Improved Performance and Pt Reduction Technology in the Manufacturing of the MEA By Electro Spraying Process

The purpose of this study is reduction of platinum consumption without loss of performance. Electro-spraying process was selected owing to practicable mass production, direct deposition of catalyst electrode on membrane, and without Pt loss during manufacturing process. It was optimized experiments for the asymmetric MEA to Pt reduction having regard to the reaction kinetics, functional layer was applied as to do decreasing of the mass transport, and heat treatment was practiced for the stability of the electrode. That was applied to the asymmetrically MEA by electro spraying.

Using JM 40wt%. catalyst, distilled water, nafion ionomer, and isopropyl alcohol, catalyst ink was prepared with an appropriate combination ratio. Cathode was fixed Pt loading amount to 0.4mg/cm² and then asymmetric MEA was experimented by placing anode variable in 0.4, 0.3, 0.2 and 0.15mg/cm² respectively. Performance evaluation was compared with an atmospheric pressure conditions and an additional fuel pressure of 0.5bar. Experimental results from Anode 0.15/Cathode 0.4mg/cm² loading amount at 0.7V was measured power density of the 580 mW/cm² and maxpower was measured the 644mW/cm².