A Novel Hydrogen Peroxide Amperometric Sensor Based on Hierarchical 3D Porous MnO₂−TiO₂ Composites

Abstract

Abstract A novel nanocomposite electrode based on hierarchical 3D porous MnO 2 −TiO 2 for the application in hydrogen peroxide (H 2 O 2 ) sensors has been explored. This electrode was fabricated by growing TiO 2 cross‐linked nanowires on a commercial fluorine tin oxide (FTO) glass via a hydrothermal process and subsequent deposition of 3D honeycomb‐like MnO 2 nanowalls using an electrodeposition method (denoted as 3D MNS‐TNW@FTO). The obtained 3D MNS‐TNW@FTO electrode was characterized by scanning electron microscopy (SEM), Raman spectroscopy, X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS). Based on such a unique 3D porous framework and the existence of MnO 2 , the electrode demonstrates a good performance in the detection of H 2 O 2 , with two linear ranges from 9.8 to 125 μM and 125 μM–1.0 mM, a good selectivity of 8.02 μA mM −1 cm −2 , and a low detection limit of 4.5 μM. In addition, the simplicity of the developed low‐cost fabrication process provides an efficient method for the mass production of electrocatalytical MnO 2 −TiO 2 nanocomposites on commercial FTO glass for H 2 O 2 sensing applications and can be adapted for other electrochemical sensors for various biochemical targets. It thus is beneficial for the practical usage in bioanalysis.