Abstract
The multilayer films containing tris(1,10-phenanthroline) ruthenium(II) Ru(phen)3Cl2 (abbr. Ru(phen)3, phen = 1,10-phenanthroline) and polyoxometalate [P2W18O62]6− (abbr. P2W18) through a layer-by-layer (LBL) process were fabricated. UV–vis absorption spectra showed that the subsequent growth of the multilayer film was regular and highly reproducible from layer to layer. X-ray photoelectron spectra (XPS) confirmed the incorporation of Ru(phen)3 and P2W18 into the film. The result of atomic force microscopy (AFM) revealed a relatively uniform surface morphology of the multilayer film. The multilayer film exhibited remarkable electrocatalytic activities toward the reduction of $$ {\text{IO}}_{3}^{ - } $$ and the oxidation to l-cysteine. The value of I pc was as a function with the concentration of iodate and l-cysteine, which indicated that the film can be a candidate for bifunctional electrocatalyst and electrochemical sensor.
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