121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-323
Subject Synthesis and characterization of mesoporous graphene-Mn3O4 nanocomposite for supercapacitor applications
Authors David Odhiambo Opar, Jihye Lee, Hyun Jung*
Department of Chemistry, Dongguk University, Korea
Abstract We successfully synthesized mesoporous graphene – manganese oxide (MG-Mn3O4) nanocomposites through self-assembly interaction process, at room temperature. Mesoporous graphene (MG) was prepared by hydrothermal treatment using graphene oxide (GO) and triblock copolymer (Pluronic, P123), followed by calcination. Manganese oxide (Mn3O4) nanoparticles were synthesized through thermal decomposition of manganese (II) acetate tetrahydrate in the presence of oleylamine and oleic acid. The obtained Mn3O4 nanoparticles have uniform cubic shape and size (5.0 ± 1.4 nm). Then, MG-Mn3O4 nanocomposite was obtained by stirring a mixture of the as-prepared MG and Mn3O4 nanoparticles, while varying the concentration of Mn3O4 suspension and subsequently calcined. Morphological and microstructural studies were carried out on the as-synthesized nanocomposites by transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and powder X-ray diffraction (XRD). Nitrogen adsorption/desorption isotherms were used to investigate the specific surface area and pore size distribution of the nanocomposites. Thermal gravimetric analysis (TGA) measurements were carried to determine the mass percentage of MG and Mn3O4 in the nanocomposite. The electrochemical properties of the nanocomposite were investigated by cyclic voltammetry (CV) and galvanostatic charge – discharge measurements. To achieve efficient electrochemical performance, the ratio of MG to initial concentration of Mn3O4 suspension in the nanocomposite was systematically varied to find the optimal condition for effective application as electrode material for supercapacitors.
E-mail davidopar@gmail.com