An Efficient Electrochemical Sensing of Hydrogen Peroxide on Zn-Based Coordination Polymer Decorated Carbon Paste Electrode

Abstract

Due to the important role of hydrogen peroxide (H2O2) in biological systems and its wide range of practical applications, the development of efficient electrochemical H2O2 sensors has become a highly attractive research area. Herein, we reports the synthesis and fabrication of zinc-based coordination polymer [Zn(bim)(L1)(Cl)]n (CP-a): [bim = 1-benzylimidazole, L1 = terephthalic acid] on modified carbon paste electrode (CP-a/CPE) for the electrochemical detection of H2O2. The surface morphology of CP-a/CPE was confirmed by field emission scanning electron microscopy. Electrochemical sensing features were evaluated by cyclic voltammetry and chrono-amperometry. The linear range at the potential of −0.5 V based on CP-a/CPE for H2O2 was 0.001 mM–60 mM, with a low detection limit (LOD) of 0.0004 mM. The effect of interfering species on the reduction peak current response shows a minor change of signals (>5%). The as-synthesized CP-a/CPE sensor exhibited efficient reproducibility and stability. The electrocatalytic activity and good performance imply that the metal-based coordination polymers are potential candidates for fabricating electrochemical sensors.