Ananthi, A. and Nareshkumar, T. and Mathiyarasu, J. and Joseph, J. and Phani, K.L.N. and Yegnaraman, V. (2011) A novel potentiometric hydrogen peroxide sensor based on pKa changes of vinylphenylboronic acid membranes. Materials Letters, 065 (23-24). pp. 3563-3565. ISSN 0167-577X

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A potentiometric hydrogen peroxide (H2O2) sensing scheme was developed using arylboronic acid as the electrode modifier. It is well-known that both aliphatic and aryl boronic acid undergo electrophilic displacement reaction with H2O2. This reaction involves replacement of boronic acid by the hydroxyl group of peroxide resulting in a change in pKa value that can be exploited for sensing of H2O2. Vinylphenylboronic acid (VPBA) ink was prepared using Nafion as the binder and it was drop cast on an electrode surface. Morphology of the modified electrode was analysed using scanning electron microscopy (SEM). The present modifier exhibited a linear relationship between the difference in electrode potential (ΔEp) vs. [H2O2] with a Nernstian slope of 26±2 mV in the concentration range of 10−1–10−5 M. Application of the VPBA modified electrode for hydrogen peroxide sensing was studied in an industrial dye-bleach effluent

Item Type: Article
Uncontrolled Keywords: Boronic acid; Potentiometry; Hydrogen peroxide; pKa; Modified electrode
Subjects: Electrodics and Electrocatalysis
Depositing User: ttbdu cecri
Date Deposited: 19 Nov 2012 08:39
Last Modified: 19 Nov 2012 08:39

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