Carbon screen-printed electrodes modified with composite films based on silica for H₂O₂ determination

Abstract

In this study, a nanostructured screen-printed carbon electrode (nanoSPCE) was modified with silica-based composite films containing metal oxides (MnO₂ or CuO) without and with graphene oxide (GO). According to scanning electron microscopy results, uniform thin films with encapsulated metal oxides and GO were formed on the surface of nanoSPCEs. The electrochemical parameters of the modified electrodes were measured by cyclic voltammetry for the non-enzymatic determination of H₂O₂. Because of the combined action of GO and metal oxides, the modified electrodes have improved electrocatalytic performance for the determination of H₂O₂ in phosphate buffer solutions. NanoSPCE/MnO₂/GO/SiO₂ and nanoSPCE/CuO/GO/SiO₂ exhibited stable current-voltage responses and good sensing for H₂O₂ with a wide linear detection range of 0.005–0.5 mM and 0.05–0.3 mM, respectively.

Keywords:

• Carbon nanostructured screen-printed electrode
• copper(II) oxide
• graphene oxide
• manganese(IV) oxide
• non-enzymatic determination of hydrogen peroxide
• silica film

Additional information

Funding

This work is supported in part by the Ministry of Education and Science of Ukraine, Grant No. [0118U001125] and Grant No. [0120U104126].