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We demonstrate a simple and highly efficient strategy to synthesize MnO_2/nitrogen-doped ultramicroporous carbon nanospheres(MnO_2/N-UCNs) for supercapacitor application.MnO_2/N-UCNs were fabricated via a template-free polymerization of resorcinol/formaldehyde on the surface of phloroglucinol/terephthalaldehyde colloids in the presence of hexamethylenetetramine,followed by carbonization and then a redox reaction between carbons and KMnO_4.As-prepared MnO_2/N-UCNs exhibits regular ultramicropores,high surface area,nitrogen heteroatom,and high content of MnO_2.A typical MnO_2/N-UCNs with 57 wt.%MnO_2 doping content(denoted as MnO_2(57%)/N-UCNs) makes the most use of the synergistic effect between carbons and metal oxides.MnO_2(57%)/N-UCNs as a supercapacitor electrode exhibits excellent electrochemical performance such as a high specific capacitance(401 F/g at 1.0 A/g) and excellent charge/discharge stability(86.3%of the initial capacitance after 10,000 cycles at 2.0 A/g) in 1.0 mol/L Na_2SO_4 electrolyte.The well-designed and high-performance MnO_2/N-UCNs highlight the great potential for advanced supercapacitor applications.
We demonstrate a simple and highly efficient strategy to synthesize MnO 2 / nitrogen-doped ultramicroporous carbon nanospheres (MnO 2 / N-UCNs) for supercapacitor application. MnO 2 / N-UCNs were fabricated via a template-free polymerization of resorcinol / formaldehyde on the surface of phloroglucinol / terephthalaldehyde colloids in the presence of hexamethylenetetramine, followed by carbonization and then a redox reaction between carbons and KMnO_4.As-prepared MnO_2 / N-UCNs exhibits regular ultramicropores, high surface area, nitrogen heteroatom, and high content of MnO_2.A typical MnO 2 / N-UCNs with 57 wt.% MnO 2 doping content (denoted as MnO 2 (57%) / N-UCNs) makes the most use of the synergistic effect between carbons and metal oxides. a supercapacitor electrode exhibits excellent electrochemical performance such as a high specific capacitance (401 F / g at 1.0 A / g) and excellent charge / discharge stability (86.3% of the initial capacitance after 10,000 cycles at 2.0 A / g) L Na _2SO_4 electrolyte.The well-designed and high-performance MnO_2 / N-UCNs highlight the great potential for advanced supercapacitor applications.