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Physical Parameters of Electrode Plates Measurement of B.E.T. surface area and pore-size distribution were made on selected specimens by Micromeritics, Inc., Norcross, Georgia, 30093. The measurements were made using their Model 2100 Orr Surface-Area Pore-Volume Analyzer. The specific surface area was determined by the standard multipoint B.E.T. technique using Krypton adsorption. Pore-sizedistributionsweremeasuredwithamercury-intrusionporosi- meter. EXPERIMENTAL RESULTS Electrode Performance as a Function of Electrochemical Processing Figure 34-7 shows the relationship between voltaic efficiency, charge and discharge voltages for selected current densities, plotted against milliampere-hours/cm2 of activation. Figure 34-8 shows the polarization curves of various selected elec trodes under standard conditions. As the chlorine electrode becomes electrochemically more active, the side nearest the zinc electrode appears to darken. This effect is maximized somewhere between 2 300 and 500mAh/cm . This is due, perhaps, to the electrode becoming less smooth and hence losing some of its reflective properties. This seems to correspond to the maximum voltaic efficiency attainable with this process. The performance of these electrolytically activated specimens can be compared to 2 those thermally processed in HNO^. After approximately 300mAh/cm , performance is equivalent to 21-day thermally-processed electrodes. Additionally, there is a corresponding similarity between the two types of electrodes in which the degree of activation is less than complete. 34-9PDF Image | Development of the Zinc-Chlorine Battery for Utility
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