Electron transfer kinetics of the ferrous/ferric redox system on the platinum deposits on gold

•Pt deposits on Au represent a heterogeneous electrode with a rate constant k.•Rate constant k for Fe2 +/3 + decreases gradually as Pt deposition covers Au surface.•The reorganization energy of the Fe2 +/3 + system contributes mostly to kAu0/kPt0.

Electron transfer rate constant decreases gradually for a Fe2+/3+ redox system as platinum deposition covers a gold surface. This effect is assumed to be conditioned by reconstruction of double electric layer on a platinum deposit which increases reorganization energy and decreases the redox reaction rate constant.

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