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  • 1
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    Performance of advanced chromium electrodes for the NASA Redox Energy Storage System (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Chromium electrodes were prepared for the NASA Redox Storage System with meet the performance requirements for solar-photovoltaic, wind-turbine and electric utility applications. Gold-lead catalyzed carbon felt electrodes up tp 930 sq cm were fabricated and tested in single cells and multicell stacks for hydrogen evolution, coulombic efficiency, catalyst stability and electrochemical activity. Factors which affect the overall performance of a particular electrode include the carbon felt lot, the cleaning treatment and the gold catalyzation method. Effects of the chromium solution chemistry and impurities on charge/discharge performance are also presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82724 , E-1025 , DOE/NASA/12726-15
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Nickel-hydrogen component development (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Light weight energy storage systems for future space missions are investigated. One of the systems being studied is the nickel hydrogen battery. This battery is designed to achieve longer life, improve performance, and higher energy densities for space applications. The nickel hydrogen component development is discussed. Test data from polarization measurements of the hydrogen electrode component is presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-83487 , E-1811 , NAS 1.15:83487 , Natl. Tech. Assoc. Conv.; Jul 25, 1983 - Jul 30, 1983; Kissimee, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Advances in membrane technology for the NASA redox energy storage system (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Anion exchange membranes used in the system serve as a charge transferring medium as well as a reactant separator and are the key enabling component in this storage technology. Each membrane formulation undergoes a series of screening tests for area-resistivity, static (non-flow) diffusion rate determination, and performance in Redox systems. The CDIL series of membranes has, by virtue of its chemical stability and high ion exchange capacity, demonstrated superior properties in the redox environment. Additional resistivity results at several acid and iron solution concentrations, iron diffusion rates, and time dependent iron fouling of the various membrane formulations are presented in comparison to past standard formulations.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82701 , DOE/NASA/12726-12 , E-738 , Electrochem. Soc. Meeting; Sep 05, 1980 - Sep 10, 1980; Hollywood, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Preparation and characterization of electrodes for the NASA Redox storage system (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Electrodes for the Redox energy storage system based on iron and chromium chloride reactants is discussed. The physical properties of several lots of felt were determined. Procedures were developed for evaluating electrode performance in lab scale cells. Experimental procedures for evaluating electrodes by cyclic voltammetry are described which minimize the IR losses due to the high internal resistance in the felt (distributed resistance). Methods to prepare electrodes which reduced the coevolution of hydrogen at the chromium electrode and eleminate the drop in voltage on discharge occasionally seen with previous electrodes were discussed. Single cells of 0.3329 ft area with improved membranes and electrodes are operating at over 80% voltage efficiency and coulombic efficiencies of over 98% at current densities of 16 to 20 amp % ft.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82702 , DOE/NASA/12726-13 , E-739 , Electrochem. Soc. Meeting; Sep 05, 1980 - Sep 10, 1980; Hollywood, FL; United States
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    NASA TECHNICAL REPORTS
  • 5
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    Assessment of commercially available and experimental hydrogen electrodes (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Lewis Research Center is currently involved in advanced cell component development for nickel-hydrogen cells and batteries. Long life, high energy density, improved performance and reliability are required for energy storage systems in future space missions. Commercially available as well as experimental hydrogen electrodes were assessed and copared to the state-of-the-art hydrogen electrode that is currently being used in nickel-hydrogen batteries. These electrodes were evaluated by scanning electron microscopy and standard electrochemical polarization measurements. Production variables such as Teflon content and platinum catalyst loading were considered in order to assess various hydrogen electrods with regard to the different electrode manufacturing processes.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-87264 , E-2958 , NAS 1.15:87264 , International Power Sources Symposium; Jun 09, 1986 - Jun 12, 1986; Cherry Hill, NJ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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