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ProJect element • 4.0 - Support1ng Technology Contractor Spr1ng Arbor College Spr1ng Arbor, Mich. 49283 T1tle ••••••••••••••• Chem1cal and Electrochem1cal Aspects of Chrom1c/Chromous Electrode React10n 1n NASA Redox Energy Storage System Principal investigator Contract number • • • Period of performance • Work 1ocation • • • Contracting off1ce Cumulat1ve funding (through fiscal year 1980; re1mbursable only) Dav1d A. Johnson NAG3-148 • 1/81 to 12/81 Spr1ng Arbor, M1Ch. NASA Lew1s Research Center • • • • ~12 000 Background: ObJectives: Approach: Output: There have been no deta1led analyses at NASA Lewis of the complex ion chem1stry of the chrom1um solut1on, Wh1Ch 1S one of the fully soluble Redox couples (Cr+2/Cr+3) currently 1S use. In-house stud1es have shown several hysteresis effects (lower open-c1rcu1t voltage on discharge than charge and different color changes on charge and d1scharge) in the Redox flow cell system. The effects are bel1eved to be due to a slow establishment of equ1l1br1um between several complex Cr+3 species. To more clearly identify the chromium speC1es in the chrom1um solution of the NASA Redox energy storage system as well as to determ1ne the mechanism of the reduction and oxidat1on at the catalyzed carbon felt electrode. Prepare and study spectroscopically a ser1es of pure isomers with varying concentrations to f1nd a good catalyst to promote rapid equ1l1bration of these species. Follow the electrochemical react10n at the chrom1um electrode of a Redox flow cell and study 1t in terms of complex ion equ1libria. Final report by January 1982. These stud1es should lead to improved charge rates and energy effic1enc1es for the 1ron-chromium Redox system. 36PDF Image | NASA Redox Storage System Development Project 1980
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