Preparation Of Hierarchical Porous Carbon And Its Capacitance Characteristics

Developing and utilizing energy resources in a rational way has become a critical issue for the world. Comparing to the non-renewable resources like petroleum and coal, renewable resources such as wind and solar energy have gained much more popularity. As a new type of energy storage device, supercapacitor has drawn great attention because of its high performance and environmental protection characteristic.Porous carbon is one of the most ideal materials for supercapacitor. Hierarchical porous carbon is one kind of porous carbon with a special structure. It presents an excellent high-rate performance when applied to supercapacitor. Researches about the synthesis of Hierarchical porous carbon have been done in recent years. Among all the reported synthesis schemes, only few of them have the advantage of controlling the structures of products. For this reason, researches about optimization of the structure and the capacitance characteristic of hierarchical porous carbon have rarely been done.Here we present a synthesis scheme which could control the structure of hierarchical porous carbon during the preparation process. Based on this scheme, we discussed the relationship between the structure and the capacitance characteristic.The results showed that the scheme successfully controlled the structures of the products. By optimizing the experiment condition, best structure and finest capacitance characteristic of hierarchical porous carbon can be obtained. The product showed an excellent high-rate performance and the specific capacitance reached 170F/g (in 6M KOH aqueous solution)at the scan rate of 5mv/s during cyclic voltammetry test. When the scan rate increased to 200mv/s, the retention of specific capacitance was more than 90%.