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Figure 1

Electrochemical performance of SOFC-anodes and cathodes manufactured by WPS

Figure 2 Microstructure of a double- Fi8ure 3 Electrochemical activity of 10 cathodes layered SOFC-cathode (dark pores, distributed in the 240x240 mm" coating area dark gray LSM, light gray 8YSZ)

STATUS OF SOFCo SOFC TECHNOLOGY DEVELOPMENT

R. Privette, M.A. Pema, K. Kneidel J. Hartvigsen, S. Elangovan, A. Khandkar

SOFCo, a Babcock & Wilcox/Ceramatec Co. SOFCo, 2425 South 900 We 1562 Beeson St, Alliance, Ohio 44601 Salt Lake City, Utah 84119

SOFCo, a Babcock & Wilcox / Ceramatec Research & Development Limited Partnership, is a collaborative research and development venture (formed in 1994) to develop technologies related to planar, solid-oxide fuel cells (SOFCs). SOFCo has successfully demonstrated a kW-class, solid-oxide fuel cell module operating on pipeline natural gas. The SOFC system design integrates the air preheater and the fuel processor with the fuel cell stacks into a compact test unit; this is the platform for multi-kW modules. The cells, made of tape-cast zirconia electrolyte and conventional electrode materials, exhibit excellent stability in single-cell tests approaching 40,000 hours of operation (see Figure 1). Stack tests using 10-cm and 15-cm cells with ceramic interconnects also show good performance and stability in tests for many thousands of hours.

Included in these efforts has been a program aimed at lowering operating temperatures of SOFCs. This has several advantages related to long-term stability and lower balance-of-plant costs. Under a program sponsored by the Electric Power Research Institute, SOFCo is evaluating ceria-based SOFCs operating in the temperature range of 650° - 800°C. Optimized cells that maximize ionic conductivity and stability in fuel conditions have led to stable operation for extended durations (see Figure 2). Also, stacks with zirconia electrolyte show stable performance (see Figure 3).

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