The e ffects of electrodep osition m ethods on the pseudocapac itive properties of nanostructu red Manganese d ioxide

Pseudocapacitors are electrochemical energy storag e device w ith higher power dens ity than batteries and highe r energy density than ordinary ca pacitors, w hich utilize a faradaic process [۱]. So far, several materials have been studied as the pseudocapacitor electrodes. A mongst all thes e material s, manganese oxide has been co nceived as a promising supercapacitive material because of its low cost, h igh electrochemical activity and more friendly environmental nature [۲]. It is well kno wn that the pseudo-ca pacitive reaction of MnO۲ is a surface reaction, only the surface or a very thin sur face layer of the oxide can parti cipate in this pse udo-capacitive reactio n. Along w ith differe nt methods for making manganese oxide, electroc hemical methods have several a dvantages like the better attachment to the electrode surface, simplicity, having a low cost and so on. The source of MnO۲ in t he most reports is a salt of Mn+۲ and a few reports exist fo r electrodeposition of MnO۲ from KMnO۴. In this study, we prepare d nanostru ctured ma nganese oxide by potentiostatic, galvanostatic and potenti odynamic electrodeposition.

کلیدواژه ها:

Nanostructure ، Electrodepos ition ، Man ganese dioxide ، Pseudo capacitor