Influence of surface phenomena on the impedance response of a rotating disk electrode

The objective of this work was to explore the role of surface blocking on t he impedance response associated with reduction of ferricyanide on a Pt rot ating disk electrode. The analysis took into account the possible role of n onuniform current distribution on the impedance response. The results sugge st that the time-dependent change to the Pt surface contributes to both a d ecrease of rate constant that hinders electrode kinetics and a blocking of the electrode surface that hinders mass transfer. (C) 1999 Elsevier Science Ltd. All rights reserved.