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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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    Single cell performance studies on the Fe/Cr Redox Energy Storage System using mixed reactant solutions at elevated temperature (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    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 evaluted by measuring watt-hour and coulombic efficiencies, voltage-current relationships, hydrogen evolution and membrane resistivity. Watt-hour efficiencies ranged from 86% at 43 ma/sq cm to 75% at 129 ma/sq cm with corresponding coulombic efficiencies of 92% and 97%, respectively. Hydrogen evolution was less than 1% of the charge coulombic capacity during charge-discharge cycling. Bismuth and 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.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-83385 , DOE/NASA/12726-21 , E-1662 , NAS 1.15:83385 , Intersoc. Energy Conversion Engr. Conf.; Aug 21, 1983 - Aug 26, 1983; Orlando, FL; United States
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    NASA TECHNICAL REPORTS
  • 3
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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
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    NASA TECHNICAL REPORTS
  • 4
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    Scanning-electron-microscopy observations and mechanical characteristics of ion-beam-sputtered surgical implant alloys (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An electron bombardment ion thruster was used as an ion source to sputter the surfaces of orthopedic prosthetic metals. Scanning electron microscopy photomicrographs were made of each ion beam textured surface. The effect of ion texturing an implant surface on its bond to bone cement was investigated. A Co-Cr-W alloy and surgical stainless steel were used as representative hard tissue implant materials to determine effects of ion texturing on bulk mechanical properties. Work was done to determine the effect of substrate temperature on the development of an ion textured surface microstructure. Results indicate that the ultimate strength of the bulk materials is unchanged by ion texturing and that the microstructure will develop more rapidly if the substrate is heated prior to ion texturing.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-3553 , E-9056
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    NASA TECHNICAL REPORTS
  • 5
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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
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    NASA TECHNICAL REPORTS
  • 6
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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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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