摘要
Significant enhancement in supercapacitor performance has been achieved via a new RuO 2 nanocomposite materials prepared by direct ruthenium sputtering on arrayed multi-walled carbon nanotubes supported by Ti-buffered Si wafer. XPS, HRTEM and SAED analyses reveal that as-prepared nanoparticles have a crystalline Ru metal core with RuO 2 oxide coating. The nanocomposites convert to RuO 2 -CN x NTs with subsequent electrochemical cycling. At present, well-dispersed and strongly adhered RuO 2 NPs have been densely populated on CN x NTs to obtain the overall specific capacitance (1380 F/g-RuO 2 ), charging-discharging rate (up to 600 mV/s) and operation stability (5000 cycles). Thus, RuO 2 -CN x NTs nanocomposites would make a promising candidate for use in next-generation high efficiency miniaturized supercapacitors directly fabricated on Si substrate. © 2006 Elsevier B.V. All rights reserved.