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Title: Preparation of porous manganese hydroxide film and its application in supercapacitors
Authors: Fan, Zhen
Chen, Jinhua
Sun, Feng
Yang, Lei
Xu, Yan
Kuang, Yafei
Issue Date: May-2007
Publisher: CSIR
IPC Code: Int. Cl. ⁸ C25B1/21; C01G45/02; H01G4/33
Abstract: Preparation of a manganese hydroxide film by electrochemically induced deposition method is reported here. The morphology and crystal structure of the film have been investigated by scanning electron microscopy and X-ray diffraction, respectively. The possible deposition mechanism of the film is also discussed. Moreover, the capacitive properties of the film have been evaluated by cyclic voltammetry and galvanostatic charge-discharge method. The results indicate that the morphology of the deposits depends on the amount and size of evolved H₂ bubbles, which can be adjusted by changing the composition of electrolyte and deposition current density. The capacitive properties of film are affected by the deposition parameters. The film prepared under the optimum deposition conditions shows excellent capacitive properties: high specific capacitance (493 F g⁻¹ in 0.1 M Na₂SO₄ aqueous solution from 0 to 1 V at a current density of 1 mA cm⁻²), high electrochemical reversibility and excellent long-term charge-discharge cycle stability (2.2% loss of the specific capacitance observed at the 2000th cycle under the charge-discharge current density of 10 mA cm⁻²).
Page(s): 736-741
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.46A(05) [May 2007]

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