Surfactant-assisted Pulse Electrodeposition of Hausmannite Nano-rods/particles with Improved Pseudocapacitive Performance

Abstract

Pulse cathodic electrodeposition of manganese oxide was performed from 0.005M MnCl2 in the presence of cetyl trimethylammonium bromide (CTAB). The electrosynthesis experiments were done at the simple pulse mode (ton=1ms and toff=1ms) with applying current density of 10 mA cm–2. The structural analyses through XRD and FTIR revealed that the prepared sample have the pure hausmannite crystal structure. Morphological observations by SEM showed that the deposited hausmannite has mixed rod/particle morphology. The charge storage performances of the prepared hausmannite were evaluated by cyclic voltammetry and charge-discharge techniques. The Mn3O4 working electrode exhibited only 13% capacity decay after 1000 cycles at the current load of 2 A g–1, and its SC value reduced from 239 F g–1 to 207 F g–1. The results proved that the prepared Mn3O4 nano-rods/particles are suitable electrode material for supercapacitors.