Bubble Carbon nanofibers Decorated with MnO2 Nanosheets as High Performance Supercapacitor Electrode
In this work, we have successfully prepared carbon nanofibers with stringed in nanobubbles, as so called bubble carbon nanofibers (B CNFs) The B CNFs were obtained by exploding polyacrilonitrile (PAN) nanofibers with embedded ZnO nanoparticles as "bombs" during carbonization process at a temperature of 1000 degrees C. Benefiting from the easy electron transport path and high specific surface area, the B CNFs show a high specific capacitance of 428 F g( 1) at 1 A g( 1) after decorated with MnO2 nanosheets, which is significantly superior to carbon fibers (CNFs)/MnO2 (203 F g( 1) in the same situation. Moreover, it exhibits an excellent cycling stability with about 98.8% of the initial specific capacitance maintained after 1500 test cycles. This study provides an effective strategy to fabricate porous carbon nanomaterials as well as improve the capacitive performance of carbon based supercapacitors. (C) 2016 Elsevier Ltd. All rights reserved.