Monolithic solid oxide fuel cell technology advancement for coal-based power generation. Final report, September 1989--March 1994

Technical Report · Sun May 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10177949· OSTI ID:10177949

This project has successfully advanced the technology for MSOFCs for coal-based power generation. Major advances include: tape-calendering processing technology, leading to 3X improved performance at 1000 C; stack materials formulations and designs with sufficiently close thermal expansion match for no stack damage after repeated thermal cycling in air; electrically conducting bonding with excellent structural robustness; and sealants that form good mechanical seals for forming manifold structures. A stack testing facility was built for high-spower MSOFC stacks. Comprehensive models were developed for fuel cell performance and for analyzing structural stresses in multicell stacks and electrical resistance of various stack configurations. Mechanical and chemical compatibility properties of fuel cell components were measured; they show that the baseline Ca-, Co-doped interconnect expands and weakens in hydrogen fuel. This and the failure to develop adequate sealants were the reason for performance shortfalls in large stacks. Small (1-in. footprint) two-cell stacks were fabricated which achieved good performance (average area-specific-resistance 1.0 ohm-cm{sup 2} per cell); however, larger stacks had stress-induced structural defects causing poor performance.

• Research Organization: Allied-Signal Aerospace Co., Torrance, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-89MC26006
• OSTI ID: 10177949
• Report Number(s): DOE/MC/26006--3824; ON: DE94012258; BR: AA1505000/AA1510050
• Country of Publication: United States
• Language: English

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