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Development of Advanced Fuel Cell System (Phase 4)A multiple-task research and development program was performed to improve the weight, life, and performance characteristics of hydrogen-oxygen alkaline fuel cells for advanced power systems. During Phase 4, the lowest stabilized degradation rate observed in all the testing completed during four phases of the program, 1 microvolt/hour, was demonstrated. This test continues after 5,000 hours of operation. The cell incorporates a PPf anode, a 90Au/10Pt cathode, a hybrid frame, and a Fybex matrix. These elements were developed under this program to extend cell life. The result demonstrated that the 80Au/20Pt cathode is as stable as a 90Au/10Pt cathode of twice the precious metal loading, was confirmed in full-scale cells. A hybrid frame two-cell plaque with dedicated flow fields and manifolds for all fluids was demonstrated to prevent the cell-to cell electrolyte transfer that limited the endurance of multicell plaques. At the conclusion of Phase 4, more than 90,900 hours of testing had been completed and twelve different cell designs had been evaluated. A technology base has been established which is ready for evaluation at the powerplant level.
Document ID
19760016598
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Meyer, A. P. (United Technologies Corp. South Windsor, CT, United States)
Bell, W. F. (United Technologies Corp. South Windsor, CT, United States)
Date Acquired
September 3, 2013
Publication Date
January 31, 1976
Subject Category
Energy Production And Conversion
Report/Patent Number
FCR-0165
NASA-CR-135030
Accession Number
76N23686
Funding Number(s)
CONTRACT_GRANT: NAS3-15339
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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