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

• Hierarchical NiMn-LDH nanosheets with well-aligned and highly oriented are successfully grown on Ni foam.
• Rapid, ease of operation and tunable strategy: urea hydrolysis method.
• High specific capacitance: 1511.1 F g−1 at 2.5 A g−1, 0.67 F cm−2 at 3 mA cm−2.
• Excellent rate capability: 80.1% retention at 48 A g−1; good cyclic stability: capacitance retention 92.8% after 3000 cycling.

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.

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