Abstract
High quality MnO2/MnCo2O4 composites have been successfully synthesized by a one-step solution combustion process at 300°C for 2h in air. The effects of the amount of glycine and molar ratios of Mn/Co on phase composition, morphology and electrochemical properties of products were investigated. The prepared samples were characterized by X-ray diffraction, field-emission scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and Brunauer-Emmett-Teller methods. Based on the optimum fuel/oxidizer molar ratios, the products transformed from spinel MnCo2O4 granular aggregates to a mixture of MnO2/MnCo2O4 composites with increase the molar ratios of Mn/Co. The electrochemistry performance of prepared different specimens were evaluated and compared through cyclic voltammetry and charge-discharge anylysis in 2.0M KOH electrolytic solution. Electrochemical measurements showed that the MnO2/MnCo2O4 exhibited a optimal electrochemistry performance with the Mn:Co:glycine molar ratio of 3:4:31.5/9. The maximum specific capacitance of 497F/g is achieved at a current density of 0.5A/g (or 312F/g at 10A/g). The high electrochemical performance would be attributed to the numerous nanopores, large specific surface and synergistic effects of the MnO2 and spinel MnCo2O4.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
