Cathodic electrodeposition of MnO2 from a nitrate solution, via pulsed base (OH-) electrogeneration was performed for the first time. The deposition experiments were performed in a pulse current mode in typical on-times and off-times (i.e. t(on) = 1 s and t(off) = 1 s) with a peak current density of 2 mA cm(-2) (I-a = 2 mA cm(-2)). The structural characterizations conducted by XRD and FTIR techniques revealed that the prepared MnO2 is composed of both alpha and gamma phases. Morphological observation by SEM and TEM showed that the prepared MnO2 is made up of nanobelts with uniform shapes (an average diameter and length of 50 nm and 1 mu m, respectively). Further electrochemical measurements by cyclic voltammetry and charge-discharge techniques revealed that the prepared MnO2 nanostructures have excellent capacitive behaviors, like a specific capacitance of 235.5 F g(-1) and capacity retention of 91.3% after 1000 cycling at the scan rate of 25 mV s(-1). (C) 2015 Elsevier B.V. All rights reserved.