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홍성안,남석우 ( Seong Ahn Hong,Suk Woo Nam ) 한국공업화학회 1992 공업화학 Vol.3 No.4
The molten carbonate fuel cell(MCFC) has been under intensive development for the last decade as a second generation fuel cell. The advantages of the MCFC over the phophoric acid fuel cell are higher efficiency, its ability to accept CO and H₂ as a fuel, lower material costs, and high operating temperature making internal reforming possible. These features, along with low atmospheric emissions, will open up a significant market as an attractive means of developing highly efficient power plant. This article reviews a status of the MCFC research and development, a principle of the MCFC, and cell and stack technology including the status of electrodes, matrices and electrolytes. Several technical difficulties which must be resolved to be commercialized are mainly focused.
박막을 형성한 원통형 덩어리 모델의 다공성 기체확산 전극 유효성인자
노제승,홍성안,서성섭 ( Je Seung Roh,Seong Ahn Hong,Sung Sup Suh ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
The porous gas diffusion electrode was described by cylindrical agglomerate model with electrolyte thin film to investigate the effectiveness factor. System variables such as reaction rate constant, diffusion coefficients, conductivity, agglomerate size, electrode thickness and temperature were combined into four dimensionless parameters. The effectiveness factor was slightly larger than that for slab agglomerate model. However, the effects of the system variables on the effectiveness factor were similar. The effect of electrolyte thin film was very small where the ratio of the thin film thickness to the agglomerate size was less than 0.01. The electrode thickness for the optimum electrode performance was independent of the agglomerate shape.
용융탄산염 연료전지의 Anode가스 분위기에서 AISI-type 316L stainless steel의 전기화학적 부식 특성
이갑수,임태훈,홍성안,김화용,Lee, Kab-Soo,Lim, Tae-Hoon,Hong, Seong-Ahn,Kim, Hwa-Yong 한국전기화학회 2002 한국전기화학회지 Vol.5 No.2
The corrosion of the metallic cell components is blown to be one of the major reason f3r the performance degradation and subsequently the life-time limitation of the MCFC. To elucidate the corrosion phenomena, a corrosion study with the AISI-type 316L stainless steel, the most widely used separator material, in 621Li/38K carbonate eutectic melt was carried out. Corrosion phenomena in an MCFC were observed to differ from one location to another due to different environmental condition. The stability of passive film was found to be responsible fur the variations in corrosion phenomena. According to the potentiodynamic analysis, the passive film formed in anode-gas environment was less stable than in cathode-gas environment. The potentiostatic method combined with XRD analysis in addition to the cyclicvoltammetry was conducted to get an insight on variety corrosion reaction of AISI-type 316L stainless steel in a carbonate melt. 용융탄산염 연료전지의 성능 저하와 수명 감소의 원인이 되는 부식 현상을 규명하고자 분리판 재료로 가장 널리 사용되고 있는 AISI-type 316L stainless steel을 대상으로 62Li/38K계 용융탄산염 내에서의 부식 실험을 수행하였다. 부식의 형태 및 속도는 환경에 의하여 다양하게 변화하게 되며, 용융탄산염 내에서 AISI-type 316L stainless steel의 부식 속도는 부식 반응에 의하여 형성되는 부동태 산화막의 안정성에 의하여 크게 영향을 받는다. 전기화학적 분극 거동을 분석한 결과 용융탄산염 연료전지의 anode가슨 분위기에서는 안정한 부동태 산화막이 형성되지 않았다. 순환 전압전류법과 정전위법을 이용한 부식 생성물의 X-ray분석을 통하여 특정한 전기화학적 전위 영역에서 반응기구와의 인과관계를 규명하고 다양한 형태의 부식 반응들을 분리해 내었다.