Preparation and electrochemical capacitance of cobalt oxide (Co3O4) nanotubes as supercapacitor material

✍ Scribed by Juan Xu; Lan Gao; Jianyu Cao; Wenchang Wang; Zhidong Chen

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 691 KB
• Volume: 56
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.09.092

✦ Synopsis

Cobalt oxide (Co 3 O 4 ) nanotubes have been successfully synthesized by chemically depositing cobalt hydroxide in anodic aluminum oxide (AAO) templates and thermally annealing at 500 • C. The synthesized nanotubes have been characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The electrochemical capacitance behavior of the Co 3 O 4 nanotubes electrode was investigated by cyclic voltammetry, galvanostatic charge-discharge studies and electrochemical impedance spectroscopy in 6 mol L -1 KOH solution. The electrochemical data demonstrate that the Co 3 O 4 nanotubes display good capacitive behavior with a specific capacitance of 574 F g -1 at a current density of 0.1 A g -1 and a good specific capacitance retention of ca. 95% after 1000 continuous charge-discharge cycles, indicating that the Co 3 O 4 nanotubes can be promising electroactive materials for supercapacitor.

Published by Elsevier Ltd.