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论文类型：期刊论文

发表时间：2012-05-01

发表刊物：NANOSCIENCE AND NANOTECHNOLOGY LETTERS

收录刊物：SCIE、EI、Scopus

卷号：4

期号：5,SI

页面范围：559-563

ISSN号：1941-4900

关键字：Manganese Oxide; Electrochemical Oxidation; Supercapacitor

摘要：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.