Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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Set Test 83771 1 2 3 pH 0.3 0.3 0.3 Coulombic Efficiency (%) 100.5 100.7 100.5 99.2 99.2 99.0 98.9 99.2 99.5 100.1 100.4 99.8 97.2 98.3 96.6 99.5 99.2 99.0 Average Standard Efficiency Deviation 100.6 0.1 99.1 0.1 99.2 0.3 100.1 0.3 97.4 0.9 99.2 0.2 84771 1 84772 85771 85772* 88771 Table 37-2 COULOMBIC EFFICIENCY OF ZINC TRANSFER PLATING CELL 0.1 2 0.1 3 0.1 1 0.7 2 0.7 3 0.7 1 1.0 2 0.5 3 0.05 1 C0.5M HC1) 2 (0.5M HC1) 3 (0.5M HC1) 1 (0.5M HC1) 2 (0.5M HC1) 3 (0.5M HC1) *Set 85772 rejected from test data by use of 2.5d rule and Q test. sion of simultaneous testing is much better than day-to-day (sets) reproducibility. Set 85772 is considered an outlying result and is accordingly rejected from the set analysis. The average of the five sets of results is 99.6% efficiency with a stan­ dard deviation of 0.7. It is apparent, that to obtain high precision, simultaneous testing is preferred. Coulombic Efficiencies of Zn Deposition and Zn Dissolution in Zinc Chloride Hydro- chloric Acid Solutions In the preceding section it was concluded that the deposition of zinc from a 2-molar zinc chloride solution was nearly quantitative. Just as important, however, was 37-5

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