Ctab-Assisted Cathodic Electrosynthesis of Mno2 Ultra-Fine Nanoparticles and Investigation of Their Charge Storage Performance Publisher



Aghazadeh M¹ ; Ganjali MR^{2, 3} ; Maragheh MG¹
Source: International Journal of Electrochemical Science Published:2018

Abstract

Cathodic electrodeposition of MnO2 was performed from 0.005M MnCl2 in the presence of cetyl trimethylammonium bromide (CTAB). The electrosynthesis experiments were done at a simple direct current (DC) mode by applying current density of 0.5 mA cm-2 and RT conditions. The obtained brown deposit was then calcined at 300°C for 2h to form the final manganese oxide. Thermal behavior of deposited hydroxide was investigated via thermogravimetric data i.e. DSC-TGA. The structural analysis through XRD and FTIR revealed that the prepared MnO2 is composed of both α and γ phases. Morphological observations by SEM and TEM exhibited that the prepared and final oxide are composed of completely uniform spherical particles with fine sizes of about 10 nm. The charge storage performances of the prepared MnO2 nanoparticles were measured by cyclic voltammetry and charge-discharge techniques, which revealed that the produced MnO2 nanoparticles are capable to deliver specific capacitance as high as 232 and 181 F g-1 at current loads of 0.5 and 2 A g-1 and capacity retentions of 91.89% and 88.25% after 2000 cycling at these current loads. The electrochemical data proved the suitability of the manganese oxide fine particle for use in supercapacitor as electrode material. © 2018 The Authors.