Ionic conductors exhibiting strong interaction with a polymer matrix under high temperatures and non-humidified conditions
발표자
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초록
내용
PA-PBI membranes are used as PEMFC polymer electrolyte membranes operating under high temperatures and non-humidified conditions. However, since the interaction between PA and PBI is weak, a large amount of phosphoric acid leaks during PEMFC operation. In this study, to solve the phosphoric acid leakage problem, we developed new ionic conductors that do not leak even under high temperatures (~200°C) and non-humidified (RH 0%) conditions. As a result, phosphoric acid-based ionic liquids and ammonium-phosphate based zwitterionic mixture were selected as candidates to replace phosphoric acid. We fabricated the polymer electrolyte membranes by doping the discovered ion conductors into an ammonium ion-based polymer matrix. As a result, the polymer electrolyte membranes exhibited excellent ionic conductivity and retention even at 0% RH and 80°C and at a high temperature of 200°C. In this presentation, we will explain the synthesis strategy and the mechanism of ionic conductivity enhancement.