Abstract

Single-chamber solid oxide fuel cells (SC-SOFCs) consist of only one gas chamber, in which both the anode and the cathode are exposed to the same fuel-oxidant mixture. Thus, this configuration shows good thermal and mechanical resistance and allows rapid start-up and -down. In this study, the unit cell consisting of La_0.8Sr_0.2MnO₃ (cathode) / Zr_0.84Y_0.16O_2-x (electrolyte) / Ni-Zr_0.84Y _0.16O_2-x (anode) was fabricated and its electrochemical property was investigated as a function of temperature and the volume ratio of fuel and oxidant for SC-SOFCs. Impedance spectra were also investigated in order to figure out the electrical characteristics of the cell. As a result, the cell performance was governed by the polarization resistances of the electrodes. The cell exhibited an acceptable cell-performance of 86 mW/cm2 at 800℃ and stable performance for 3 hs under 0.7 V.

• Keywords: Single-chamber solid oxide fuel cell, Zirconia electrolyte, Electrochemical property, Polarization resistance