Fabrication of BaZr0.1Ce0.7Y0.2O3 – δ -Based Proton-Conducting Solid Oxide Fuel Cells Co-Fired at 1,150 °C

✍ Scribed by W. Sun; Z. Tao; Z. Shi; L. Yan; Z. Zhu; W. Liu

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 828 KB
• Volume: 10
• Category: Article
• ISSN: 1615-6846
• DOI: 10.1002/fuce.200900206

✦ Synopsis

Abstract

Dense proton‐conducting BaZr~0.1~Ce~0.7~Y~0.2~O~3 – δ~ (BZCY) electrolyte membranes were successfully fabricated on NiO–BZCY anode substrates at a low temperature of 1,150 °C via a combined co‐press and co‐firing process. To fabricate full cells, the LaSr~3~Co~1.5~Fe~1.5~O~10 – δ~–BZCY composite cathode layer was fixed to the electrolyte membrane by two means of one‐step co‐firing and two‐step co‐firing, respectively. The SEM results revealed that the cathode layer bonded more closely to the electrolyte membrane via the one‐step co‐firing process. Correspondingly, determined from the electrochemical impedance spectroscopy measured under open current conditions, the electrode polarisation and Ohmic resistances of the one‐step co‐fired cell were dramatically lower than the other one for its excellent interface adhesion. With humidified hydrogen (2% H~2~O) as the fuel and static air as the oxidant, the maximum power density of the one‐step co‐fired single cell achieved 328 mW cm^–2^ at 700 °C, showing a much better performance than that of the two‐step co‐fired single cell, which was 264 mW cm^–2^ at 700 °C.