Investigation of H 2 O 2 Electrochemical Behavior on Ferricyanide-Confined Electrode Based on Ionic Liquid-Functionalized Silica-Mesostructured Cellular Foam.

In this work, ionic liquid (IL) of 1-propyl-3-methyl imidazolium chloride-functionalized silica-mesostructured cellular foam (MCF) was prepared. The obtained MCF-IL was used to construct the Fe(CN) 6 3- -confined electrode (MCF-IL-Fe(CN) 6 3- /PVA) and H 2 O 2 electrochemical behavior on the electrode was investigated. It was found that H 2 O 2 was oxidized on the freshly prepared electrode while catalytically electro-reduced on the acid pretreated one. Cyclic voltametric results revealed that the real catalyst for catalytic reduction of H 2 O 2 was Prussian blue (PB) rather than Fe(CN) 6 3- . The electrocatalytic ability of the acid-pretreated MCF-IL-Fe(CN) 6 3- /PVA electrode offered a wide linear range for H 2 O 2 detection. The present study on H 2 O 2 electrochemical behavior on an MCF-IL-Fe(CN) 6 3- /PVA electrode might provide useful information for further developing integrated Fe(CN) 6 3- -mediated biosensors as H 2 O 2 is extensively involved in the classic reaction containing oxidase enzymes.