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that the fifteen test results establish the precision of simultaneous testing and the day-to-day reproducibility of the technique under controlled experimental conditions. In this section, the coulombic effects of varying the zinc chloride concentration and the hydrochloric acid concentration are evaluated from a statistically designed experiment. The rotational speed of the electrode was 15-30 2 rpm and applied current density was 25-30 mA/cm . The experimental results are shown in Figures 37-3 and 37-4. The coulombic effi ciencies for charge are shown as a function of the acid concentration. The data suggests a family of straight lines having the formula y = a + bx where y = effi ciency, a = intercept and :x = hydrochloric acid concentration.An analysis'of variance for the charge coulombic efficiency indicates that the hydrochloric acid concentration is a significant parameter and that the zinc chloride concentration is statistically significant at the F = 0.01 level. 0 1.0 2.0 CONCENTRATION OF HCI—moles/liter CHARGE EFFICIENCY Figure 37-3. Charge coulombic efficiencies of ZnCl^ elec trolytes plotted against acid concentration. Table 37-3 illustrates curve fits for the data shown in Figure 37-3. The average value of "a" for the interval 0.3- to 2.0-molar zinc chloride is 98.9 ± 1.0 and the intercept is considered to be constant within this interval. As the zinc chloride 37-6 2.0M ZnCI2 1.0M ZnCl2 0.5M ZnCI2 0.3M ZnCI2PDF Image | Development of the Zinc-Chlorine Battery for Utility
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