Nanostructured porous MnO2 on Ni foam substrate with a high mass loading via a CV electrodeposition route for supercapacitor application

Nanostructured porous MnO2 film on Ni foam substrate was fabricated via a CV electrodeposited route for the first time. The obtained MnO2 film had a 3D network structure and a high mass loading from 6 to 18 mg cm(-2). This material achieved a maximum specific capacitance of 2790 mF cm(-2) at 2 mA cm(-2) and 864 mF cm(-2) at 20 mA cm(-2), and the specific capacitance can be retained above 90% after 1000 cycles at 5 mA cm(-2). The fabricated AC//MnO2 asymmetric supercapacitor can reach a specific capacitance of 67 F g(-1) and an energy density of 37.22 Wh Kg(-1) with its capacitance retention of 80% after 1000 cycles at 2.5 mA cm(-2). (C) 2014 Elsevier Ltd. All rights reserved.