Introduction

Yttria-stabilized zirconia (YSZ) is a typical electrolyte material used in SOFC. To generate useful power from the cell, the electrolyte must exhibit a sufficiently high conductivity. To achieve such a condition, the YSZ-based cell typically has to be operated around 1000°C. Such a high operating temperature often causes degradation and compatibility problems among cell components, affecting SOFC's cell life and commercialization potential. There is a desire to reduce the operating temperature of SOFC to below 800°C (1) to simplify the SOFC design and improve the cell efficiency. To operate SOFC at intermediate temperatures, the choice of electrodes and interconnect would be most likely different from the high-temperature system. Oxide transfer kinetics at the electrode is often the rate limiting step at intermediate temperatures. Conventional electrode materials such as Pt or Sr-doped La manganites are not sufficiently effective in catalyzing transfer kinetics at these temperatures. New electrode materials therefore have to be sought.

Bismuth-strontium-calcium-copper oxide QfoSrcCaC^Os, BSCCO) has been studied recently as high Tc superconducting materials (2). Similar materials have been studied for SOFC applications (3) since they all exhibit mixed conductivities at intermediate temperatures. Their potential as an oxide conducting electrode material is therefore worth exploring. Here we report the preparation, microstructure, and electrochemical behavior of the BSCCO electrode on 10 mol% YSZ.

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