Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1277209 | International Journal of Hydrogen Energy | 2012 | 7 Pages |
A nanoporous manganese oxide (MnO2) film was fabricated via a polystyrene templated electrodeposition in the solution containing MnSO4. The nanoporous MnO2 film obtained has been characterized by field emission scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge methods. The specific capacitance of 1018 F g−1 was observed at a low current density of 500 mA g−1. When the current density increased to 30.0 A g−1, the specific capacitance of 277 F g−1 remained. The high capacitance retention at high rates makes the prepared MnO2 a promising candidate for supercapacitor applications.
► An array of manganese oxide (MnO2) nanowall-spheres was fabricated using template via potentiodynamic electrodeposition. ► High specific capacitance of 1018 F g−1 was obtained at a low current density of 500 mA g−1. ► The maximum specific energy of sample reached 90.5 Wh kg−1, and almost 30% remained as stable value.