 to 253 mWcm-2 depending on the settings, even with the same catalyst ink and the same amount of platinum. Electrochemical impedance spectroscopy shows that the charge transfer and mass transport resistances tend to decrease with increase in Da.