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The curves of both Figs. 4and 5 were obtained on Pt electrodes starting at-a potential of 1, 1 V versus Al. From this srarting point, the potential was linearly decreased to zero, then increased linearly to 2 V, and then decreased again without a waiting time to 1. 1 V. The qualitative shape of the curve is the same in both cases. The following characteristics were noted: 1 A more or less pronouncedcathodiccurrent peak was observed at about 1 V , probably due to-reduction of Fe3+ incorporated in Some layer close to the electrode. (This layer can be an adsorptio11 layer or a still undeveloped diffusion layer. ) 2. Cathodic limiting current at- more negative potentials appears to correspond to the steady state reductionof Fe3+ to Fe2' 3. A cathodic peak at about 200 mV seems to-c~orrespond to the reduction of Fe3' (and Fe2+) to Fe. 4. An anodic peak at about 500 mV apparently corresponds to oxidation of Fe to Fez+ The current drop after thcpeak can be attributed to depletion of Fe or, more probably, to some passivation 5. After this passivation,arelativecathodiccurrent is observed that can be.attributed to reduction of-Fe 3+ 6. Finally,theanodic peak at 1. 1 V can be interpreted as being due to oxidation of the passive film (Fe2' - salt?) formed at 3+ 500 mV and of the underlying Fe. Any dissolved Fe2+ is oxidized to Fe at potentials higher than 1. 2 V. From the comparison of Figs. 4and 5 it seems reasonable to identify the major impurity present in A1C13 as Fe. The change of coloration may be due to several factors, e. g. , (1) the formation of colloidal hydroxides of heavy metals as the melt adsorbs water, (2) a higher degree of oxidation of these impurities, or (3) decomposition of organic material. Thus? in order to obtain satisfactorily clean eutectics, we have studied first the behavior of a large number of electrolytes prepared 14 YPDF Image | ALUMINUM CHLORINE BATTERY
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