Abstract
In this work, ruthenium oxide (RuO2¬) thin films were synthesized onto the surface of the vertically grown graphene nanofibers (GNFs) by cyclic voltammetric (CV) deposition, an easy and efficient solution-based method, have been investigated for potential application in electrochemical capacitors (ECs). The nanostructure of RuO2/GNF was characterized by the high-resolution transmission electron microscopy (HRTEM). From the HRTEM image, the RuO2 nanoparticles were anchored onto the GNFs. The Raman spectrum was used to examine the characteristic of the RuO2/GNF. The chemical states and characteristic of RuO2/GNF were confirmed by the X-ray photoelectron spectroscopy (XPS). The electrochemical properties were characterized by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectra (EIS). From studying the electrochemical charge storage properties of RuO2/GNF, electrochemical measurements reveal that the maximum specific capacitance of the RuO2/GNF electrodes is 53.7 mF cm-2. This is attributed to RuO2 is well-dispersed on GNFs.