α-Fe2O3 nanotubes-reduced graphene oxide composites as synergistic electrochemical capacitor materials

• Main Authors: Lee, K. K., Tan, H. R., Loh, K. P., Chin, W. S., Deng, Suzi, Fan, Hai Ming, Mhaisalkar, Subodh Gautam, Tok, Eng Soon, Sow, Chorng Haur
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2013
• Online Access: https://hdl.handle.net/10356/97476; http://hdl.handle.net/10220/10736
• Institution: Nanyang Technological University

We present a facile approach for the fabrication of a nanocomposite comprising α-Fe2O3 nanotubes (NTs) anchored on reduced graphene oxide (rGO) for electrochemical capacitors (ECs). The hollow tubular structure of the α-Fe2O3 NTs presents a high surface area for reaction, while the incorporation of rGO provides an efficient two-dimensional conductive pathway to allow fast, reversible redox reaction. As a result, the nanocomposite materials exhibit a specific capacitance which is remarkably higher ([similar]7 times) than α-Fe2O3 NTs alone. In addition, the nanocomposites show excellent cycling life and large negative potential window. These findings suggest that such nanocomposites are a promising candidate as negative electrodes in asymmetrical capacitors with neutral electrolytes.