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Pulse Electrosynthesis of MnO 2 Electrodes for Supercapacitors
Author(s) -
Su Yisong,
Zhitomirsky Igor
Publication year - 2014
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400077
Subject(s) - electrosynthesis , supercapacitor , materials science , electrode , capacitance , electrolyte , electrochemistry , power density , energy storage , optoelectronics , nanotechnology , chemical engineering , power (physics) , chemistry , physics , quantum mechanics , engineering
ABSTRACT Experimental results on cathodic electrosynthesis of MnO 2 electrodes for electrochemical supercapacitors are presented. The deposition yield data at different pulse durations and electrosynthesis mechanism are discussed. Electron microscopy investigations show porous structure of the electrodes, which is beneficial for good electrolyte access to the active material. The capacitance of 2.6 F cm –2 (199 F g –1 ), energy density of 20 Wh kg –1 and power density of 28 kW kg –1 are achieved for 13 mg cm –2 electrodes. The electrodes show improved capacitance retention at high scan rates. The Ni plaque‐based MnO 2 electrodes are promising for energy storage applications in electrochemical supercapacitors.