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ProJect element Contractor•••• Title •. Princ1pal Contract number • • • • Per10d of performance • Work 10cat1on .•• Contracting office •••• 4.0 - Supporting Technology NASA Lewis Research Center Redox Project Office 21000 Brookpark Rd. Cleveland, Ohio 44135 In-House Electrode Uevelopment and Evaluat10n • • Randall F. Gahn • • DE-AI04-80AL12726 • Calendar year 1978 to present Cleveland, Oh10 NASA Lewis Research Center ~281 600 Stable, reversible electrodes are requ1red for the Redox energy storage system. Antic1pated system llfet1mes of 20 years would requ1re electrodes to undergo more than 7000 cycles operat1ng on a one-cycle-per day bas1s. Slngle-cell systems have exceeded 20 000 cycles w1thout slgnif1cant performance changes. Uncatalyzed carbon felt 1S used for the iron electrode, and gold-lead catalyzed carbon felt for the chrom1um electrode. Considerable variat10ns 1n performance of the chromium electrode are caused by var1at1on in the carbon felt. To cons1stently prepare chrom1um electrodes w1th acceptable electrochem1cal performance, to evaluate contractor-prepared electrodes, and to beg1n work on planar, catalyzed electrodes. Evaluate electrodes in cell hardware and by CyCl1C voltammetry. Measure performance as a funct10n of carbon felt lot, clean1ng treatment, and catalys1s procedure. Use speciflc tests for hydrogen evolutlon, coulombic eff1ciency, catalyst stabll1ty, and electrochemlcal activity. A "standard" method for fabr1cating, cleaning, and catalyzing carbon felt for use as chrom1um electrodes. A report cover1ng chrom1um electrode testing wlll be published 1n m1d-1981. Routine experimental technlques for evaluating electrodes. 1nvestigator Cumulat1ve funding (through fiscal year 1980; re1mbursable only) Background: ObJectives: Approach: Output: 34PDF Image | NASA Redox Storage System Development Project 1980
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