N-doped carbon nanofibers arrays as advanced electrodes for supercapacitors

The advancement of supe rcapacitors largely relies on the innovation of electrode materials with high-rate performance and ultra-long cycling stability.In this work,unique N-doped nanofibers on carbon cloth（NCNFs/CC） are prepared by an electrodepositio n-annealing method for application in supercapacitors.The as-prepared N-doped nanofibers（N-CNFs） show diameters of 100-150 nm and cross-link with each other fo rming porous conductive network.Due to enhanced conductivity and reinforced structural stability,the N-CNFs/CC arrays are demonstrated with better electrochemical performance than CNFs/CC counterpart,including higher specific capacitance(195.2 F g;at a current density of 2.5 A g;),excellent rate capability(80.5.% capacity retention as the rate increases from 2.5-20 A g;) and good cycling stability（99.5.%retention after 10,000 cycles）.These reinforced electrochemical properties are attributed to N-doped conductive architecture with faster ion/electron transfer paths and more active sites.Our findings may offe r a new way for construction of advanced high-rate electrodes for energy storage.