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Figure 37-5 shows the discharge efficiencies as a function of the acid concentration. The data is more scattered and may indicate the discharge efficiency is lower than the charge efficiency. If this is true, then the electrode potential cannot be the controlling factor regarding hydrogen evolution. Conclusions based on this single series of experiments are still speculative. G=. 2.0M ZnCI2 o.l M ZnCl2 1 .OM ZnCI2 0.5M ZnCi2 0.3M ZnCI- DISCHARGE EFFICIENCY CONCENTRATION OF HCI — moles/liter Figure 37-5. Discharge coulombic efficiencies of ZnCl2 electrolytes plotted against acid concentra tion. Note inconsistency of data compared to charge data of Figure 37-3. HYDROGEN EVOLUTION Experimental Conditions for Metallic Impurity Evaluations The experimental conditions for evaluating hydrogen evolution due to metallic im purities were determined by correlating the behavior of nickel in a test battery to its behavior in a transfer plating cell. The use of nickel was not a random selection. Its behavior in zinc-chlorine batteries has been documented. Although the test results show considerable scatter, all the results demonstrate an exten sive loss in the coulombic efficiency which is attributed to the presence of nickel in the electrolyte. The losses in round-trip coulombic efficiencies were deter mined by the differences in coulombic efficiencies before and after nickel was add ed to the test cell. The average coulombic loss attributed to nickel was 14%. 37-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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