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efficiencies were determined by charging the rotating electrode with a measured quantity of amp-minutes, and then measuring the amp-minutes required to fully discharge the electrode. The round trip efficiency is then the amp-minutes of discharge divided by the amp-minutes of charge. During the six-month interval in which the impurities were evaluated, a control test was run 13 times as a check on the technique. The electrolyte for all the tests consisted of 0.5-molar zinc chloride and potassium chloride at a pH of 0.3 +_ 0.1. The tests were conducted at room temperature, 23 +_ 3°C, at an applied 2 current density estimated to be +_ 5 mA/cm . The charge time was nominally three hours. Thecontroltestresultsandthedateofevaluation.aregiveninTable37-5. The table shows the efficiency and reproducibility of the control are similar to other results using this technique. The procedural change instituted on 1-3-78 was made because it was found that when its oxide film is reduced, titanium cata lyzes hydrogen evolution at the zinc potential. In most of the previous tests. Date 8/15/77 8/18/77 8/19/77 8/24/77 8/26/77 8/29/77 9/1/77 10/12/77 10/25/77 11/1/77 1/3/78 1/16/78 1/25/78 Initial PH 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.31 0.31 0.30 0.30 0.30 0.30 AVERAGE: STANDARD DEVIATION: Coulomb!c Efficiency (%) 96.1 96.9 94.1 96.1 96.2 96.2 96.2 93.8 96.4 93.9 99.1* 98.8* 97.9* 96.3 1.7 Table 37-5 CONTROL RESULTS FOR IMPURITY TESTING USING ROTATING ZINC ELECTRODE *Procedural changes made using thicker graphite coating. 37-10PDF Image | Development of the Zinc-Chlorine Battery for Utility
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