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Adinaveen Thambidurai,John Kennedy Lourdusamy,Judith Vijaya John,Sekaran Ganesan 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
We compared the relationship of the behavior and performance of sugarcane baggase and rice straw assupercapacitor electrodes. X-ray diffraction revealed the evolution of crystallites of carbon and silica during activation athigher temperature. The morphology of the carbon samples was determined by SEM. The surface area, pore volume,and pore size distribution of carbon composites were measured. The electrochemical responses were studied by usingcyclic voltammetry experiment at 25 oC in a three-electrode configuration. The specific capacitance of the sugarcanebagasse carbon electrodes was in the range 92-340 F/g, whereas for rice straw, it was found to be 56-112 F/g at scanrates of 2-3 mV/s. The sugarcane bagasse carbon exhibited better performance than rice straw carbon using H2SO4 asthe electrolyte. However, the results clearly show that lignocellulosic wastes possess a new biomass source of carbonaceousmaterials for high-performance supercapacitors.
T. Adinaveen,L. John Kennedy,J. Judith Vijaya,G. Sekaran 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Activated carbon composite was prepared from sugarcane bagasse. The X-ray diffraction revealed the evolution of crystallites of carbon and silica during activation at higher temperature. FTIR spectrum shows the presence of functional groups and silica in the carbon composite. The morphology of the carbon sample was determined by SEM. The surface area, pore volume and pore size distribution of carbon composites were measured. The dc conductivity was determined and conductivity at room temperature was found to increase from 10.22 x10-3 to 25.131 x 10-3 S cm-1. The samples show good electrochemical property and the specific capacitance in the range of 92–340 F g-1.
A. Manikandan,J. Judith Vijaya,J. Arul Mary,L. John Kennedy,A. Dinesh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Iron oxide (Fe3O4) nanoparticles were synthesized by a facile microwave combustion method. X-ray diffraction and energy dispersive X-ray spectroscopy results showed that the as-prepared product was pure Fe3O4 without any impurity. The mechanism for the formation of Fe3O4 by microwave combustion method is also discussed. Microwave combustion produced sufficient energy for the formation of Fe3O4, because of its homogeneous distribution within the raw materials. This results in the formation of nanoparticles, early phase formation and different morphologies within few minutes. Magnetic analysis revealed that the Fe3O4 nanoparticles had ferromagnetic behavior at room temperature with saturation magnetization of 66.12 emu/g.
Eluvathingal Devassy Sherly,John Judith Vijaya,Lourdusamy John Kennedy,Arunachalam Meenakshisundaram,Melcureraj Lavanya 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
ZnO nanoparticles were coupled with CuO, NiO, ZrO2 and CeO2 in 2 : 1 molar ratio by a microwave assisted one pot solution combustion synthesis. Structural, morphological and optical properties of ZnO and coupled oxides were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), UV-Vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), Fourier transform infrared (FTIR) spectroscopy and Brunauer- Emmett-Teller (BET) surface area analysis. XRD data revealed the presence of two phases in the coupled oxides. Photocatalytic activity of pure ZnO and ZnO coupled oxides was compared for the degradation of 2,4-dichlorophenol (2,4- DCP) under near UV light (365 nm) irradiation and the rate constant (k) values were calculated from the kinetic studies. The coupled oxide, Zn2Ce with ZnO and CeO2 in 2 : 1 molar ratio showed maximum degradation efficiency due to the efficient interparticle electron transfer between ZnO and CeO2.