Mesoporous hybrid NiOx-MnOx nanoprisms for flexible solid-state asymmetric supercapacitors
Chengzhen Wei1, Cheng Cheng2, Lan Ma2
1Henan Province Key Laboratory of New Opto-Electronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455000 Henan, P. R. China. chengzhenweichem@126.com huanpangchem@hotmail.com panghuan@yzu.edu.cn and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 Jiangsu, P. R. China.
Abstract:
Mesoporous hybrid NiOx-MnOx nanoprisms have been successfully prepared in this work. The synthesis process involves a facile solvothermal method for preparation of Ni-Mn precursor particles and a subsequent annealing treatment. These mesoporous hybrid NiOx-MnOx nanoprisms have a high surface area of 101.6 m(2) g(-1). When evaluated as electrode materials in supercapacitors, the as-prepared mesoporous hybrid NiOx-MnOx nanoprisms deliver a specific capacitance of 1218 F g(-1) at a current density of 2.0 A g(-1). More importantly, the mesoporous hybrid NiOx-MnOx nanoprisms were successfully used to construct flexible solid-state asymmetric supercapacitors. The device shows a specific capacitance of 149.1 mF cm(-2) at 2.0 mA cm(-2), a good cycling stability with only 2.9% loss of capacitance after 5000 charge-discharge cycles, and good mechanical flexibility under different bending angles. These results support the promising application of mesoporous hybrid NiOx-MnOx nanoprisms as advanced supercapacitor materials.
