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layer thickness and thus on the rotation rate of the rotatingAldisk electrode, The results of our experiments in AlCh-KCl-NaCl( 57.5-12.5-30.0 mol %) at 125"Care summarized in Fig. 5. This figure shows the variation of the anodic limiting current on the limiting plateau for different A1 samples and different poten- tials as a function of the square root of the angular velocity. The limiting current at a rotating disk electrode for a reaction controlled only by mass transfer is given by Levich ( Ref. I.) as: iL = (constant) nFD2I3 c31/ 2 where the value of the constant is approximately 0.620, D is the diffusion coefficient, Qcis the concentration gradient of the electroactive species, IJ is the viscosity, andc3=2n(rps),where rps =rotations per second. This equation implies a linear relationship between iL and c3" under diffusion controlled conditions. As Fig. 5shows, the experimental data can indeed be represented very well by a straight line. The slight deviations from linearity and some variation in the individual current densities were expected, One must keep in mind that here we are actually dealing with the dissolution of a passivating solid salt layer at the surface of the rotating electrode, which is in many respects quite different from the idealized conditions for which the above equation is strictly valid. Further, at the high current densities observed, changes in the electrode itself cannot be avoided. These results show clearly, however, the role of transport phenomena in removing reaction pro- ducts from the electrode surface. They show further that high current densities can be obtained atAlelectrodes at relatively low temperature if the transport limitations can be overcome. CPDF Image | NASA ALUMINUM CHLORINE BATTERY
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