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http://dx.doi.org/10.3795/KSME-B.2012.36.9.931

Study on Low-Temperature Solid Oxide Fuel Cells Using Y-Doped BaZrO3  

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.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.9, 2012 , pp. 931-935 More about this Journal
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.
Keywords
Y-doped Barium Zirconate; Proton Conductor; Solid Oxide Fuel Cell; Thin Film; Polarization Curve; Electrochemical Impedance Spectroscopy;
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