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용융탄산염형 연료전지에서 과전압에 미치는 전극두께의 영향
이충곤,이성윤,류보현,김도형,임희천,Lee, Choong-Gon,Lee, Sung-Yoon,Ryu, Bo-Hyun,Kim, Do-Hyung,Lim, Hee-Chun 한국전기화학회 2010 한국전기화학회지 Vol.13 No.1
This work investigated the effect of anode thickness on the anodic overpotential with $100\;cm^2$ class MCFC single cells. The hydrogen oxidation rate in the molten carbonate is sufficiently high, which may lead to weak relation of overpotential with anode geometrical area. The relation of anode surface area and overpotential was analysed in terms of anode thickness in this work. Steady state polarization, inert gas step addition (ISA), and reactant gas addition (RA) methods were employed to the two cells with 0.77 mm and 0.36 mm thickness of anode. The result represented that the anodic overpotential at the cells were identical. It implied that the anodic overpotential was independent on the electrode thickness within the tested range. 본 연구에서는 용융탄산염형 연료전지의 연료극 전극두께가 과전압에 미치는 영향을 $100\;cm^2$ 급 단위전지를 사용하여 검토하였다. 용융탄산염형 연료전지에서의 수소 산화속도는 충분히 빨라 전극면적이 성능에 크게 영향을 미치지 않을 수 있어, 본 연구에서는 전극의 기하학적 면적의 크기가 과 전압에 미치는 영향에 대해 연구하였다. 평가는 정상분극법과 비활성가스 계단형 첨가법 (ISA)와 반응물 첨가법 (RA)를 사용하여 연료극 두께 0.77 mm와 0.36 mm에 대해 수행하였다. 평가결과 두 전지에서 연료극 과전압이 거의 동일하게 관찰되어 연료극 두께에 의한 과전압의 차이는 발생하지 않았다.
고무용 카본블랙 촉매를 이용하는 메탄분해에 의한 수소 생산
윤기준(Yoon, Ki June),류보현(Ryu, Bo Hyun),이상엽(Lee, Sang Yup),한귀영(Han, Gui Yong) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
For CO₂-free hydrogen production and better utilization of the produced carbon, catalytic decomposition of methane over rubber-grade carbon blacks manufactured from coal tar was carried out. The catalytic activities of several domestic carbon blacks were compared. A pelletized carbon black exhibited considerably lower activity and activation energy than the fluffy( loose) carbon black of the same grade. This difference is considered due to the binder that was added during pelletization. For pelletized carbon blacks, a tendency was observed that the activity per unit mass of catalyst increased with the specific surface area of the carbon black. Another tendency was also observed that the activation energy increased with the primary particle size or decrease of the specific surface area.
용융탄산염에서 Co를 코팅한 NiO 공기극의 용해도에 대해 Cathode gas 분압이 미치는 영향
노길태,류보현,한종희,남석우,임태훈,홍성안,임종주 한국공업화학회 2004 응용화학 Vol.8 No.1
NiO cathode dissolution is considered as one of the serious problems determining the MCFC life time. In this work, 6wt% and 12 wt% Co-coated specimens were fabricated by electro plating method and NiO cathode as reference. The aim of this experiment is to investigate Co coating effect by determination solubility at the variable cathode gas partial pressure in Li/K and Li/Na electrolytes. To obtain the suppression factors of NiO dissolution, Atomic Adsorption Spectroscopy (AAS), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) were used.