코발트와 나이오븀이 코팅된 NiO 용융탄산염 연료전지 양극물질 특성 연구
Characterization of (Co/Nb)-coated NiO as a Cathode Material for Molten Carbonate Fuel Cells
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초록
용융탄산염 연료전지(MCFC)의 양극으로 사용되는 NiO는 650oC의 용융탄산염과 산소 분위기조건에서 안정하고 높은 전기 전도도를 가지는 장점이 있다. 그러나, 장시간 운전 시 양극에서전해질로의 Ni dissolution은 전지 내부의 단락을 초래하여 전지의 수명을 단축시킨다. 본 연구에서는 대체 전극물질로서 코발트와 나이오븀을 코팅시킨 NiO 전극을 제조하였으며, 이렇게 제조된 전극은 기존 NiO전극과 비교하여 낮은 Ni dissolution과 안정되고 우수한 전기화학 성능을보임을 확인하였다.
Abstract
NiO is commonly used as the cathode for the molten carbonate fuel cell due to its stability and high electrical conductivity in molten carbonates and oxygen atmosphere. However,long-term operation of MCFC has a serious problem which is the degradation of cathode material,the so-called Ni dissolution. In the present study, we have attempted to synthesize a new alternative cathode material as Co/Nb-coated NiO cathode. The results obtained in this study suggest that the Co/Nb-coated NiO cathode can be utilized as having lower dissolution and higher cell performance than those of the pure NiO cathode.
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