Synthesis of Birnessite-Type MnO2 by the In-Situ Electrochemical Oxidation of Mn3O4 Film for Supercapacitors
Synthesis of Birnessite-Type MnO2 by the In-Situ Electrochemical Oxidation of Mn3O4 Film for Supercapacitors
- Nanoscience And Nanotechnology Letters, 4(5). p.559-563, 2012 .
Artículo
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 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.
MANGANESE OXIDE
ELECTROCHEMICAL OXIDATION
SUPERCAPACITOR
Artículo
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 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.
MANGANESE OXIDE
ELECTROCHEMICAL OXIDATION
SUPERCAPACITOR