Electrochemical preparation of MnO2 nanobelts through pulse base-electrogeneration and evaluation of their electrochemical performance

Abstract Cathodic electrodeposition of MnO 2 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 MnO 2 is composed of both α and γ phases. Morphological observation by SEM and TEM showed that the prepared MnO 2 is made up of nanobelts with uniform shapes (an average diameter and length of 50 nm and 1 μm, respectively). Further electrochemical measurements by cyclic voltammetry and charge–discharge techniques revealed that the prepared MnO 2 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 .

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