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http://dx.doi.org/10.5229/JECST.2012.3.4.178

Electrodeposited Nano-flakes of Manganese Oxide on Macroporous Ni Electrode Exhibiting High Pseudocapacitance  

Gobal, F. (Department of Chemistry, Sharif University of Technology)
Jafarzadeh, S. (Department of Chemistry, Sharif University of Technology)
Publication Information
Journal of Electrochemical Science and Technology / v.3, no.4, 2012 , pp. 178-184 More about this Journal
Abstract
A porous nickel (P-Ni) substrate was prepared by selective leaching of zinc from pressed pellets containing powders of Ni & Zn in 4 M NaOH solution. Anodic deposition of manganese oxide onto the porous Ni substrate ($MnO_x$/P-Ni) formed nano-flakes of manganese oxide layers as revealed in SEM studies. Pseudocapacitance of this oxide electrode was evaluated by cyclic voltammetry (CV) and chronopotentiometry (CHP) in 2 M NaOH solution. The specific capacitance of the Mn oxide electrode was as high as 1515 F $g^{-1}$, which was ten times higher than Mn oxide deposited on a flat Ni-ribbon. 80% of capacity was retained after 200 charge/discharge cycles. The system showed no loss of activity in dry form over period of days. The impedance studies indicated highly conducting $MnO_x$/P-Ni substance and the obtained specific capacitance from impedance data showed good agreement with the charge/discharge measurements.
Keywords
Mn oxide; Nano-flakes; Porous Ni substrate; Supercapacitor;
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