Development of solid oxide fuel cell stack using lanthanum gallate-based oxide as an electrolyte

T. Yamada, N. Chitose, H. Etou, M. Yamada, K. Hosoi, N. Komada, T. Inagaki, F. Nishiwaki, K. Hashino, H. Yoshida, M. Kawano, S. Yamasaki, Tatsumi Ishihara

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    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).

    Original languageEnglish
    Title of host publicationAdvances in Solid Oxide Fuel Cells II - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
    Pages17-25
    Number of pages9
    Volume27
    Edition4
    Publication statusPublished - 2006
    EventAdvances in Solid Oxide Fuel Cells II - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
    Duration: Jan 22 2006Jan 27 2006

    Other

    OtherAdvances in Solid Oxide Fuel Cells II - 30th International Conference on Advanced Ceramics and Composites
    CountryUnited States
    CityCocoa Beach, FL
    Period1/22/061/27/06

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites

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