A web of poly(bisbenzimidazolatocopper(ii)) around multiwalled carbon nanotubes for the electrochemical detection of hydrogen peroxide

Abstract

The present work focuses on the electrochemical determination of hydrogen peroxide (H₂O₂), using poly(bisbenzimidazolatocopper(II)) coordinated multiwalled carbon nanotube modified glassy carbon electrode (MWCNT/(BIM–Cu²⁺)_n@GCE). The physical characterization techniques point to the coordination of the polymer web around MWCNT. The electrode matrix developed was employed for the electrochemical estimation of H₂O₂. The polymer works better in the presence of the MWCNT as it acts as conducting spokes, which is significant for the successful electrochemical sensing of H₂O₂. To the best of our knowledge, this type of coordination polymer web for sensing peroxide is reported for the first time. In amperometric sensing, the electrode exhibited an H₂O₂ detection limit of 7.8 × 10⁻⁷ M and a sensitivity of 5 nA μM⁻¹. The effectiveness of the electrode was further proved via interference study and applying it to H₂O₂ sensing in real samples.