일체형 재생 연료전지용 Pt/RuO2 기반 산소극 복합 촉매 개발

초록

Pt/RuO2-based bifunctional oxygen electrode catalysts with high activity and excellent durability is developed for proton exchange membrane-based unitized regenerative fuel cell (URFC). Pt/RuO2 with relative composition of 5:5 (Pt-3/RuO2) exhibits the highest active surface area and facile polarization in both oxygen reduction and evolution reaction. Pt-3/RuO2 effectively induces 4-electron reaction in oxygen reduction and facile kinetics, as evidenced by Tafel slope of 66.65 mV and a half-wave potential of 0.723 V. Pt-3/RuO2 also shows the lowest overpotential in oxygen evolution with moderate kinetics behavior. The durability and practical applicability of the catalyst were confirmed by accelerated durability test. Pt-3/RuO2 showed the lowest decay rate in successive polarization. In URFC accelerated degradation test, Pt-3/RuO2 possessed a round-trip efficiency of 58.9% at 0.5 mA/cm2 that exceeds what has been reported in the previous research.

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