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The potential of the graphite disk electrode was controlled by a Wenking LT 73 potentiostat. A wave form generator (TWG 500) was used in conjunction with the potentiostat in order to sweep the potential of the disk electrode. The potential-current data were recorded on a Houston Instrument 2000 X-Y Recorder. The ZnCl^ solution was obtained from EDA, Inc. where it was prepared by direct recombination of Cl2 gas and pure Zn rods (99.999% New Jersey zinc). The ZnCl^ concentration was measured by hydrometer. C^2-N2 9as m;i-xtures were fed into the cell by a gas expenser, and the dissolved Cl^ concentration was main tained bymeasuring the Cl- and .flow.-jrates. .The dissolved Cl^ concentration was measured by standard titration using 1/100 normal Na^S^O^*5H20. Dissolved oxygen was removed by bubbling prior to the experiments, and the Cl^-N,^ gas mixture was bubbled throughout the experiments. The polarization measurements of the zinc metal in zinc chloride solution were performed on a rotating hemispherical zinc electrode [3]. In order to eliminate the concentration overpotential, the rotational speed of the electrode was u)=3,000 rpm, sufficiently high not to influence the concentration over potential. Hemisphericalelectrodewasusedbecauseitsprimarycurrentdistri bution is uniform. RESULTS AND DISCUSSION Single Cell The polarization of the zinc and the chlorine electrodes vs. the zinc reference electrode was measured during the charging and the discharging of the single cell. Typical polarization curves are shown in Figures 3 and 4 for the charging and charging-discharging cycles, respectively. The upper curves show the Cl^ - porous graphite electrode potential, and the lower curves represent the Zn electrode potential vs. the reference electrode. The overall cell potential is the difference between the two curves and is 2.30 V during the charging and 1.80 V during the discharging. The individual overvoltage can be read from the drop in the potential after the current is shut off. The main polarization appears to be on the Cl^ electrode. The overpotential on the A-6PDF Image | Development of the Zinc-Chlorine Battery for Utility
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