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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CURRENT DENSITY — mA/cm2 Figure 34-11. Back-side performance of a fully activated (electrolytically) chlorine electrode. The chlorine-electrode test cell shown in Figure 34-2 was employed. The PG-60 plate was electrolytically activated, and its voltaic performance determined. The plate was then flipped over and re-tested. Performance again drops, but less than for the above case. At 40/45 the penalty was 2.5% (91.9 vs. 89.4%). For this experiment, the chlorine-electrode evaluation cell shown in Figure 34-2 was employed. This cell, which has become the cell of choice for reasons of simplicity and flexibility, has improved current-density distribution due to the method of contact employed in contrast to that of the single-edge buses design. The Nature of the Active Chlorine Electrode In searching for the cause of the enhanced voltaic performance realized with porous- graphite chlorine electrodes as a result of these processing techniques, B.E.T. surface area and pore size distribution (by mercury intrusion) measurements were made on selected electrode specimens. The degree to which electrode plates are wetted by the electrolyte was analyzed because it also is considered most significant. These electrode parameters are now discussed in more detail. 34-14

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