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Prussian Blue-Modified Titanate Nanotubes : A Novel Nanostructured Catalyst for Electrochemical Reduction of Hydrogen Peroxide

Prussian blue (PB) modified titanate nanotubes (PB-TiNT) have been synthesized by the reaction of Fe2+-modified TiNT with hexacyanoferrate(III) ions. The rate constant for heterogeneous catalytic reaction between PB-TiNT and H2O2 was found to be k=2×104 dm3 mol−1 s−1, which is an order of magnitude higher than the values of k reported for conventionally prepared, electrochemically deposited PB films. On the PB-TiNT modified electrode with subnanomolar surface concentration of PB (Γ(PB)=2.8×10−11 mol/cm2), a stable, reproducible and linear response towards H2O2 was obtained in the concentration range 0.02–4 mM, with the sensitivity of 0.10 AM−1 cm−2 at −150 mV.

Prussian blue ; titanate nanotubes ; hydrogen peroxide ; electrocatalysis

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