Effect of annealing temperature on electrochemical characteristics of ruthenium oxide/multi-walled carbon nanotube composites

✍ Scribed by Min-Kang Seo; Abdelghani Saouab; Soo-Jin Park

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 624 KB
• Volume: 167
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2010.01.028

✦ Synopsis

The preparation and characterization of high-surface-area ruthenium oxide (RuO 2 )/multi-walled carbon nanotubes (MWCNTs) composite electrodes for use in supercapacitors is reported in this work. The RuO 2 /MWCNTs composites were prepared by the polyol process of RuO 2 into MWCNTs and by Ru annealing in air before mixed with MWCNTs. The chemically oxidized and annealed Ru nanoparticles contribute a pseudocapacitance to the electrodes and dramatically improve the energy storage characteristics of the MWCNTs. These composites annealed at 200 • C demonstrate specific capacitances in excess of 130 F/g in comparison to 80 F/g for pristine MWCNTs. The annealing temperature is found to play an important role, as it affects the electrochemical performance of annealed RuO 2 /MWCNTs composites critically due to its influence on the diffusion of protons into the structure.