Performance of a Porous Electrolyte in Single-Chamber SOFCs

A cell which consists of a porous 18 μm thick Y-doped (YSZ) electrolyte vol % open porosity) on a NiO-YSZ anode substrate and a cathode using has been investigated in the single-chamber configuration. The cell performance and catalytic activity of the anode was measured in a flowing air-methane gas mixture with various flow rates. The results showed that the open-circuit voltage and the power density increased as the gas flow rate increased. The cell generated an open-circuit voltage of about 0.78 V, which was only about 0.1 V lower than that observed with dense electrolyte specimens. A maximum power density of 660 mW cm −2 (0.44 V) was obtained at set (cell in the flow rate of 900 cm 3 min −1 , where the current efficiency was about 5% determined from fuel consumption. © 2005 The Electrochemical Society. All rights reserved.