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Soundararajan, D.,Yoon, J.K.,Kwon, J.S.,Kim, Y.I.,Kim, S.H.,Park, J.H.,Kim, Y.J.,Park, D.Y.,Kim, B.C.,Wallac, G.G.,Ko, J.M. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Closely arranged CdSe and Zn doped CdSe vertical nanorod bundles were grown directly on FTO coated glass by using electrodeposition method. Structural analysis by XRD showed the hexagonal phase without any precipitates related to Zn. FE-SEM image showed end capped vertically aligned nanorods arranged closely. From the UV-vis transmittance spectra, band gap energy was found to vary between 1.94 and 1.98 eV due to the incorporation of Zn. Solar cell parameters were obtained by assembling photoelectrochemical cells using CdSe and CdSe:Zn photoanodes, Pt cathode and polysulfide (1M $Na_2S$ + 1M S + 1M NaOH) electrolyte. The efficiency was found to increase from 0.16 to 0.22 upon Zn doping. Electrochemical impedance spectra (EIS) indicate that the charge-transfer resistance on the FTO/CdSe/polysulfide interface was greater than on FTO/CdSe:Zn/polysulfide. Cyclic voltammetry results also indicate that the FTO/CdSe:Zn/polysulfide showed higher activity towards polysulfide redox reaction than that of FTO/CdSe/polysulfide.
Pt–Ni alloy nanoparticles supported on CNF as catalyst for direct ethanol fuel cells
D. Soundararajan,J.H. Park,K.H. Kim,고장면 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Carbon nanofiber (CNF) network supported Pt and PteNi alloy nano particle catalysts were prepared by electrochemical deposition at different deposition cycles. Structure, composition and surface morphology of the Pt/CNF and PteNi/CNF were analyzed using X-ray diffraction, Energy dispersive X-ray spectroscopy and field emission scanning electron microscopy. Structural analysis by XRD revealed a face centered cubic crystal structure for Pt and its alloy. SEM images have shown that the PteNi nanoparticles distributed evenly on the CNF network. The electrocatalytic activity of the Pt/CNF and PteNi/CNF electrodes was verified using an electrochemical linear voltammetrty (ELV), cyclic voltammetry (ECV) and electrochemical impedance spectroscopy (EIS) in an alkaline solution containing 1 M C2H5OH þ 1 M KOH. The results show increased catalytic activity with enhancement of the PteNi alloy formation.
D. Soundararajan,J. K. Yoon,J. S. Kwon,Y. I. Kim,김상헌,박정호,Y. J. Kim,D.-Y. Park,B. C. Kim,G. G. Wallace,고장면 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Closely arranged CdSe and Zn doped CdSe vertical nanorod bundles were grown directly on FTO coated glass by using electrodeposition method. Structural analysis by XRD showed the hexagonal phase without any precipitates related to Zn. FE-SEM image showed end capped vertically aligned nanorods arranged closely. From the UV-vis transmittance spectra, band gap energy was found to vary between 1.94 and 1.98 eV due to the incorporation of Zn. Solar cell parameters were obtained by assembling photoelectrochemical cells using CdSe and CdSe:Zn photoanodes, Pt cathode and polysulfide (1M Na2S + 1M S + 1M NaOH) electrolyte. The efficiency was found to increase from 0.16 to 0.22 upon Zn doping. Electrochemical impedance spectra (EIS) indicate that the charge-transfer resistance on the FTO/CdSe/polysulfide interface was greater than on FTO/CdSe:Zn/polysulfide. Cyclic voltammetry results also indicate that the FTO/CdSe:Zn/polysulfide showed higher activity towards polysulfide redox reaction than that of FTO/CdSe/polysulfide.
Synthesis of CoFe₂O₄ Magnetic Nanoparticles by Thermal Decomposition
D. Soundararajan,Ki Hyeon Kim 한국자기학회 2014 Journal of Magnetics Vol.19 No.1
The amine functionalized CoFe₂O₄ nanoparticles were prepared by thermal decomposition method at reflux temperatures 160℃ and 172℃. The obtained CoFe₂O₄ nanoparticles at 160 °C reflux temperature show aggregation free poly-dispersed nanoparticles in 4-15 nm range. In an elevated reflux temperature of 172 ℃, CoFe₂O₄ show aggregated poly-dispersed nanoparticles in the size range of 20-46 nm. The saturation magnetization value at 300 K exhibited 51 emu/g at reflux temperature of 160 °C. However, the sample synthesized at an elevated temperature of 172 °C has shown a coercive field value of 560 Oe with saturation magnetization of 68 emu/g.