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- 저자 : Nesaraj, (검색결과 6 건)
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A. Samson Nesaraj 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
Recently partially strontium substituted lanthanum ferrites, La1-xSrxFeO3-δ have been proposed as suitable alternative cathodes for intermediate temperature solid oxide fuel cells (ITSOFCs). In this study, La deficient - La0.65Sr0.30FeO3-δ (LSF) perovskite oxide material was synthesized by a simple wet chemical route and systematically characterized by XRD, TGA-DTA, FTIR, particle size analysis and SEM. The sintering properties of the LSF circular components were studied and are reported. The electrical properties of the LSF specimens were studied by a four probe DC technique in air. From the electrical characterization studies, it was found that the conductivity values of the LSF specimens increased with an increase in temperature and reached a maximum value of 153.41 Scm-1 at 769 K. Hence, this new type of material may be considered as a suitable alternative candidate cathode material for ITSOFC application.
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Srikesh, G.,Nesaraj, A. Samson The Korean Electrochemical Society 2015 Journal of electrochemical science and technology Vol.6 No.1
Transition metal oxide nanocrystalline materials are playing major role in energy storage application in this scenario. Nickel oxide is one of the best antiferromagnetic materials which is used as electrodes in energy storage devices such as, fuel cells, batteries, electrochemical capacitors, etc. In this research work, nickel oxide nanoparticles were synthesized by combustion route in presence of organic fuels such as, glycine, glucose and and urea. The prepared nickel oxide nanoparticles were calcined at 600℃ for 3 h to get phase pure materials. The calcined nanoparticles were preliminarily characterized by XRD, particle size analysis, SEM and EDAX. To prepare nickel oxide electrode materials for application in supercapacitors, the calcined NiO nanoparticles were mixed with di-methyl-acetamide and few drops of nafion solution for 12 to 16 h. The above slurry was coated in the graphite sheet and dried at 50℃ for 2 to 4 h in a hot air oven to remove organic solvent. The dried sample was subjected to electrochemical studies, such as cyclic voltammetry, AC impedance analysis and chrono-coulometry studies in KOH electrolyte medium. From the above studies, it was found that nickel oxide nanoparticles prepared by combustion synthesis using glucose as a fuel exhibited resulted in low particle diameter (42.23 nm). All the nickel oxide electrodes have shown better good capacitance values suitable for electrochemical capacitor applications.
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Thamilselvan, Annadurai,Nesaraj, A Samson,Noel, Michael,James, E.J. The Korean Electrochemical Society 2015 Journal of electrochemical science and technology Vol.6 No.4
Capacitive deionization (CDI) process is a novel approach for desalination of an aqueous salt solution. In the present study, an activated carbon cloth (ACC) is proposed as effective electrode material. Initially the carbon cloth was activated in 1 M and 8 M HNO<sub>3</sub> for 9 hours at room temperature. The untreated and chemically activated carbon cloth (ACC) electrode materials were subjected to BET surface area measurements in order to get information about their specific surface area, average pore size, total pore volume and micropore area. The above materials were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) also. The electrochemical studies for the electrodes were done using cyclic voltammetry (CV) in 0.1 M Na<sub>2</sub>SO<sub>4</sub> medium. From the studies, it was found that resistivity of the activated carbon cloth electrodes (treated in 1 M and 8 M HNO<sub>3</sub>) was decreased significantly by the chemical oxidation in nitric acid at room temperature and its capacitance was found to be 90 F/g (1 M HNO<sub>3</sub>) and 154 F/g (8 M HNO<sub>3</sub>) respectively in 0.1 M Na<sub>2</sub>SO<sub>4</sub> solution. The capacitive deionization behavior of a single cell CDI with activated carbon cloth electrodes was also studied and reported in this work.
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Solvothermal synthesis and characterization of silver nanoparticles
Guptha, K. Venkateswara,Nesaraj, A. Samson Techno-Press 2014 Advances in nano research Vol.2 No.3
Among the various nanoparticles reported for commercial applications, considerable interest has been generated by the use of silver nanoparticles. Owning to extremely small size, silver nanoparticles exhibit enhanced properties when compared with the bulk material. In this research work, silver nanoparticles were prepared by the reduction of silver salt with a reducing agent by a solvothermal method using different solvent mediums such as ethanol, hexane, toluene and acetone with water. The prepared silver nanoparticles were characterized systematically by X-ray diffraction (XRD), particle size analysis and scanning electron microscope (SEM). The results revealed the formation of pure silver phase and nano-sized particles. Among the different solvent mediums used, the silver nanoparticles prepared by hexane and water as solvent mixture resulted in very low particle size.
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Priya, S. Dharani,Selvakumar, A. Immanuel,Nesaraj, A. Samson The Korean Electrochemical Society 2020 Journal of electrochemical science and technology Vol.11 No.2
The article provides information on ceramic / nanostructured materials which are suitable for solid oxide fuel cells (SOFCs) working between 500 to 1000℃. However, low temperature solid oxide fuel cells LTSOFCs working at less than 600℃ are being developed now-a-days with suitable new materials and are globally explored as the "future energy conversion devices". The LTSOFCs device has emerged as a novel technology especially for stationary power generation, portable and transportation applications. Operating SOFC at low temperature (i.e. < 600℃) with higher efficiency is a bigger challenge for the scientific community since in low temperature regions, the efficiency might be less and the components might have exhibited lower catalytic activity which may result in poor cell performance. Employing new and novel nanoscale ceramic materials and composites may improve the SOFC performance at low temperature ranges is most focused now-a-days. This review article focuses on the overview of various ceramic and nanostructured materials and components applicable for SOFC devices reported by different researchers across the globe. More importance is given for the nanostructured materials and components developed for LTSOFC technology so far.
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J. Jasmine Ketzial,A. Samson Nesaraj 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Nano-crystalline particles of CeO2 have been synthesized by a low temperature chemical precipitation method. The precursor materials used in this research were cerium nitrate hexa hydrate (as a basic material), sodium hydroxide (as a precipitator material) and poly ethylene glycol or poly vinyl pyrollidone (as a surfactant material). In a typical experiment, an aqueous solution of the starting material containing Ce3+ ions was poured into an alkaline solution with the required percentage of surfactant. The resultant yellow colored precipitate [Ce(OH)4] was washed with water / ethyl alcohol and then heat treated at 600 oC for 2 hours. The prepared CeO2 nanoparticles were characterized by TG-DTA, XRD, FTIR, particle size analysis and SEM. From the results obtained, the effect of surfactants on the particle characteristics of CeO2 is correlated and discussed.
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