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EFFECT OF MASS TRANSPORT AT THE A1 ELECTRODE The Rotating Disk Arrangement An overall view of the rotating disk electrode setup is shown in Fig. 3. It consisted of a sturdy stand on which a /15-hp Bodine motor and a precision ball bear- ing for the 0.025-in. rotating shaft were mounted. The motor speed was controlled by a Minarik speed control ( SL-52). The coupling of the motor and the electrode shaft was accomplished by a non-slip belt. The rotation rate of the electrode was continuously monitored by frequency modulation resulting from magnetic coupling of an electromagnet with an iron gear mounted on the rotating shaft, This signal was amplified and displayed on a frequency counter (Hewlett Packard model no. 5221A). Electrical contact to the disk electrode was accomplished through a mercury pool in the top of the rotating shaft. The electrochemical cell was made of a 50-mm O-ring joint with a 30-mm- thick Teflon cover. The Teflon cover contained tapered holes to accommodate a liquid seal in the center with a 29/40 standard tapered joint surrounded by four 10/30 joints for gas inlet and outlet as well as the counter- and reference electrodes. A Teflon bell was fixed to the rotating shaft (Fig. 4) e Mercury and silicone oil with a very low vapor pressure were used as sealant liquids. The rotating electrode consisted of a cylindrical piece of pure A1 press-fitted into hot Teflon. Details of the electrode construction are shown in Fig. 4. A sheet ofpureA1ofapproximately15cm2wasusedasthecounterelectrode, andanA1wire served a s the reference electrode. The electrochemical cell was held at a constant temperature by a stirred silicone oil bath. Temperature was controlled to *0.2 "C by a Matheson Lab Stat proportional temperature control unit and a two-stage heating arrangement. As in all earlier measurements, the cell was assembled in the dry box. During the ex- periments, an Ar atmosphere at a slightly positive pressure was maintained above the melt. Results All results of our stationary polarization measurements at A1 electrodes in- dicate that the anodic limiting currents a r e a function of the mass transport in the melt. We therefore expected the anodic limiting currents to depend on the diffusionPDF Image | NASA ALUMINUM CHLORINE BATTERY
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