A novel metalloporphyrin intercalated layered niobate as an electrode modified material for detection of hydrogen peroxide

Cationic iron (III) tetrakis-5, 10, 15, 20-(N-methyl-4-pyridyl)porphyrin (FeIIITMPyP) was intercalated into layered semiconductor KNb3O8 for the first time by ion-exchange method. FeIIITMPyP forms an inclined monolayer between Nb3O8− nanosheets and endues the nanocomposite with a pair of characteristic redox peaks of FeIIITMPyP. The FeIIITMPyP–Nb3O8− nanocomposite modified glass carbon electrode shows high electrochemical catalysis toward reduction of hydrogen peroxide with a linear range at low concentration and a detection limit of 1.75 μM, the promising utilization of the nanocomposite as a material for biosensor was proposed.

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► Iron porphyrin intercalated niobate FeIIITMPyP–Nb3O8 was synthesized by an ion-exchange method.
► FeIIITMPyP froms a inclined monolayer in the layer spaces of the host niobate.
► The nanocomposite shows excellent electrochemical catalytic reduction on H2O2.