Construction Of Nitrogen-doped Porous Car Bon/polyaniline Composite Electrode Materi Al And Its Application

Supercapacitors,as a new type of energy storage devices,have received researchers' extensive attention due to their a lot of advantages,such as wide operating temperature,high safety,maximum capacitance density,long cycle life and environmental friendliness,etc.Based on the charge storage mechanism,supercapacitors can be divided into faradaic capacitor and electrical double layer capacitor.The electrical double layer capacitor shows low capacitance,but the cycle stability is high,while the faradaic capacitor just the opposite,so the electrode material with two capacitive behavior has better performance.Polyaniline?PANI?is received extensive attention owing to it's good electrical conductivity,easy synthesis and low cost.But PANI shows low electrochemical stability,so it is necessary to ameliorate the cycle stability of PANI.Carbon material is the most promising support material owing to the double layer capacitance.Therefore,combining carbon materials and PANI to preparation of binary composite materials can effectively improve the cycle stability of PANI.In this paper,firstly to prepare a high-performance nitrogen doped porous carbon material as supporting material of polyaniline.An one-pot method has been developed to synthesize a new type of composite material,which can be used as carbon source to produce electrode material for supercapacitors.Specifically,zeolitic imidazolate framework-67?ZIF-67?crystal was synthesized firstly in 2-methylimidazol aqueous solution,then silica primary particles?from hydrolysis of tetraethylorthosilicate?and phenolic resin?from aggregation of resorcinol and formaldehyde?co-condensed on the surface of ZIF-67 crystal in the same system.The key to realize one-pot method is that 2-methylimidazol aqueous solution shows alkalescence,which can catalyze the hydrolysis of tetraethylorthosilicate and the aggregation of phenolic resin.After carbonization and remove of silica,the N-doped porous carbon?Carbon-ZSR?with high degree of graphitization,wide pore size distribution and maximum specific surface area was obtained.When it is used for supercapacitors as the electrode material,the Carbon-ZSR shows excellent electrochemical properties,large specific capacitance(305 Fg^-1 at 1 Ag^-1),high rate performance(229 Fg^-1 keeps at 10 Ag^-1)and excellent electrochemical stability(the specific capacitance maintains 98.4% after 5000 cycles at 10 Ag^-1),which suggest that the ZIF-derived nitrogen-doped porous carbon is an outstanding electrode material for energy storage devices.In situ polymerization of polyaniline on the surface of Carbon-ZSR to prapare binary composite materials.The experimental results show that Carbon-ZSR/PANI?1:5??the mass ratio of Carbon-ZSR and aniline is 1:5?has the best electrochemical performance,the specific capacitance is 518 Fg^-1 at 1 Ag^-1,and the specific capacitance still retains 421 Fg^-1 at 10 Ag^-1,indicating that Carbon-ZSR/PANI?1:5?has high rate performance.At the same time,the specific capacitance of Carbon-ZSR/PANI?1:5?still maintains 81% of its original value after 1000 cycles,suggesting that the composite material exhibits an excellent electrochemical stability.