Fabrication of the porous MnCo2O4 nanorod arrays on Ni foam as an advanced electrode for asymmetric supercapacitors

In this work, the porous MnCo2O4 nanorod arrays on three-dimensional Ni foam (PMCN@NF) as electrode material have been fabricated through a mild co-precipitating reaction at room temperature followed by a subsequent thermal treatment. The PMCN@NF electrode material have been characterized by XRD, SEM, TEM, EDS-mapping, BET and XPS technologies. The capacitive performances of the PMCN@NF electrode have been investigated by CV, GCD and EIS. This porous structure possesses an average diameter of similar to 6.7 nm. BET interface area is measured to be 105.6 m(2) g(-1) for this PMCN@NF electrode. This PMCN@NF electrode exhibits the good capacitance of 845.6 F g(-1) (tested condition: 1 ampere per gram, 1 A g(-1)). After 2000 cycles test, it shows a 90.2% retention for specific capacitance of the first test. The MnCo2O4//rGO asymmetric supercapacitor with the stable opening voltage of 1.6 V delivers a maximum energy density of 53.7 Wh kg(-1) (when the power density is 1600 W kg(-1)). When this power density up to 8000 W kg(-1), it still achieves an energy density of 31.6 Wh kg(-1). The cyclic stability of this device after 5000 cycles can achieve an initial capacitance retention of 82.0%. These results indicate that the porous MnCo2O4 nanorod arrays electrode material is a promising functional material for advanced energy conversion and storage equipment. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.