Hetero-structured MnO-Mn3O4@rGO composites: Synthesis and nonenzymatic detection of H2O2

https://doi.org/10.1016/j.msec.2020.111443Get rights and content

Highlights

  • Hetero-structured olive-like MnO-Mn3O4@rGO was designed and synthesized by a facile solvothermal-calcination treatment.

  • MnO-Mn3O4@rGO/GCE displayed high electrocatalytic activity towards H2O2 reduction.

  • MnO-Mn3O4@rGO/GCE exhibited wide linear range of 0.004–17 mM with a high sensitivity of 247.15 mA mM−1 cm−2.

  • The as-proposed biosensor showed excellent anti-interference ability and stability.

Abstract

The construction of metal-oxide heterojunction architecture has greatly widened applications in the fields of optoelectronics, energy conversions and electrochemical sensors. In this study, olive-like hetero-structured MnO-Mn3O4 microparticles wrapped by reduced graphene oxide (MnO-Mn3O4@rGO) were synthesized through a facile solvothermal-calcination treatment. The morphology and structure of MnO-Mn3O4@rGO were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction. The as-synthesized MnO-Mn3O4@rGO exhibited prominent catalyzing effect on the electroreduction of H2O2, due to the combination of good electrical conductivity of rGO and the synergistic effect of MnO and Mn3O4. The MnO-Mn3O4@rGO modified glassy carbon electrode provided a wide linear response from 0.004 to 17 mM, a low detection limit of 0.1 μM, and high sensitivity of 274.15 μA mM−1 cm−2. The proposed sensor displayed noticeable selectivity and long-term stability. In addition, the biosensor has been successfully applied for detecting H2O2 in tomato sauce with good recovery, revealing its promising potential applications for practical electrochemical sensors.

Keywords

Hetero-structured
MnO-Mn3O4@rGO
H2O2
Electroreduction

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