ADSORPTION OF ACETONITRILE ON POLYCRYSTALLINE AG ELECTRODES - COMPARISON WITH HG ELECTRODES

The adsorption of acetonitrile (ACN) from aqueous solution was investi gated with a polycrystalline Ag electrode using 0,05 mol dm-3 KClO4 as a supporting electrolyte. Charge-potential data were obtained both by integration of double-layer capacitance curves recorded by means of a lock-in amplifier, and by direct determination of the charge with pot ential steps. ACN was found to adsorb on Ag with qualitatively the sam e orientation as on Hg, but the adsorption Gibbs energy is lower, as e xpected from correlations involving other interfacial parameters.