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Karuppasamy, K.,Prasanna, K.,Ilango, P. Robert,Vikraman, Dhanasekaran,Bose, Ranjith,Alfantazi, Akram,Kim, Hyun-Seok Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-
<P><B>Abstract</B></P> <P>In the present work, a porous nano-carbon (PNC) based electrode materials were successfully derived from the natural biopolymer phytagel via a facile hydrothermal and combustion process. The carbon phase structure of the PNC electrode was confirmed using different spectroscopy, microscopy and N<SUB>2</SUB> adsorption-desorption analyses. The surface morphology investigation showed a distinct shape and size for the PNC that demonstrated its porous nature. The electrochemical performance of PNC was completely reliant on the calcination temperature (800°C) and it delivered the maximum capacitance of 122Fg<SUP>−1</SUP> at 0.25Ag<SUP>−1</SUP>. An AC impedance and cyclic voltammetry analyses proved the intrinsic electrochemical behavior by their cycling. Besides, the fabricated symmetric solid-state supercapacitor displayed an outstanding cycle durability with a stable capacitance retention of 85.8% over 8000 cycles, suggesting favorable prospects for its use as an active candidate for symmetric solid-state supercapacitor applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
P. Santhoshkumar,T. Subburaj,K. Karuppasamy,A. Kathalingam,Dhanasekaran Vikraman,박현창,김현석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
Herein, a red iron oxide @ carbon fiber (RIO@CF) composite is prepared via a simple and effective singlehydrothermal and calcination process. The physico-chemical characteristics of as-prepared electrodeactive materials are examined by X-ray photoelectron spectroscopy, high resolution field emissionscanningelectron microscopy and field emission-tunneling electron microscopy analyses. When usedas the anode material in the Li-ion battery, as-prepared RIO@CF composite have shown a specific capacityof 1138 mAh g 1 after 150 cycles with a capacity retention of 86% at a current density of 100 mA g 1. Moreover, a specific capacity of 825 mAh g 1 is achieved in the first cycle at a current density of about5000 mA g 1. Thus, when compared to the pristine nano-cube-like red iron oxide (RIO) electrode material,the RIO@CF composite electrode exhibits an outstanding cyclic stability and rate capacity. This electrochemicalenhancement facilitates effective lithium ion transport into the RIO@CF composite electrode,thus improving the electrical conductivity. In addition, the application of a homogeneous carbon fibercoating can provide effective contact between the electrode surface and the electrolyte to further benefitthe electrochemical performance.
K. Karuppasamy,K. Prasanna,P. Robert Ilango,Dhanasekaran Vikraman,Ranjith Bose,Akram Alfantazi,김현석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
In the present work, a porous nano-carbon (PNC) based electrode materials were successfully derivedfrom the natural biopolymer phytagel via a facile hydrothermal and combustion process. The carbonphase structure of the PNC electrode was confirmed using different spectroscopy, microscopy and N2adsorption-desorption analyses. The surface morphology investigation showed a distinct shape and sizefor the PNC that demonstrated its porous nature. The electrochemical performance of PNC wascompletely reliant on the calcination temperature (800 C) and it delivered the maximum capacitance of122 F g 1 at 0.25 Ag 1. An AC impedance and cyclic voltammetry analyses proved the intrinsicelectrochemical behavior by their cycling. Besides, the fabricated symmetric solid-state supercapacitordisplayed an outstanding cycle durability with a stable capacitance retention of 85.8% over 8000 cycles,suggesting favorable prospects for its use as an active candidate for symmetric solid-state supercapacitorapplications.
M. Srinivasan,P. Karuppasamy,P. Ramasamy,A. K. Barua 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.4
Numerical modelling has emerged as a powerful tool for the development andoptimization of directional solidification process for mass production of multicrystallinesilicon. A transient global heat transfer model is performed to investigate theeffect of bottom grooved furnace upon the directional solidification (DS) process ofmulti-crystalline silicon (mc-Si). The temperature distribution, von Mises stress,residual stress and dislocation density rate in multi-crystalline silicon ingots grown bymodified directional solidification method have been investigated for five growth stagesusing finite volume method at the critical Prandtl number, Pr = 0.01. This paperdiscusses bottom groove furnace instead of seed crystal DS method. It achieves anadvanced understanding of the thermal and mechanical behaviour in grown multicrystallineingot by bottom grooved directional solidification method. The von Misesstress and dislocation density were reduced while using the bottom grooved furnace. This work was carried out in the different grooves of radius 30 mm, 60 mm and 90 mmof the heat exchanger block of the DS furnace. In this paper, the results are presented for60 mm radius groove only because it has got better results compared to the othergrooves. Also, the computational results of bottom grooved DS method show betterperformance compared the conventional DS method for stress and dislocation densityin grown ingot.
Thomas Kezhia,Parol Vinay,Karuppasamy P.,Pandian Muthu Senthil,Ramsamy P.,Prabhu A.N. 한국물리학회 2022 Current Applied Physics Vol.37 No.-
In this article, effect of gamma irradiation on the structural and optical properties of 2-aminopyridinium 4- nitrophenolate 4-nitrophenol (2AP4N) has been reported. The grown crystals of 2AP4N were exposed to 60Co gamma rays with a dose of 50 kGy and 100 kGy. The radiation-induced effects were analyzed using X-ray diffraction, FT-IR, UV–visible, photoluminescence techniques. The refractive index was determined using a long arm spectrometer. The structural properties of the pristine and irradiated crystals were studied using powder XRD. The peak intensity decrease after irradiation may be attributed to the formation of point defects. The UV visible study reveals that the energy gap has decreased after irradiation and then has increased for the higher dose. The intensity variation in the PL spectra is due to colour center mechanism. The SHG efficiency of 2AP4N crystals was found to be unaffected by gamma irradiation.