Nickel-Manganese Layered Double Hydroxide Nanosheets Supported on Nickel Foam for High-performance Supercapacitor Electrode Materials

Well-aligned hierarchical NiMn-layered double hydroxide (NiMn-LDH) nanosheets are successfully grown on Ni foam by a facile one-step wet-method, wherein urea hydrolysis supplies alkali and carbonate ion. As-obtained NiMn-LDH@Ni foam presents highly oriented layered structure with ultrathin nanosheets. By fine tuning Ni/Mn mole ratio, the optimized Ni3Mn1-LDH@Ni foam displays maximum specific capacitance (1511 F g(-1) at 2.5 A g(-1)), excellent rate capability (80.1% retention at 48 A g(-1)), high coulombic efficiency and long-term cycling life. In principle, this work provides a rapid and tunable strategy approach for synthesis of NiMn-LDH with largely enhanced supercapacitor behavior. (C) 2016 Elsevier Ltd. All rights reserved.