a b s t r a c t The preparation and characterization of high-surface-area ruthenium oxide (RuO2)/multi-walled carbon nanotubes (MWCNTs) composite electrodes for use in supercapacitors is reported in this work. The RuO2/MWCNTs composites were prepared by the polyol process of RuO2 intoMWCNTsand by Ru annealing in air before mixed with MWCNTs. The chemically oxidized and annealed Ru nanoparti…