Abstract
MnO2 film is directly grown on Ni foam substrate by a facile chemical bath deposition method. The microstructure characterization of as-prepared MnO2 film is conducted by SEM, XRD and nitrogen adsorption and desorption measurements. The β-MnO2 film consists of a large number of round nanoplatelets cross-linked with each other and forms 3D porous microstructure with a BET area of 80.6 m2 g−1 and an average pore diameter of 3.8 nm. The electrochemical performance of MnO2 film electrode is investigated by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge measurements. The obtained MnO2 film electrode without binder additive shows excellent pseudocapacitance behavior, delivering the maximum capacitance of 1517 F g−1 in KOH and 546 F g−1 in KNO3 at a current density of 1 A g−1. This study provides a facile method for preparation of three-dimensional MnO2 film with efficient supercapacitive properties.
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