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

• Published in: Molecules (Basel, Switzerland) Switzerland), 2022-12, Vol.27 (24)
• Main Authors: Zhang, Ling, Ma, Zhenkuan, Fan, Yun, Jiao, Songlin, Yu, Zhan, Chen, Xuwei
• Format: Article
• Language: English
• Subjects: Electrochemical reactions; Enzymes; Silica
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules27249028

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)[sub.6] [sup.3−]-confined electrode (MCF-IL-Fe(CN)[sub.6] [sup.3−]/PVA) and H[sub.2]O[sub.2] electrochemical behavior on the electrode was investigated. It was found that H[sub.2]O[sub.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[sub.2]O[sub.2] was Prussian blue (PB) rather than Fe(CN)[sub.6] [sup.3−]. The electrocatalytic ability of the acid-pretreated MCF-IL-Fe(CN)[sub.6] [sup.3−]/PVA electrode offered a wide linear range for H[sub.2]O[sub.2] detection. The present study on H[sub.2]O[sub.2] electrochemical behavior on an MCF-IL-Fe(CN)[sub.6] [sup.3−]/PVA electrode might provide useful information for further developing integrated Fe(CN)[sub.6] [sup.3−]-mediated biosensors as H[sub.2]O[sub.2] is extensively involved in the classic reaction containing oxidase enzymes.