Electrochemical properties of MnO2-based carbon nanomaterials for energy storage and electrochemical sensing

• Published in: Journal of materials science. Materials in electronics 2023-03, Vol.34 (8), p.731, Article 731
• Main Authors: Ouda, Emtinan, Yousf, Nehad, Magar, Hend S., Hassan, Rabeay Y. A., Duraia, El-Shazly M.
• Format: Article
• Language: English
• Subjects: Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Conjugation; Efficiency; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrodes; Electrolytes; Electron transfer; Energy storage; Graphene; Hydrogen peroxide; Manganese dioxide; Materials Science; Metal oxides; Morphology; Multi wall carbon nanotubes; Nanocomposites; Nanomaterials; Optical and Electronic Materials; Potassium; Science
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-10107-4

Electrochemical alongside the electro-catalytic properties of graphene and multi-walled carbon nanotubes have been improved via doping with manganese oxide nanostructures. Structural, morphological, and electrochemical properties of the as-synthesized nanocomposites were identified using XRD, FTIR, SEM, and electrochemical methods including cyclic voltammetry, and electrochemical impedance spectroscopy. The SEM images showed flower-like microsphere structures, while the conjugation of MnO 2  with the carbon nanomaterials was confirmed by the FTIR and XRD analysis. All MnO 2 -based nanocomposites provided great enhancement in their electrochemical activities with a larger value of specific capacitance than the individual constituents of carbon nanomaterials. Accordingly, hydrogen peroxide-directed detection was evaluated, whereas the nanocomposites exhibited direct electron transfer, fast and linear responses in the range from 1.0 to 210 µM. Thus, the significant enhancements in the electrochemical features acquired by the nanocomposites could suggest these nanomaterials for energy storage and hydrogen peroxide sensing applications.