Three-Dimensional (3D) Nanocomposites of MnO₂-Modified Mesoporous Carbon Filled with Carbon Spheres/Carbon Blacks for Supercapacitors

摘要

Herein, three-dimensional (3D) nanocomposites of diverse carbon materials, (e.g., mesoporous carbon(MC) filled with carbon spheres (CS) and carbon blacks (CB)) and MnO2 were synthesized andexplored for high-performance supercapacitors. By tuning the amount of KMnO4 the morphology andpore structure of MC-CS-MnO2 and MC-CB-MnO2 nanocomposites could be controlled. A series ofelectrochemical measurements were performed, exhibiting higher specific capacitance and stablecycling performance of the 3D nanocomposites. Meanwhile, MC-CS-MnO2 demonstrated the larger-1 specific capacitance of 326 F g and interestingly an increase specific capacitance for MC-CB-MnO2was found after 1000 cycles. In principle, these findings show great potential in developing longcycling and electrochemically stable supercapacitors.