Formation of Highly Dispersed Ultrafine MnO₂ Nanoparticles on Nitrogen-doped Porous Carbon for Supercapacitor Applications

摘要

Formation of transition metal oxide doped nanostructures with high surface area is highly desirable forelectrochemical applications. Here, ultrafine MnO 2 nanoparticles dispersed nitrogen-doped porouscarbons (MnO 2 /N-C) was synthesized using chitosan and Mn(NO 3 ) 2 as precursor. The MnO 2 /N-Cdemonstrates outstanding supercapacitive properties and great potential for real-world applications.The capacitance of the nanocomposite is as high as 340.1 F g ?1 (1 A g ?1 ) in 1 M KOH solution. TheMnO 2 /N-C also shows high-rate capability, retaining a specific capacitance of 270.2 F g ?1 at 10 A g ?1 .The large specific surface area and highly-dispersed MnO 2 combined with its unique structuraladvantages, make it a very promising electrode material for energy storage devices.