MODIFICATION OF GRAPHENE OXIDE AND PREPARATION OF RUO2 NANOCOMPOSITES
KYEONG-WON PARK *
Department of Chemistry, Faculty of General Education, Gyeongsang National University, Jinju 52828, Republic of Korea.
*Author to whom correspondence should be addressed.
Abstract
Graphene-oxide (G) was prepared by the Hummers’ method. A G-COOH layer was synthesised using chloroacetic acid and G. To fabricate carboxylated graphene-RuO2 (G-COORu) nano-composites, RuO2 nano‑particles were grown on graphene layers using a one-step thermal method, -COOH(G-COOH), and RuCl3. All materials were characterised using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, 13C-nuclear magnetic resonance as well as X-ray photoelectron, Fourier-transform infrared spectroscopy, and Raman. The electrochemical characteristics of the G-COORu supercapacitors were analysed using electrochemical impedance spectroscopy, cyclic voltammetry, constant current charge–discharge tests, and Nyquist impedance plots. The supercapacitors exhibit a specific capacitance of ~125 F g-1 at 100 mA cm-2 within the potential range of 0–1.0 V. The method used here provides a simple approach for the deposition of RuO2 nano‑particles on graphene layers and can be widened to the fabrication of other classes of hybrids based on G layers for specific technical applications.
Keywords: Graphene oxide, nano composite, ruthenium oxide, supercapacitor, XRD, XPS