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

Due to the important role of hydrogen peroxide (H 2 O 2 ) in biological systems and its wide range of practical applications, the development of efficient electrochemical H 2 O 2 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 H 2 O 2 . 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 H 2 O 2 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.