New insights into the mechanism of pseudocapacitance deterioration in electrodeposited MnO2 under negative potentials (CROSBI ID 199597)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Sopčić, Suzana ; Peter, Robert ; Petravić, Mladen ; Mandić, Zoran
engleski
New insights into the mechanism of pseudocapacitance deterioration in electrodeposited MnO2 under negative potentials
The mechanism of deterioration of the capacitive response of electrodeposited MnO2 under reducing potentials has been studied by combined electrochemical and quartz crystal microbalance, XPS and SEM techniques. Cycling of the electrode towards cathodic potentials of −0.3 V vs. Ag/AgCl leads to irreversible reduction resulting in low valence manganese oxide, most probably Mn2O3. The reduction is accompanied by phase transformation with the uptake of considerable amounts of water into the layer. The capacitive behaviour of the MnO2 electrode fades with prolonged cycling with the concomitant change of charging/discharging mechanism.
MnO2 ; supercapacitors ; capacitance deterioration ; EQCM
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Podaci o izdanju
240
2013.
252-257
objavljeno
0378-7753
1873-2755
10.1016/j.jpowsour.2013.04.008
Povezanost rada
Kemija, Kemijsko inženjerstvo