Abstract
A rapid and facile microwave-assisted hydrothermal route has been developed to synthesize MnO2 nanocrystals with exquisitely tuned structures/morphologies by reducing potassium permanganate in the presence of hydrochloric acid. δ-MnO2 microspheres, α-MnO2 nanorods, γ-MnO2 nanosheets and β-MnO2 octahedrons have been obtained with 0.05, 0.10, 0.25 and 0.75mL HCl (37wt%), respectively. More importantly, γ-MnO2 nanosheets and β-MnO2 octahedrons were prepared for the first time by a one-step microwave-assisted method. The electrocatalytic activities of the synthesized MnO2 in KOH solution have been determined by cyclic voltammetry and the results show that all manganese dioxides can catalyze the oxygen reduction reaction (ORR) in alkaline medium with different catalytic activities. α-MnO2 nanorods appear to hold the highest catalytic activity due to their crystal phase/morphology with appropriate oxygen adsorption mode.
Sign-in/Register to access full text options 
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.
