Mesoporous MnCo2O4.5 nanoneedle arrays electrode for high-performance asymmetric supercapacitor application

The aligned mesoporous nanoneedle arrays of MnCo2O4.5 (MNA-MnCo2O4.5) are synthesized on Ni foam by using a calcination -process assisted hydrothermal method. Each MnCo2O4.5 nanoneedle features abundant mesopores on the surface. The as-fabricated unique MNA-MnCo2O4.5 exhibits the prominent electrochemical performances as evidenced by the high specific capacity of 517.9 C g(-1) at 3.6 A g(-1) and 98.3% capacity retention after 1000 cycles at a current density of 7.2 Ag-1. An asymmetric MNAMnCO(2)O(4.5)//active carbon supercapacitor is further fabricated to explore the merits of MNA-MnCo2O4.5 electrode, which manifests i) an energy storage density of 40.5 Wh kg(-1) at 376 W kg(-1), ii) a power density of 3.06 kW kg (-1) at 19.3 Wh kg (-1) and iii) an outstanding long-term cycle stability with 7.3% capacity loss after 5000 cycles. These results indicate that the synthesized MNA-MnCo2O4.5 is promising towards the practical application as high-performance supercapacitor electrode in future. (C) 2017 Elsevier B.V. All rights reserved.