ZnCl2 regulate flax-based porous carbon fiber for long cycle stability supercapacitors

The flax fiber with abundant sources and low cost is an excellent precursor of carbon fiber for supercapacitor. At present, it is very attractive designing high electrochemical performance electrode via a simple and green way. Hence, we systemically control the specific surface area and pore structure of flax-based carbon fiber by impregnating ZnCl2 solution. The results show that the dehydration and expansion effects of ZnCl2 affect the microstructure, which is directly related to specific capacitance. After activation, the optimized electrode exhibited highest specific capacitance of 105 F g-1 at current density of 1 A g-1, which has been improved by more than 10 times than pure-flax based carbon fiber. Moreover, it also shows the excellent cycle stability of 98.7% after 10000 cycles even at high current density of 10 A g-1. These results furtherly demonstrate that flax-based electrode have more competitive potential to apply some relevant energy storage application in the future.