Facile Fabrication of Mn₂O₃ Nanoparticle-Assembled Hierarchical Hollow Spheres and Their Sensing for Hydrogen Peroxide

Abstract

In the present work, we described the facile hydrothermal fabrication of Mn2O3 nanoparticle-assembled hierarchical hollow spheres and their application for the electrochemical determination of hydrogen peroxide (H2O2). The composition and morphology of the as-prepared samples were well characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Because of the electrochemical responses toward H2O2, a novel nonenzymatic electrochemical sensor for the H2O2 determination based on Mn2O3 hollow spheres modified glassy carbon electrode was proposed. The electrochemical properties of the modified electrode were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The modified electrode displayed distinct amperometric response to H2O2 in a wide concentration range 0.10-1276.5 μM, with a linear range of 0.10-126.5 μM and a detection limit of 0.07 μM (S/N = 3). It exhibited excellent analytical performance in terms of long-time stability, good reproducibility and acceptable anti-interference ability. In addition, it was applied for the H2O2 determination in real samples directly with acceptable accuracy and recovery, demonstrating its potential application in routine H2O2 analysis.

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

“…Carbonaceous (C) spheres were chosen as the removable template, as has been used in other studies to produce hollow materials such as TiO2 30 , Mn2O3 31 and MnO2 17 . The C spheres have the advantages of ease of large-scale preparation, good dispersion in solvents, and easy removal by calcination in air.…”

Colloids of Holey Gd2O3 Nanosheets Converted from Exfoliated Gadolinium Hydroxide Layers

“…However, a great deal of research has focused on the development of alternative materials due to the high cost and scarcity of platinum. Metal oxides such as Fe 3 O 4 MnO, and Mn 2 O 3 have been used for the electrochemical detection of H 2 O 2 due to their greater stability and lower cost, but the electrocatalytic performance of these single component NPs was still not sensitive enough, possibly due to their spherical morphology and low electrical conductivity . To date, most attempts to fabricate H 2 O 2 sensors have involved depositing catalytic materials with spherical morphologies onto 2D structured templates, such as graphene coated on an electrode.…”

Facile synthesis of electrospinning Mn2O3-Fe2O3 loaded carbon fibers for electrocatalysis of hydrogen peroxide reduction and hydrazine oxidation

“…4a, which may be attributed to the film formed on the electrode by Nafion. This is because Nafion has negative charges after ionization and hinders the diffusion of Fe(CN) 6 3-/4-by the electron-electron repulsion [34]. By contrast, the semicircular portion of the electrodes modified with as-prepared samples markedly decreases, which means lower electron transfer resistance.…”

“…However, there are still some problems in the application of manganese oxides to analyze small molecules, such as the narrow linear range and long response time of H 2 O 2 and N 2 H 4 detection [34,35]. Hence, better catalytic activity of manganese oxides is still expected.…”