By D Pletcher, R Greff, R Peat, L.M. Peter, D. Pletcher
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1. 9: hence in experiments with a rotating disc electrode, concentration changes will arise due to both diffusion and convec;tion. Electrical contact Sheath Active metal (a)1t Fig. 1. 9 - Convective flow resulting from the rotation of a disc electrode. Stream lines: (a) side view (b) from below the disc. 41) diffusion convection where Vx is the velocity of solution movement perpendicular to the disc. A solution of this problem depends on knowing the relationship between Vx and x and other parameters, particularly the rotation rate of the disc, w.
E. the formation of a double layer. If the electrode is positively charged it will promote adsorption of anions, while a negatively charged surface will enhance cation adsorption. In addition, the charge on the electrode can interact with dipoles in solution leading to their adsorption and orientation at the surface. Neutral molecule adsorption occurs most strongly where competition from charged species is at a minimum, and this is when the electrode is uncharged. The electrode is uncharged at the potential of zero charge.
74 (1970) 551. Relevant reading (1) W. J. Albery, Electrode processes, Clarendon Press, 1975. (2) J. O'M Bockris & A. K. N. Reddy, Modern electrochemistry - Volume 2, Plenum Press, 1970. (3) A. J. Bard & L. R. Faulkner, Electrochemical methods, John Wiley and Sons, 1980. 2 Steady state and potential step techniques As will now be clear from the first Chapter, electrochemical processes can be rather complex. In addition to the electron transfer step, coupled homogeneous chemical reactions are frequently involved and surface processes such as adsorption must often be considered.
Instrumental Methods in Electrochemistry by D Pletcher, R Greff, R Peat, L.M. Peter, D. Pletcher