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Chemical and electrochemical behavior of the Cr(3)/Cr(2) half cell in the NASA Redox Energy Storage SystemThe 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).
Document ID
19820025587
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Johnson, D. A. (Spring Arbor Coll. Cleveland, OH, United States)
Reid, M. A. (NASA Lewis Research Center)
Date Acquired
September 4, 2013
Publication Date
January 1, 1982
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
E-1318
NAS 1.15:82913
DOE/NASA/12726-17
NASA-TM-82913
Accession Number
82N33463
Funding Number(s)
CONTRACT_GRANT: DE-AI04-80AL-12726
PROJECT: RTOP 776-72-41
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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