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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.
장익황(Chang, Ik-Whang),차석원(Ha, Seung-Bum),하승범(Cha, Suk-Won),이윤호(Lee, Yoon-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
This paper investigated environmental effects for passive, air-breathing, and vapor-feeding direct methanol fuel cells. In these experiments, experimental parameters are temperature(30?C, 40?C and relative humidity(25%, 50%, 75%). From these experimental results, the water contents play a key role in terms of optimal ionic conductivity at the cathode catalyst layer. In case of pure methanol feeding, the performance is inversely proportional to the relative humidity. The water generation resulting from methanol crossover maintains ionic conductivity at the cathode. On the contrary, diluted methanol solution (50wt.%) lowers methanol crossover to the cathode. In order to increase ionic conductivity, the relatively high humidity is required to the cathode catalyst layer for the water generation. The relative humidity scales with the performance.
수동급기 직접 메탄올 연료전지의 유로에 따른 성능 평가
장익황(Chang, Ikw-Hang),하승범(Ha, Seung-Bum),차석원(Cha, Suk-Won) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
This paper presents a passive air-breathing direct methanol fuel cell (DMFC) which has been designed and tested. The single cell is fuelled by methanol vapor that is supplied through flow channel from a methanol reservoir at the anode, and the oxygen is supplied via natural air-breathing at the cathode. The methods for supplying the methanol vapor to the single cell were parallel channel and chamber. This research investigates various methods to identify the effects of using flow channels for providing the methanol vapor at the anode, and the opening ratio between the inlet and outlet ports for the methanol flow at the anode. The best flow channel condition for passive DMFC was a chamber, and the opening ratio was 0.8. Under these conditions, the peak power was 10.2mW/cm² at room temperature and ambient pressure. The key issues for the Passive DMFCs for using methanol vapor are that sufficient methanol needs to be supplied using a large as possible opening ratio. However, it is shown that the performance of the passive DMFC, which has a channel at the anode,is low due to the low differential pressure and insufficient methanol supply rate.