INFLUENCE OF THE SURFACE-STRUCTURE OF CADMIUM ELECTRODES ON THE ELECTRIC DOUBLE-LAYER PARAMETERS IN AQUEOUS SURFACE-INACTIVE ELECTROLYTE-SOLUTIONS

The electric double layer structure at the electrochemically polished Cd(0001), Cd(10 (1) over bar 0), Cd(11 (2) over bar 0), Cd(10 (1) over bar 1) and Cd(11 (2) over bar 1), and chemically treated Cd(0001), Cd (10 (1) over bar 0) and Cd(11 (2) over bar 0) electrodes in aqueous su rface-inactive electrolyte solutions was studied using cyclic voltamme try, impedance and chronocoulometry. The limits of ideal polarizabilit y, potentials of zero charge and capacity of the inner layer were esta blished. Like those for the respective single crystal planes of Zn, th e value of the zero charge potential decreases and the inner layer cap acity increases if the superficial density of atoms decreases. The cap acity of the metal phase was established using the various theoretical approximations. The effective thickness of the thin metal layer incre ases in the sequence of planes Cd(11 (2) over bar 0) < Cd(10 (1) over bar 0) < Cd(0001) as the surface density of atoms increases.