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  • 1
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    Single cell performance studies on the FE/CR Redox Energy Storage System using mixed reactant solutions at elevated temperature (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Experimental studies in a 14.5 sq cm single cell system using mixed reactant solutions at 65 C are described. Systems were tested under isothermal conditions, i.e., reactants and the cell were at the same temperature. Charging and discharging performance were evaluated by measuring watt-hour and coulombic efficiencies, voltage-current relationships, hydrogen evolution and membrane resistivity. Watt-hour efficiencies ranged from 86 percent at 43 ma/sq cm to 75 percent at 129 ma/sq cm with corresponding coulombic efficiencies of 92 percent and 97 percent, respectively. Hydrogen evolution was less than 1 percent of the charge coulumbic capacity during charge-discharge cycling. Bismuth amd bismuth-lead catalyzed chromium electrodes maintained reversible performance and low hydrogen evolution under normal and adverse cycling conditions. Reblending of the anode and cathode solutions was successfully demonstrated to compensate for osmotic volume changes. Improved performance was obtained with mixed reactant systems in comparison to the unmixed reactant systems. Previously announced in STAR as N83-25042
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 2
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    NASA Lewis Evaluation of Regenerative Fuel Cell (RFC) Systems (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Evaluation of two regenerative fuel cell (RFC) systems was begun in-house, and under contracts and grants. The passive hydrogen-oxygen RFC offers the possibility of a high-energy density, long-life storage system for geosynchronous Earth orbit missions. The hydrogen-bromine RFC offers the combination of high efficiency and moderate energy density that could ideally suit low Earth orbit missions if successfully developed. Either or both of these systems would be attractive additions to the storage options available to designers of future missions.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Goddard Space Flight Center The 1985 Goddard Space Flight Center Battery Workshop (date); p 13-18
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    NASA TECHNICAL REPORTS
  • 3
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    Cycling performance of the iron-chromium redox energy storage system (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Extended charge-discharge cycling of this electrochemical storage system at 65 C was performed on 14.5 sq cm single cells and a four cell, 867 sq cm bipolar stack. Both the anolyte and catholyte reactant fluids contained 1 molar concentrations of iron and chromium chlorides in hydrochloric acid and were separated by a low-selectivity, cation-exchange membrane. The effect of cycling on the chromium electrode and the cation-exchange membrane was determined. Bismuth and bismuth-lead catalyzed chromium electrodes and a radiation-grafted polyethylene membrane were evaluated by cycling between 5 and 85 percent state-of-charge at 80 mA/sq cm and by periodic charge-discharge polarization measurements to 140 mA/sq cm. Gradual performance losses were observed during cycling but were recoverable by completely discharging the system. Good scale-up to the 867 sq cm stack was achieved. The only difference appeared to be an unexplained resistive-type loss which resulted in a 75 percent W-hr efficiency (at 80 mA/sq cm versus 81 percent for the 14.5 sq cm cell). A new rebalance cell was developed to maintain reactant ionic balance. The cell successfully reduced ferric ions in the iron reactant stream to ferrous ions while chloride ions were oxidized to chlorine gas.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 4
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    Negative electrode catalyst for the iron chromium redox energy storage system (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A redox cell which operates at elevated temperatures and which utilizes the same two metal couples in each of the two reactant fluids is disclosed. Each fluid includes a bismuth salt and may also include a lead salt. A low cost, cation permselective membrane separates the reactant fluids.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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  • 5
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    Modification of a fuel-cell engine for control by a digital computer (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A manually operated fuel-cell system was modified to be monitored and controlled by a digital computer. The purpose was to have a test item with which to study possible system-computer interface problems. The modification consisted of installing solenoid valves, circuitry, transducers, and limit switches on the system. These modifications permit computer control of load current, reactant purge, water removal, and electrolyte concentration and computer initiation of system shutdown.
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TM-X-2575 , E-6866
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    NASA TECHNICAL REPORTS
  • 6
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    Transport dynamics of a high-power-density matrix-type hydrogen-oxygen fuel cell (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Experimental transport dynamics tests were made on a space power fuel cell of current design. Various operating transients were introduced and transport-related response data were recorded with fluidic humidity sensing instruments. Also, sampled data techniques were developed for measuring the cathode-side electrolyte concentration during transient operation.
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TN-D-7757 , E-7876
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    NASA TECHNICAL REPORTS
  • 7
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    Simulated hydrogen cross-leakage in a low-temperature, contained-electrolyte hydrogen-oxygen fuel cell (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Simulated hydrogen leakage in electrolytic hydrogen-oxygen fuel cells
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TM-X-52542
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    NASA TECHNICAL REPORTS
  • 8
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    Investigation of the dynamics of water rejection from a hydrogen-oxygen fuel cell to a hydrogen stream (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Dynamics of water rejection from hydrogen-oxygen fuel cell to hydrogen stream
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TN-D-4201
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Design flexibility of redox flow systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: (Previously announced in STAR as N82-31459)
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IECEC ''82; Seventeenth Intersociety Energy Conversion Engineering Conference; Aug 08, 1982 - Aug 12, 1982; Los Angeles, CA
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    NASA TECHNICAL REPORTS
  • 10
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    Redox storage systems for solar applications (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is noted that the worldwide development of solar photovoltaic and wind turbine systems to meet a range of terrestrial electrical energy requirements has underscored the need for inexpensive and reliable electrical energy storage. The NASA Redox Energy Storage System, based on soluble aqueous iron and chromium chloride redox couples, has exhibited many system-related features which for the most part are unique to this storage system. The technology advances required in the two elements (electrodes and membranes), which are the key to its technological feasibility, have been attained and system development has begun. The design, construction, and testing of a 1-kW system integrated with a solar photovoltaic array is underway to provide early demonstration of the attractive system-related features of the NASA Redox Storage System. Also demonstrated will be its versatility and compatibility with a terrestrial solar photovoltaic electric power system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: In: Power sources 8: Research and development in non-mechanical electrical power sources; Sep 01, 1980; Brighton
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