A New Hydrogen Peroxide Sensor Based on Prussian Blue Modified n-n+-Si Photo-Electrode

Abstract

A prussian blue (PB) film has been deposited on the surface of platinum (Pt) coated n-type epitaxial silicon (Pt/n-n+-Si) wafer. The electro-deposition of PB was achieved by a cyclic scan in a potential range of −0.2 to +0.60V (vs SCE) at 50 mV/s for 5 cycles in a solution containing 2.5 mM FeCl3, 2.5 mM K3Fe(CN)6, 0.1 M KCl and 0.1 M HCl with an illumination from 50 W bromine-tungsten lamp. The emphasis is laid on that this modified silicon electrode can be used as a sensor for the photocurrent determination of hydrogen peroxide at a zero bias by a two-electrode system without reference electrode. The use of the PB modified Pt/n-n+-Si electrode as a hydrogen peroxide sensor was demonstrated with good stability and selectivity. The PB film was characterized by cyclic voltammetry measurements and scanning electronic microscopy (SEM). A new photo-electrochemical sensor based on two-electrode system has been developed for determination of hydrogen peroxide.