119th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists Ⅰ
Room No. 303호
Time THU 10:42-:
Code ANAL1.O-44
Subject Synthesis and characterization of graphene-enfolded mesoporous TiO2 microsphere as anode material for Li secondary batteries
Authors Hasan Jamal, 이창섭*
계명대학교 화학과, Korea
Abstract In this study, graphene-bonded and enfolded mesoporous anatase TiO2 microsphere (GMTMs) composites have been synthesized without using any cross-linking reagent, by using graphene oxide (GO) and titanium glycolate microsphere (TGMs) as a precursor. Monodispersed and uniform mesoporous TiO2 microspheres with a tunable diameter were fabricated by the facile aqueous route, nano-particle microspheres are interconnected 10-20 nm in size. TGMs diameter tuned from 100 to 800 nm with consistent size and morphology by changing the amount of water. GO sheets were enfolded on TGMs by covalent bond after a subsequent refluxing. Crystallization of TiO2 and reduction of GOMTMs was dramatically marked up by hydrothermal and calcination in an Ar atmosphere. The physicochemical properties were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Surface areas were also measured by BET method. The electrochemical performance of TGMs composites as anode for Li secondary batteries were investigated by cyclic voltammetry, galvanostatic charge/discharge, and impedance spectroscopy. TGMs composite with higher surface area showed better electrochemical performance in charge capacity and cycle ability. Acknowledgements This research was financially supported by the Ministry of Education, Science Technology (MEST) and National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation (NO.2015035858)
E-mail hasanjamal13@yahoo.com