Emerging CoMn-LDH@MnO2 electrode materials assembled using nanosheets for flexible and foldable energy storage devices

CoMn layered double hydroxides (CoMn-LDH) are promising electrode materials for supercapacitors because of their excellent cyclic stability. However, they possess relatively low capacitances. In this work, hybrid CoMn-LDH@MnO2 products grown on Ni foams were obtained through a facile hydrothermal method. The as-synthesized samples employed as electrodes deliver a specific capacitance of 2325.01 F g(-1) at 1 A g(-1). An assembled asymmetric supercapacitor using these products as positive electrodes shows a maximum energy density of 59.73 W h kg(-1) at 100 0.09 W kg(-1). The prominent electrochemical performance of the as-prepared electrodes could be attributes to hierarchical structures. These findings suggest that hybrid structures might be potential alternatives for future flexible energy storage devices. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.