Compositional changes in unusually stabilized Prussian blue by CTAB surfactant: Application to electrocatalytic reduction of H2O2

We report here for the first time the ex situ Mossbauer and ESR identification of tetrahedrally coordinated high spin Fe3+ ions incorporated in the interstitial position of Prussian blue (PB) lattice of the PB–CTAB composite material prepared in pH = 1.7 (0.02 M HCl + 0.1 M KCl) solution in presence of CTAB surfactant during film preparation by electrochemical potential cycling method. The PB–CTAB composite film electrode, which possesses enhanced film growth, efficient and rapid charge transfer, and also extremely high stability, has been advantageously employed as an amperometric sensor for H2O2 estimation with extended linearity, and low detection limit, compared to an unmodified PB film electrode. The presently developed surfactant stabilized PB film electrode possesses the best sensitivity towards H2O2 ca. 9.79 A M−1cm−2, highest ever found for PB-based H2O2 probes, and also holds some of the better qualities than the well-known H2O2 sensors.