Electrochemical study of novel composite electrodes based on glassy carbon bulk-modified with Pt and MoO2 nanoparticles supported onto multi-walled carbon nanotubes

Abstract

This paper reports the preparation and electrochemical study of new glassy carbon electrode (GCE) bulk-modified with synthesized hybrid materials: Pt and MoO2 nanoparticles deposited on the multi-walled carbon nanotubes (MWCNTs). The results of electrochemical study of commercial GCE and electrodes modified with Pt–MWCNT and MoO2–MWCNT were obtained by cyclic voltammetry in K4Fe(CN)6 and NaOH solutions. Morphology and structure of the synthesized hybrid materials were analysed using the method of high resolution transmission electron microscopy, indicating the presence of well dispersed nanoparticles of Pt and MoO2 over MWCNT network. The results of the electrochemical study show that the capacitance of electrode modified with MoO2–MWCNT and Pt–MWCNT is 62–65 times higher than the capacitance of the commercial GCE. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-68/2020-14/200124]

Keywords

• multi-walled carbon nanotubes
• platinum
• molybdenum dioxide
• cyclic voltammetry