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

Highlight•Nanostructured porous MnO2 film on Ni foam substrate was synthesized via a CV route for the first time.•The obtained MnO2 film has a 3D network structure and a high mass loading.•An asymmetry supercapacitor composed of MnO2 film (positive electrode) and active carbon (AC, negative electrode) was fabricated for the first time.•An asymmetric supercapacitor of AC//MnO2 displayed a capacitance of 67 F g−1 and an energy density of 37.22 Wh Kg−1.•The capacitance retention of 80% after 1000 cycles was reached for an asymmetric supercapacitor.

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.

Graphical abstractNanostructured porous MnO2 films on Ni foam substrate were fabricated via a CV electrodeposited route for the first time and exhibited a maximum specific capacitance of 2790 mFcm−2 at 2 mA cm−2. An asymmetric supercapacitor of AC//MnO2 displayed a specific capacitance of 67 F g−1 and an energy density of 37.22 Wh Kg−1.Figure optionsDownload full-size imageDownload as PowerPoint slide