A novel hydrogen peroxide sensor based on the redox of ferrocene on room temperature ionic liquid film

Abstract

A novel sensor was constructed based on the catalytic activity of ferrocene (Fc) that was immobilized on a room temperature ionic liquids (RTILs), 1-ethyl-3-methyl imidazolium tetrafluoroborate ([EMIM][BF 4]), film. Electrochemical behavior of ferrocene was investigated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). A pair of stable, well-defined and quasi-reversible redox peak of ferrocene could be obtained at pH 7.0 phosphate buffer. Further investigations reveal that both anodic and cathodic peak currents of ferrocene vary linearly with the concentration of hydrogen peroxide (H 2O 2). Based on this, a new sensor for the measurement of H 2O 2 can be fabricated facilely. This sensor allowed us to measure H 2O 2 by polarizing the electrode under ether anodic or cathodic potential with an excellent stability and anti-interfering ability.