Enhanced cycle performance of hierarchical porous sphere MnCo2O4 for asymmetric supercapacitors

A binary transition metal oxides MnCo2O4 with hierarchical porous sphere structure (MnCo2O4 PSs) electrode material for supercapacitor was prepared by a moderate methanol solvothermal and calcination method. The MnCo2O4 PSs presents a large specific surface area (213.2 m(2) g(-1)). Hierarchical porous sphere is beneficial for forming conductive networks and furnishing more electrochemically active sites. Amazingly, the MnCo2O4 PSs exhibits brilliant electrochemical properties that a relatively high specific capacitance of 1044 F g(-1) and remarkable cycling stability (133.3% retention after 10000 cycles) are owned. A mimetic asymmetric supercapacitor (ASC) was constructed by the MnCo2O4 PSs and the starch-derived carbon foam material (SCF) as positive and negative electrode, respectively. The MnCo2O4 PSs//SCF ASC shows excellent specific energy (42.27 Wh kg(-1)) at the specific power of 400 W kg(-1) under the optimal output potential difference of 1.6 V and long-term cycling stability. Herein, the MnCo2O4 PSs electrode material prepared in this work is a distinguished candidate material for supercapacitor. (C) 2019 Elsevier Ltd. All rights reserved.