Abstract

The differential capacitance of high purity zone-refined iron was measured using a single pulse technique. Capacitance behaviour in dilute solutions of sodium perchlorate showed that an unambiguous assignment of a value to the pzc is not possible from the capacitance minima. Measurements in sodium halides showed a different behaviour with I − than with F −, Cl − and Br −. Electrode capacitance in an aqueous solution of furoic-acid-sodium-furoate buffer was determined over 300 mV on either side of the open-circuit potential. The effect of specifically adsorbed furoate ions on the morphology of the capacitance curves is very striking.

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