Hierarchical Ni-Mn layered double hydroxide grown on nitrogen-doped carbon foams as high-performance supercapacitor electrode

Hierarchical Ni-Mn Layered Double Hydroxide (Ni-Mn LDH) nanosheets grow on a nitrogen-doped carbon foam skeleton through a one-step hydrothermal reaction. LNCF-2 exhibits high specific capacitance (2128.3 F g(-1) at 0.5 A g(-1)) and good cyclic stability (94.3% retention after 5000 cycles at 2 A g(-1)) as an electrode material for supercapacitors. Furthermore, as a positive electrode material for an asymmetric supercapacitors (ASCs), it also has a high specific capacitance (125.1 F g(-1) at 0.5 A g(-1)) and an excellent cyclic stability (80.1% retention after 10000 cycles at 5 A g(-1)). The increase in electrochemical performance is attributed to the high Faradaic pseudocapacitance of Ni-Mn LDH and the introduction of three-dimensional carbon foam. Because the introduction of three-dimensional carbon foam can provide an interconnection network for electron and ion transfer, allowing efficient charge exchange. (C) 2018 Published by Elsevier Ltd.