Properties and Performance of Anode-Supported Proton-Conducting BaCe[sub 0.48]Zr[sub 0.4]Yb[sub 0.1]Co[sub 0.02]O[sub 3-δ] Solid Oxide Fuel Cells

Abstract

The anode-supported (BCZYC2)-based proton-conducting solid oxide fuel cells were fabricated using dual layer tape casting technique. BCZYC2 is a phase pure cubic perovskite and is stable in both humidified and at 973 K. The total dc conductivity of BCZYC2 measured in humidified was at 873 K. The cell performance was measured with humidified fuel and methanol/water fuel [with varying molar steam:carbon (S:C) ratios] at 873 K. The maximum open-circuit potential (OCP) of 1.04 V was achieved at 873 K in 3% humidified fuel with an accompanying peak power density of . The total cell polarization resistance was . Impedance measurements showed decreasing polarization and ohmic resistance with increasing current density. The cell operation via internal steam reforming of methanol was demonstrated using a methanol/water feed with 3:1 and 2:1 S:C ratios; however, the OCP was reduced to 0.97 and 0.95 V and the peak power density decreased to 65 and , respectively. This was primarily attributed to a lower concentration in the feed stream.