▎ 摘　　要

The multilayer dehydrated reduced graphenes oxide (DRGO) were prepared by a simple and fast treatment of graphene oxide(GO) with sulfuric acid and were used as electrode materials for supercapacitor. A reduction process was devised through a two-step reduction of graphene oxide: first in aqueous sulfuric acid and then in concentrated sulfuric acid at 70 degrees C, 30 min. The results showed that the type, amount of oxygen functionalities and newly formed sp(2) domains were different for one-pot and two-step reduction of graphene oxide. The high reduction degree DRGO electrode with less restacked layers and smaller size sp(2) domains exhibits a high specific capacitance of 321.8 F.g(-1) at a scan rate of 10 mV.s(-1) and an excellent cycling stability along with 89.7% specific capacitane retained after 1 000 cycle tests. This facile and low cost method makes the DRGO a potential candidate in applications of electrochemical capacitors.