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  • 1
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    Chemical and electrochemical behavior of the Cr(3)/Cr(2) half cell in the NASA Redox Energy Storage System (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Cr(III) complexes in the NASA Redox Energy Storage System were isolated and identified as Cr(H2O)6(+3) and Cr(H2O)5Cl(+2) by ion exchange chromatography and visible spectrophotometry. The cell reactions during charge-discharge cycles were followed by means of visible spectrophotometry. The spectral bands were resolved into component peaks and concentrations calculated using Beer's Law. During the charge mode Cr(H2O)5Cl(+2) is reduced to Cr(H2O)5Cl(+) and during the discharge mode Cr(H2O)5Cl(+) is oxidized back to Cr(H2O)5Cl(+2). Both electrode reactions occur via a chloride-bridge inner-sphere reaction pathway. Hysteresis effects can be explained by the slow attainment of equilibrium between Cr(H2O)6(+3) and Cr(H2O)5Cl(+2).
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TM-82913 , E-1318 , DOE/NASA/12726-17 , NAS 1.15:82913
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Chemical and electrochemical behavior of the Cr(III)/Cr(II) half-cell in the iron-chromium redox energy storage system (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Cr(III) complexes present in the acidified chromium solutions used in the iron-chromium redox energy storage system have been isolated and identified as Cr(H2O)6(3+) and Cr(H2O)5Cl(2+) by ion-exchange chromatography and visible spectrophotometry. The cell reactions during charge-discharge cycles have been followed by means of visible spectrophotometry. The spectral bands were resolved into component peaks and concentrations of the Cr(III) species calculated using Beer's law. During the charge mode, Cr(H2O)5Cl(2+) is reduced to Cr(H2O)5Cl(+), and during the discharge mode Cr(H2O)5Cl(+) is oxidized back to Cr(H2O)5Cl(2+). Electrode potential measurements also support this interpretation. Hysteresis effects in the charge-discharge curves can be explained by the slow attainment of equilibrium between Cr(H2O)6(3+) and Cr(H2O)5Cl(2+).
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Electrochemical Society, Journal (ISSN 0013-4651); 132; 1058-106
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An improved method for analysis of hydroxide and carbonate in alkaline electrolytes containing zinc (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A simplified method for titration of carbonate and hydroxide in alkaline battery electrolyte is presented involving a saturated KSCN solution as a complexing agent for zinc. Both hydroxide and carbonate can be determined in one titration, and the complexing reagent is readily prepared. Since the pH at the end point is shifted from 8.3 to 7.9-8.0, m-cresol purple or phenol red are used as indicators rather than phenolphthalein. Bromcresol green is recommended for determination of the second end point of a pH of 4.3 to 4.4.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Electrochemical Society, Meeting; Oct 15, 1978 - Oct 20, 1978; Pittsburgh, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Improvement and scale-up of the NASA Redox storage system (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A preprototype 1.0 kW redox system (2 kW peak) with 11 kWh storage capacity was built and integrated with the NASA/DOE photovoltaic test facility at NASA Lewis. This full function redox system includes four substacks of 39 cells each (1/3 cu ft active area) which are connected hydraulically in parallel and electrically in series. An open circuit voltage cell and a set of rebalance cells are used to continuously monitor the system state of charge and automatically maintain the anode and cathode reactants electrochemically in balance. Recent membrane and electrode advances are summarized and the results of multicell stack tests of 1 cu ft are described.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TM-81632 , DOE/NASA/12726-6 , E-644 , Intersoc. Energy Conversion Engineering Conf.; Aug 18, 1980 - Aug 21, 1980; Seattle, WA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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