Chapter 2. Development of Solid Oxide Fuel Cell Stack Using Lanthanum Gallate-Based Oxide as an Electrolyte
- Narottam P. Bansal,
- Andrew Wereszczak and
- Edgar Lara-Curzio
Published Online: 26 MAR 2008
Copyright © 2007 The American Ceramics Society
Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4
How to Cite
Yamada, T., Chitose, N., Etou, H., Yamada, M., Hosoi, K., Komada, N., Inagaki, T., Nishiwaki, F., Hashino, K., Yoshida, H., Kawano, M., Yamasaki, S. and Ishihara, T. (2006) Development of Solid Oxide Fuel Cell Stack Using Lanthanum Gallate-Based Oxide as an Electrolyte, in Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4 (eds N. P. Bansal, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291337.ch2
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2006
Print ISBN: 9780470080542
Online ISBN: 9780470291337
One of the important trends in recent years is to reduce the operating temperature of solid oxide fuel cell (SOFC). Since FY2001, Mitsubishi Materials Corporation (MMC) and The Kansai Electric Power Co., Inc. (KEPCO) have been collaborating to develop intermediate temperature SOFC modules, which use lanthanum gallate based electrolyte, for stationary power generation.
Our recent study has been focused on the durability of the stack repeat unit which is composed of a disk-type electrolyte-supported cell, an anode-side current collector, a cathode-side current collector and two interconnects, and on the improvement of the output power density of the cell. A long-term test of a stack repeat unit has been performed at 750°C under constant current density of 0.3 A/cm2 with hydrogen flow rate of 3 ml/min/cm2 and air flow rate of 15 ml/min/cm2 for over 10,000 hrs. The decrease in terminal voltage was not observed the initial 2,000 hrs, but was 1∼2 %/1,000 hrs after then. The maximum electrical efficiency attained was 54 %(LHV) at 750 °C and 0.292W/cm2 with 90% hydrogen utilization.
The third-generation 1-kW class module was operated as CHP demonstration system for 2,000 hrs without significant degradation.
The fourth-generation 1-kW class module successfully provided the output power of 1 kW with thermally self-sustained operation below 800 °C. The average electrical efficiency calculated from the experimental data for 21 hrs stable operation was 60%(LHV).