음이온 교환막의 정확한 OH-전도도 및 CO2 피독 효과 분석을 위한 전기화학적 측정법
Electrochemical Method for Measurement of Hydroxide Ion Conductivity and CO2 Poisoning Behavior of Anion Exchange Membrane
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초록
알칼리막 연료전지에 사용되는 음이온 교환막은 OH-을 전달하는 역할을 하며 연료전지의 성능에많은 영향을 미친다. 따라서 음이온 교환막의 정확한 OH- 전도도를 측정하는 것은 매우 중요하다. 그러나 OH-은 대기 중의 CO2에 의해 중탄산염 형태로 쉽게 피독되어 전해질막의 정확한OH- 전도도를 측정하는 것은 매우 어렵다. 본 연구에서는 음이온 교환막의 정확한 OH- 전도도를 측정하기 위하여 전기화학적 이온교환 처리법을 검증하였다. 또한 CO2에 노출된 전해질막의거동을 OH- 전도도 변화를 통하여 확인하였다. 상용 음이온 교환 막인 Fumatech사의 FAA-3- 50과 Orion Polymer사의 Orion TM1와 함께 본 연구 그룹에서 개발한 QPP-6F를 사용하여정확한 OH- 전도도 측정 및 CO2 피독 효과에 대해서 분석하였다.
Abstract
The anion exchange membrane used in alkaline membrane fuel cells transports hydroxide ions, and ion conductivity affects fuel cell performance. Thus, the measurement of absolute hydroxide ion conductivity is essential. However, it is challenging to accurately measure hydroxide ion conductivity since hydroxide ions are easily poisoned in the form of bicarbonate by carbon dioxide in the atmosphere. In this study, we applied electrochemical ion exchange treatment to measure the absolute hydroxide ion conductivity of the anion exchange membrane. In addition, we investigated the effect of carbon dioxide poisoning of hydroxide ions on electrochemical performance by measuring bicarbonate conductivity. Commercial anion exchange membranes (FAA-3-50 and Orion TM1) and polyphenylene-based block copolymer (QPP-6F) were used.
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