Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-05-01

Journal: NANOSCIENCE AND NANOTECHNOLOGY LETTERS

Included Journals: Scopus、EI、SCIE

Volume: 4

Issue: 5,SI

Page Number: 559-563

ISSN: 1941-4900

Key Words: Manganese Oxide; Electrochemical Oxidation; Supercapacitor

Abstract: Here we report an in situ electrochemical oxidation method to synthesize birnessite-type MnO2 electrodes for supercapacitors from cathodically deposited Mn3O4 thin films. Mn3O4 thin films composed of nanowall arrays with a porous structure were prepared by cathodic deposition at various temperatures. Nanoparticles were formed within the nanowalls when the deposition temperature is above 50 degrees C, building a nanoparticle/porous hierarchy architecture. Cyclic voltammogram (CV) was used to perform electrochemical oxidation on the Mn3O4 thin film. The birnessite-type MnO2 phase was successfully achieved after the electrochemical CV cyclings, which is believed to be responsible for the significant increase in the specific capacitance of the supercapacitor.