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Cyclic scans at-a Pt wire microelectrode were run in order to observe the background curren-tand obtain an indication of the nature of the impurities. The cyclic scans were recorded in the usual manner. A triangular waveform from a function generator (Exact Electronics, Inc. type 255) was fed into the-input of a Wenking potentio- stat (type61RS). The poteytiostatic current-voltage curves were recordedon an X-Y recorder (Houston Omnigraphic model HR-98T). Galvanostatic polarization curves were obtained by supplying a constant current from a power supply and recording the overpotential on either an oscilloscope or on the X-Y recorder. It has been established (Refs. 22 and 23) that an A1 electrode is a stable reference in this ternary eutectic, and all potentials are referred to this electrode. T h e actual reference electrode consisted of a coil of pure A1 wire contained in a fritted compartment ro prevent-concentration changes from taking place in the vicinity of the electrode. A similar coil of A1 wire served as counter electrode. The Pt needle electrode was made in the usual way by sealing Pt into glass. A typical current-voltage scanis shown in-Fig. 3. The anodic decom- position limit was approximately-Vl-2versus Aland correspondtosC12evolution. Thereductionwaveat4-1VversusA1was suspectedPObeduetothe reduction of-ferric ions. The addition of A1 powder resulted in a marked ~~ reduction of the background current, probably by the reaction A1fFeN 4 Ee+AI3+ For subsequent measurements, AlC13 was obtained from Fluka Chemicals (Switzerland). It was stated to beanhydrousandiron-free. A ternary mixture made up with this material melts readily on a hot plate and forms a clear melt except for a darkish yellow coloration. A cyclic scan obtained in this melt is shownin Fig. 4. It appears that FeC13 is still present as an impurity. The deliberate addition of a small amount of FeC13 resulted in the current-voltage curve shown in Fig. 5. 10PDF Image | ALUMINUM CHLORINE BATTERY
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