Thin Film Solid Oxide Fuel Cell (SOFC) for Intermediate Temperature Operation (700℃)

摘要

Yttria stabilised Zirconia (YSZ) 4 μm thick films have been deposited by closed loop unbalanced reactive magnetron sputtering from a ZrY-alloy target in O2-Ar plasmas onto microporous NiO/YSZ substrates. At 700℃ an open circuit voltage of 0.97 Volts was obtained for air/humidified H2. Cells with 4.2 cm2 active area using stainless steel current collectors showed maximum power densities of 1.0 W/cm2 at 725℃ but considerable degradation within 500 hours operation. The degradation was reduced by the addition of a 1 μm thick CeO2 10 mol % Y2O3 solid solution (CYO) layer on top of the YSZ thin film electrolyte. Cells with the bilayer electrolyte were operated for over 1800 h with tolerable degradation. The YSZ-CYO bilayer electrolyte cells survived thermal cycling without electrochemical performance degradation or structural ageing.