Abstract
Adsorption of pyridine at an Au(210) single-crystal electrode has been investigated using chronocoulometry, cyclic voltammetry and phase-sensitive ac voltammetry. The adsorption parameters, such as the relative Gibbs surface excesses, the Gibbs energies of adsorption, the electrosorption valencies and the potential drop across the inner layer, have been calculated. These results suggest that pyridine molecules assume a vertical, N-bonded, orientation at the Au(210) surface. The full coverage Gibbs energy of adsorption at the potential of maximum adsorption is approximately equal to −63 kJ mol −1, which is a value typical of weak chemisorption. The adsorption of pyridine at the (210) surface was compared with adsorption at the (311), (110), (100) and (111) planes of gold.
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