Abstract
Layered CoTMPyP/SrTa2O7 nanocomposite was fabricated by the ion-exchange method of inserting 5, 10, 15, 20-tetrakis (N-methylpyridinium-4-yl) porphyrinato cobalt (III) (CoTMPyP) into the interlayer of Bi2SrTa2O9. CoTMPyP cation forms a monolayer inclined to the [SrTa2O7]2− nanosheets at an angle of about 70°. The electrochemical qualities of the CoTMPyP/SrTa2O7 nanocomposite were studied by cyclic voltammetry and differential pulse voltammetry. The results showed that the nanocomposite modified electrode exhibited great electrocatalytic activity toward oxidation of nitrite in the neutral solution and the oxidation process on the surface of modified electrode was controlled by diffusion. Furthermore, a detection limit for nitrite was calculated as 1.40 × 10−5 M with a linear concentration detection range from 0.29 to 3.31 mM.
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