NASA-TM-82913
Chemical and Electrochemical Behavior of the Cr(lll)/Cr(ll) Half Cell in the NASA Redox Energy Storage System
active, Most Current
| Organization: | NASA |
| Publication Date: | 1 October 1982 |
| Status: | active |
| Page Count: | 19 |
scope:
ABSTRACT
The Cr(III) complexes in the NASA Redox Energy Storage System have been isolated and identified as Cr(H20)6+3 and Cr(H20)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 calculated using Beer's Law. During the charge mode Cr(H20)5CI+2 is reduced to Cr(H20)5CI+ and during the discharge mode Cr(H20)5C+ is oxidized back to Cr(H20)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(H20)6+3 and Cr(H20)5CI +2.
Document History
NASA-TM-82913
October 1, 1982
Chemical and Electrochemical Behavior of the Cr(lll)/Cr(ll) Half Cell in the NASA Redox Energy Storage System
ABSTRACT
The Cr(III) complexes in the NASA Redox Energy Storage System have been isolated and identified as Cr(H20)6+3 and Cr(H20)5Cl+2 by ion-exchange chromatography and visible spectrophotometry....