Electrophoretic Deposition of Gadolinium-Doped Ceria As a Barrier Layer on Yttrium-Stabilized Zirconia Electrolyte for Solid Oxide Fuel Cells

Wednesday, 31 May 2017: 15:20
Marlborough A (Hilton New Orleans Riverside)
X. Liu (West Virginia University), S. Hu (west virginia university), and W. Li (West Virginia University)
Screen-printing or spin-coating are most common methods for deposition of the doped ceria barrier layer between cathodes (LSCF or LSM) and YSZ electrolyte in solid oxide fuel cells. However, it is difficult to achieve fully-dense barrier layer below the reaction temperature, e.g. 1400oC. In this study, a gadolinium-doped ceria (GDC) barrier layer was deposited on the YSZ electrolyte by an economically-efficient, scalable electrophoretic deposition method (EPD). Polypyrrole (PPy) was coated on YSZ surface as the conductive agent. Highly compact GDC green layer was obtained by the EPD process in an ethanol-based suspension. GDC thin layers in a thickness range of 8-10 µm were successfully densified at as low as 1250 oC. The performance of these EPD-deposited cells was evaluated using symmetrical cell configuration through the electrochemical impedance spectroscopy (EIS). In comparison, the ohmic resistance of the GDC barrier layer made by the conventional spin-coating method is reduced through the present EPD method. This result suggests that EPD is a desirable method for efficiently manufacturing electrode barrier layer with improved performance.