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Enhanced stability of a Prussian blue/sol-gel composite for electrochemical determination of hydrogen peroxide |
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| Authors: | Florica Doroftei Tudor Pinteala Adina Arvinte |
| Institution: | 1. “Petru Poni” Institute of Macromolecular Chemistry, Centre of Advanced Research in Nanobioconjugates and Biopolymers, Grigore Ghica Voda Alley 41A, 700487, Iasi, Romania 2. Department of Bioengineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK |
| Abstract: | We have prepared a sol–gel that incorporates Prussian Blue (PB) as a redox mediator. It is shown that the PB in the pores of the sol–gel retains its electrochemical activity and is protected from degradation at acidic and neutral pH values. TEM and EDX studies revealed the PB nanoparticles to possess a cubic crystal structure and to be well entrapped and uniformly dispersed in the pores of the matrix. The electrocatalytic activity of the materials toward hydrogen peroxide (H2O2) was studied by cyclic voltammetry and amperometry. The modified electrode displays good sensitivity for the electrocatalytic reduction of H2O2 both in acidic (pH 1.4) and neutral media. The sensor has a dynamic range from 3 to 210 μM of H2O2, and the detection limit is 0.6 μM (at an SNR of 3). TEM micrograph of the Sol-gel–PB composite showing a large quantity of crystalline cubic nanoparticles uniformly distributed in the sol-gel matrix and electrocatalytic response of the Sol-gel–PB electrode for hydrogen peroxide. |
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