Advanced Materials: TechConnect Briefs 2015Advanced Materials TechConnect Briefs 2015

Graphene Chapter 4

Electrochemical and textural characterization of RuO2-SnO2-graphene under co-precipitation / hydrothermal conditions

X. Leng, J.P. Zou, X. Xiong, H.W. He
Central South University, China

pp. 176 - 179

Keywords: graphene, composites, pseudocapacitance

In this report, ternary composite of RuO2-SnO2-graphene with different input ratio of RuCl3, SnCl2 and graphene oxides were prepared by using co-precipitation / hydrothermal approaches followed by thermal treatment. SEM, TEM, and XRD were used to characterize the morphology and microstructure change of as-prepared RuO2-SnO2-graphene composites. The electrochemical performance was carried out on a CHI 660B work station(Chenhua Corp.) via Chronopotentiometry, cyclic voltammetry and AC impedence methods. From the results microstructure characterization of electrochemical perfomance, we could see atomic-scale mixing may intrigue an enhancement in the electrochemical active surface and promote the utilization of oxyruthenium species. And a higher degree of atomic-scale mixing means more obvious synergism since inter-diffusion of Ru and Sn atoms can occur only at the contact interface between RuO2 and SnO2 nanoparticles. In summary, samples with hydrothermal treatment exhibit higher crystallinity, lower ESR and specific capacitance of 154 F/g ~ 200F/g at 1 A/g. Samples without hydrothermal treatment show negative shift in RuO2 (110) diffraction peak and relative higher specific capacitance of 250 F/g ~ 436 F/g at 1 A/g.