양성자교환막 수전해을 위한 다공성 금속 산화물 산소발생 촉매의 조사

Abstract

Recently, proton exchange membrane water electrolysis (PEMWE) has been attracting an attention as an energy storage using renewable electricity due to the high current operation and excellent load-following characteristics compared to the alkaline water electrolysis. Among the electrocatalytic reactions of the PEMWE, the oxygen evolution reaction (OER) at the anode has a significantly high overpotential because of the intrinsic multiple electron transfer. Thus, the catalysts for OER has been widely developed for several decades to improve the total efficiency of PEMWE. In this presentation, nanoporous RuOx-based catalysts were synthesized by various methods such as adams method, nano-template method using the ordered mesoporous silica material as a template and polymer macroparticles. The porous OER catalysts with a very high surface area over than 50 m2/g, which is changed significantly by the synthesis method, were obtained. The electrochemical surface area of the nanoporous catalysts are estimated by double layer capacitance method, which also depends on the preparation methods. RuO2 synthesized by nano-template method showed the lowest overpotential of 266 mV at 10 mA/cm2 compared to other nanoporous RuO2 synthesized by modified adams fusion methods. It will be discussed the relationship between activity toward OER and physical and electrochemical properties of the nanoporous metal oxide catalyst