전극 촉매 물질인 페롭스카이트 형 La0.8Sr0.2CuO3 분말을 시트릭산 합성법으로 제조하였다. 이렇게 제조한 La0.8Sr0.2CuO3 분말과 지지전도체로 탄소 및 소수성 결합제로 polytetrafluoroethylene(PTFE)를 혼합하여 다공성 전극을 제조하였다. 이산화탄소를 0.1, 0.5, 1.0M KOH 전해액에 용해하여 5, 10 ℃의 반응온도에서 -1.5~-2.5 V(vs. Ag/AgCl)의 인가전위로 전기화학 실험을 수행한 결과, 액상생성물은 온도와 상관없이 메탄올, 에탄올, 2-프로판올, 1,2-부탄올이 얻어진 반면 기상생성물로는 5 ℃에서는 메탄, 에탄, 에틸렌이 10 ℃에서는 메탄, 에탄, 프로판이 생성되었다. 전체 패러데이 효율의 관점에서 CO2 환원의 최적 인가전압은 기상의 경우 높은 값을(-2.0, -2.2 V) 보였고, 액상의 경우는 전해액 농도와 반응온도에 상관없이 낮은 전압(-1.5 V)임을 알 수 있었다.

La0.8Sr0.2CuO3 powder with the perovskite structure was prepared as electrode catalyst using citrate method. Porous electrode was made with as-prepared catalyst, carbon as supporter and polytetrafluoroethylene (PTFE) as hydrophobic binder. As results of potentiostatic electrolysis with potential of -1.5~-2.5 V vs. Ag/AgCl in 0.1, 0.5 and 1.0 M KOH at 5 and 10 ℃ on the porous electrode, liquid products were methanol, ethanol, 2-propanol and 1, 2-butanol regardless reaction temperature, while gas products were methane, ethane and ethylene at 5 ℃, and methane, ethane and propane at 10 ℃ respectively. Optimal potentials for CO2 reduction in the view of over all faradic efficiency were high values (-2.0 and -2.2 V) for gas products whereas low potential (.1.5 V) for liquid products regardless of concentration and temperature.

La0.8Sr0.2CuO3 CO2 Reduction Electrochemical Reaction Perovskite Porous Electrode

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