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백준열,차석원,장익황,이민환,지상훈 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.5
This paper investigates the optimum deposition condition of yttrium-doped barium zirconate (BZY) through a change in the targetsubstrate distance (TSD), one of the most important parameters in pulsed laser deposition, by conducting an analysis of the crystal structural and morphological properties of BZY thin films. As the TSD increases, the grain size of the BZY particle increases and the surfaces of BZY thin films show a tendency to be porous. The deposition rate also decreases. As TSD decreases, on the other hand,the crystal structure of BZY thin films becomes more crystalline and the deposition rate gradually increases, and the deposition rate decreases instead in case TSD is shorter than the length of the plume.
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.
Graphite Foil Based Assembled Bipolar Plates for Polymer Electrolyte Fuel Cells
지상훈,차석원,황용신,박태현,이윤호,백준열,장익황,이민환 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.12
Graphite foil has been considered as a promising bipolar plate material in polymer electrolyte fuel cells due to its high electrical conductance and high corrosion resistance as well as low manufacturing costs. However, the highly flexible character of graphite foil led to physical deformation under external mechanical and thermal stimuli during fuel cell operations. In this study, we show a modified bipolar plate to overcome the weakness by combining with a mechanically sturdy component – polycarbonate plate. A unit cell with the assembled bipolar plates showed stable powering behaviors under thermal cycling. There was no significant difference in ohmic resistance between a unit cell with the assembled bipolar plates and a unit cell with graphite plates.