Preparation And Performance Of Supercapacitor Electrodes

Supercapacitors?also called electrochemical capacitors?,which generally represent one type of energy storage device,are attracting much attention currently because of their high power density?2⁵ Kw/kg?,fast charge-discharge properties,long lifecycle,wide working temperature?-50⁺75 ??and their ability to function as a bridge for the power/energy gap between traditional dielectric capacitors and batteries/fuel cells.Meanwhile,with the development of nanotechnology,much more new materials come out,such as grapheme,polyaniline and so on,which solved a lot of problems that diminish the properties of supercapacitors.So supercapacitors have a faster develpnment,especially in power supply,changing pile and consumer entertainment electronic equipment power supply.Hence,we do some research on the nanometer material of TiO₂ nanotube,graphene,polyaniline nanowires,alumina,building two supercapacitors and get some research productions:1.Supercapacitor of PANI nanowire/TiO₂ nanotube arraysFirst,we report a facile process for the design and fabrication of PANI nanowire/TiO₂ nanotube arrays.Conventional anodization and an electro-polymerization process were used to form TiO₂ nanotubes and PANI nanowires,respectively.Second,we find the intricate cooperation of the two materials enables thesupercapacitor to work in a widened 1.2V potential window.The specific capacitance of these electrodesis around 897.35 Fg^-1 at a current density of 0.21 Ag^-1 in 0.05 M H2SO4.The modified electrodes also show high cycling stability and maintain 86.2% of the initial capacity after 1500 cycles.2.Supercapacitor of Na-ionFirst,we get the graphene by DC Arc Plasma JetCVD,and get alumina nanotube by anodization method.And then we fabricate a supercapacitors of Na-ion,setting the graphene as anode electrode,the alumina nanotube as cathode,Nacl?6 mol/L?as the electrolyte.Finally,we do some research on the supercapacitor,and finding when we give the supercapacitors a 3 Voltage of 5 minutes,it can make 8 red LED?light emitting diodes?to light almost 4 h.So we conclude that it is a good capacitor which can contain a great power.Besides,it aslo has a good lifecycle.These good properties will make it very popular in power in future.