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

• DOI: 10.1016/j.electacta.2014.05.074
• Publication Date: 2014-05-23T10:00:25Z
• Authors: Jie Yang; Lifang Lian; Hongcheng Ruan; Fengyan Xie; Mingdeng Wei
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract 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 .