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장익황(Ikwhang Chang),이대흥(Daeheung Lee),차석원(Suk Won Cha) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
At present, our society is investigating various next generation vehicles, including hybrid vehicles (HVs), electric vehicles (EVs), and fuel cell vehicles (FCVs). However, those type cars are absolutely different in terms of driving distance based on power sources. We compared fuel economy of FCVs, assuming a basic vehicle model. FCVs have a strong advantage for long driving distance (>400km) and a better fuel economy in same range. As a result, the market targets of fuel cell vehicle types and the cost per driving distance were identified differently by driving distance.
Y-doped BaZrO₃ 을 이용한 저온형 박막 연료전지 연구
장익황(Ikwhang Chang),지상훈(Sanghoon Ji),백준열(Jun Yeol Paek),이윤호(Yoon Ho Lee),박태현(Taehyun Park),차석원(Suk Won Cha) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.9
본 연구에서는 저온형 연료전지와 고온형 연료전지의 작동 및 구성 요소 측면 단점들을 보완하기 위해 중온 영역에서 작동하는 박막 연료전지를 제작하였다. 박막 연료전지는 이트륨이 도핑된 바륨 지 르코네이트(BYZ) 전해질과 백금 수소극/공기극으로 이루어져 있으며, 성능은 350℃에서 측정하였다. 350nm 의 두께를 가지는 백금 수소극은 다공성 기판 위에 스퍼터링 기법을 이용하여 증착하였다. BYZ 전해질은 펄스레이저 기법을 이용하여 1μm 증착하였고, 상부에 스퍼터링 기법을 이용하여 200nm 의 두께를 가지는 백금 공기극을 증착하였다. 개회로 전압은 약 0.81V 이었고, 최대 출력 성능은 11.9mW/cm² 이었다. In this study, we fabricate and investigate low-temperature solid oxide fuel cells with a ceramic substrate/porous metal/ceramic/ porous metal structure. To realize low-temperature operation in solid oxide fuel cells, the membrane should be fabricated to have a thickness of the order of a few hundreds nanometers to minimize IR loss. Yttrium-doped barium zirconate (BYZ), a proton conductor, was used as the electrolyte. We deposited a 350-nm-thick Pt (anode) layer on a porous substrate by sputter deposition. We also deposited a 1-μm-thick BYZ layer on the Pt anode using pulsed laser deposition (PLD). Finally, we deposited a 200-nm-thick Pt (cathode) layer on the BYZ electrolyte by sputter deposition. The open circuit voltage (OCV) is 0.806 V, and the maximum power density is 11.9 mW/cm² at 350 ℃. Even though a fully dense electrolyte is deposited via PLD, a cross-sectional transmission electron microscopy(TEM) image reveals many voids and defects.
전류차단법을 이용한 고분자전해질 연료전지의 오믹 저항 연구
지상훈(Sanghoon Ji),황용신(Yong-Sheen Hwang),이윤호(Yoon Ho Lee),박태현(Taehyun Park),백준열(Jun Yeol Paek),장익황(Ikwhang Chang),차석원(Suk Won Cha) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.4
전류차단법은 연료전지의 저항을 측정하기 위한 효율적인 방법으로 고려된다. 본 연구에서는 서로 다른 종류의 분리판을 가지는 고분자전해질 연료지의 오믹 저항을 전류차단법을 통해 평가하였다. 그라파이트 판을 분리판으로 가지는 연료전지와 그라파이트 포일 기반의 조립형 분리판을 가지는 연료전지는 모두 전류밀도가 증가함에 따라 오믹 면적비저항이 감소하였다. 반면, 그라파이트 판을 분리판으로 가지는 연료전지의 오믹 면적비저항은 셀 온도가 증가함에 따라 멤브레인을 통한 수소 이온전달 저항이 낮아져 감소하는 경향을 보였고, 그라파이트 포일 기반의 조립형 분리판을 가지는 연료전지의 오믹 면적 비저항은 분리판 요소들의 열팽창 차이로 인해 증가하는 경향을 보여주었다. The current interruption method is considered to be an efficient way of measuring the resistance of a fuel cell. In this study, the ohmic area specific resistances (ASRs) of polymer electrolyte fuel cells with different types of bipolar plates were evaluated using the current interruption method. The ohmic ASRs of both a fuel cell with graphite bipolar plates and a fuel cell with graphite foil-based assembled bipolar plates decreased as the current density increased. On the other hand, with increasing cell temperature, the ohmic ASRs of a fuel cell with graphite bipolar plates were decreased by a reduction in the proton transport resistance through the membrane, and the ohmic ASRs of a fuel cell with graphite foil-based assembled bipolar plates were increased by the differences in thermal expansion between different components of the bipolar plates.
Operating Conditions of Proton Exchange Membrane Fuel Cell Using Grafoil^{TM} as Bipolar Plates
박태현(Park, Taehyun),장익황(Chang, Ikwhang),이윤호(Lee, Yoon Ho),이주형(Lee, Juhyung),차석원(Cha, Suk-Won) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
In this study, Grafoil^{TM} which has comparable electric resistance and chemical stability but is flexible, fragile, and cheap material was adopted as bipolar plates for proton exchange membrane fuel cell(PEMFC) having only one straight line flow channel. Because of its flexibility, pressurizations of cell with various pressures showed different operating characteristics compared to ordinary graphite-used PEMFC. While performances of both cells decreased as these were pressurized, investigation of ohmic and faradaic resistance by electrochemical impedance measurement indicated different tendency of change. Ohmic resistance of graphite-used cell increased with increasing pressure, which is reversed in Grafoil^{TM}-used cell. It is speculated that effective chemical reaction area is decreased with increasing pressure in case of graphite-used one, but because of flexible property of Grafoil^{TM}, gas diffusion layer in Grafoil^{TM}-used cell was well-activated. Different rate of change of faradaic resistances in both cells support this supposition. However, although optimum point of pressurization is found, it is required to investigate other operating conditions because of low performance compared to graphite-used cell.