Fabrication and electrochemical characterization of two-dimensional ordered nanoporous manganese oxide for supercapacitor applications

摘要

A nanoporous manganese oxide (MnO_2) film was fabricated via a polystyrene templated electrodeposition in the solution containing MnSO_4. The nanoporous MnO_2 film obtained has been characterized by field emission scanning electron microscopy, cyclic voltam-metry, 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 MnO_2 a promising candidate for supercapacitor applications.