Rapid microwave-assisted synthesis of graphene nanosheet/Co3O4 composite for supercapacitors

✍ Scribed by Jun Yan; Tong Wei; Wenming Qiao; Bo Shao; Qiankun Zhao; Lijun Zhang; Zhuangjun Fan

• Book ID: 103828276
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 547 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.06.081

✦ Synopsis

Graphene nanosheet (GNS)/Co 3 O 4 composite has been rapidly synthesized by microwave-assisted method. Field emission scanning electron microscopy and transmission electron microscopy observation reveals the homogeneous distribution of Co 3 O 4 nanoparticles (3-5 nm in size) on graphene sheets. Electrochemical properties are characterized by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 243.2 F g -1 has been obtained at a scan rate of 10 mV s -1 in 6 M KOH aqueous solution for GNS/Co 3 O 4 composite. Furthermore, the composite exhibits excellent long cycle life along with ∼95.6% specific capacitance retained after 2000 cycle tests.