The performance of activated carbon in Al-ion based supercapacitors

摘要

Activated carbon(AC),an extraordinary material,is vital in supercapacitor applications.The use of flower stalks from coconut tree(FSCT),as a raw material for synthesis is the highlight of our research.AC is produced by utilizing aluminium chloride hexahydrate(AlCl3.6H2O)as an activating agent in the chemical activation procedure.The BET surface area of the synthesized carbon material is about 50 m~2g~(-1)with high content of micropores.In this context,most of the pores have a 0.5-1 nm diameter.AC demonstrates excellent electrochemical performance in 5M aqueous aluminium nitrate nonahydrate(A1(NO3)3-9H2O)electrolyte and exhibits a specific capacitance value of 64 Fg~(-1)at 0.1 Ag~(-1)and equivalent serial resistance(ESR)of 23 Ω,measured by impedance spectroscopy.It is worth noting that the retention of the capacitance of the electrode was sufficiently high even after 1000 cycles.