Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on Low-Temperature Solid Oxide Fuel Cells Using Y-Doped BaZrO3

Y-doped BaZrO3을 이용한 저온형 박막 연료전지 연구

  • Chang, Ik-Whang (Dept. of Intelligent Convergence Systems, Seoul Nat'l Univ.) ;
  • Ji, Sang-Hoon (Dept. of Intelligent Convergence Systems, Seoul Nat'l Univ.) ;
  • Paek, Jun-Yeol (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Lee, Yoon-Ho (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Park, Tae-Hyun (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Cha, Suk-Won (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.)
  • 장익황 (서울대학교 지능형융합시스템학과) ;
  • 지상훈 (서울대학교 지능형융합시스템학과) ;
  • 백준열 (서울대학교 기계항공공학부) ;
  • 이윤호 (서울대학교 기계항공공학부) ;
  • 박태현 (서울대학교 기계항공공학부) ;
  • 차석원 (서울대학교 기계항공공학부)
  • Received : 2012.03.13
  • Accepted : 2012.07.02
  • Published : 2012.09.01
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Abstract

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-${\mu}m$-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/$cm^2$ at $350^{\circ}C$. Even though a fully dense electrolyte is deposited via PLD, a cross-sectional transmission electron microscopy (TEM) image reveals many voids and defects.

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 지르코네이트(BYZ) 전해질과 백금 수소극/공기극으로 이루어져 있으며, 성능은 $350^{\circ}C$에서 측정하였다. 350nm의 두께를 가지는 백금 수소극은 다공성 기판 위에 스퍼터링 기법을 이용하여 증착하였다. BYZ전해질은 펄스레이저 기법을 이용하여 $1{\mu}m$ 증착하였고, 상부에 스퍼터링 기법을 이용하여 200nm의 두께를 가지는 백금 공기극을 증착하였다. 개회로 전압은 약 0.81V이었고, 최대 출력 성능은 11.9mW/$cm^2$이었다.

Keywords

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