Supercapacitor(also called electrochemical capacitor,electric double layer capacitor)is a new device for electric energy storage.It has not only much more energy than conventional capacitors,but also much higher power density than batteries.Electrode material is one of the most important components of a supercapacitor.It is a key factor influencing the performance of supercapacitor.The research and development of electrode materials have been a hot topic in both academe and industry field in recent ye...