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Besides providing needed direction for further study, it has made possible valuable insight into possible limitations of chlorine electrode life. The experimentation detailed in this section was performed exclusively with Union Carbide Porous Graphite Grade 60. The performance and characteristics of other graphites tested during Phase X are discussed in Section 35. EXPERIMENTAL PROCEDURES Test specifics are basically identical to those detailed in the 1976 EPRI report (34-2). They are therefore covered only in sufficient detail as to reflect newer technology or fundamental changes. Chemicals employed throughout are of ACS Reagent Grade or, as in the case of ZnCl^, are produced at EDA. As voltaic studies do not require the extreme cleanli ness required in coulombic evaluations, the methodology of cell cleanup is not detailed other than to note that rinsing on a deionized water line was employed. Test Cells and Systems Employed The small cell ('vSOWh) employed during the initial process development stage shown in Figure 34-1 is the same cell employed in 1976. For details about its construction refer to the EPRI report (34-2). The majority of testing reported on was performed with this cell. During this study the use of a new chlorine-electrode test cell was introduced. This cell, a true "single-cell", is shown in Figure 34-2. Separate voltage measure ment and current-carrying leads are naturally employed. Although the primary reason for the construction of the cell was to provide ease of cell assembly, and hence to expedite test turnaround, other features of significance to electrode testing were incorporated. With this cell, gas blockage of the chlorine test plate is avoided by the use of the standpipes indicated. By doing this a flowing vent is avoided, thereby allowing direct and precise measurement of actual electrode flow. Additionally, more uniform current-density distribution is realized by contacting the test electrode along its entire periphery. In these respects the effects of cell design on electrode performance are thereby obviated to some extent. 34-3PDF Image | Development of the Zinc-Chlorine Battery for Utility
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