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Erschienen in:
05.04.2016
Electrochemical preparation and supercapacitive performance of α-MnO2 nanospheres with secondary wall-like structures
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2016
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Abstract
A new approach has been proposed for the preparation of nanostructured α-MnO2. The method is based on the galvanostatic cathodic electrodeposition of the product from a nitrate bath under a direct current mode at a current density of 0.1 mA cm−2. The intermediate product deposited in this stage is next thermally treated at 300 °C for 3 h. To evaluate the properties of the final product, it was characterized by XRD and FTIR so as to gain information on its phase composition (which was found to be mainly α-MnO2) and SEM to gain information on its morphology (which was found to be nanospheres with secondary porous wall-like nanostructures). Additional electrochemical experiments on the product through cyclic voltammetry and charge–discharge tests revealed it to be capable of delivering high specific capacitance of 280 F g−1, further its outstandingly long-term cycling stability which was only diminished to 95.4 % of the initial value after 1000 discharge cycles.