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Layer by layer approach to enhance capacitance using metal sulfides for supercapacitor applications
Subramanian, Archana,Punnoose, Dinah,Raman, Vivekanandan,Gopi, Chandu V.V. Muralee,Rao, Sunkara Srinivasa,Khan, Muhammad Adil,Kim, Hee-Je Elsevier 2018 Materials letters Vol.231 No.-
<P><B>Abstract</B></P> <P>Layer-by-layer approach for NiS, CoS and PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) is being fabricated. Metal sulfides have always been chosen for their remarkable electrochemical characteristics and wide beneficial domains, such as electrochemical energy conversion and storage. This work presents the preparation of cost-effective metal sulfides (NiS, NiS/CoS, NiS/CoS/PEDOT:PSS) developed on nickel foam sheets for supercapacitor (SC) applications. The assembled NiS/CoS/PEDOT:PSS array SC device exhibits an utmost energy density of 30.3 W h kg<SUP>−1</SUP> and specific capacitance of 353 F g<SUP>−1</SUP>. All wet processing methods of fabrication accompanied with superior performance characteristics make these SCs very attractive for the next generation flexible energy storage systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiS/CoS/PEDOT:PSS on nickel foam is coated by Chemical Bath Deposition method. </LI> <LI> Metal sulfides extend active area due to low electronegativity of sulfur over oxygen. </LI> <LI> PEDOT:PSS on NiS/CoS is coated to increase surface area and conductivity. </LI> <LI> NiS/CoS/PEDOT:PSS showed maximal specific capacitance of 353 F g<SUP>−1</SUP> at 15 mA cm<SUP>−2</SUP>. </LI> </UL> </P>
V. Vinod Kumar,S. Nithya,Aswin Shyam,N. Sai Subramanian,J. Tennis Anthuvan,Savarimuthu Philip Anthony 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
Silver nanoparticles (AgNPs) with spherical and prism morphologies were formed at room temperature depend on the amino acid attached with phenolic unit. Absorption studies showed 410-420 nm surface plasmon resonance absorption for spherical nanoparticles whereas prism morphology showed three absorption peaks (382, 452 and 523 nm). The formation of spherical and prism morphology was confirmed by scanning and high resolution transmission electron microscopy. Antibacterial studies of both the morphologies did not show any significant differences in the inhibition of bacterial growth.
B. Subramanian,V. Swaminathan,M. Jayachandran 한국물리학회 2011 Current Applied Physics Vol.11 No.1
The materials properties of nanostructured Aluminum nitride (AlN) film were studied. AlN films of about 2 μm thick were deposited on Si (100) and glass substrates by means of direct current reactive magnetron sputtering in an Ar + N_2 gas mixture. A hexagonal wurtzite structure with a predominant peak was observed along the (002) plane from XRD analysis. Photoelectron peaks from Al, N, O, C and Ar are detected on the surface of the film. Microstructure and topography were analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The images showed the presence of continuously covered pebble like spherical grains on the surface. AlN films are transparent in the visible region with an average transmittance of 60%. The optical absorption studies give direct band gap equal to 5.2 eV.
Sivakumar Subramanian,A. S. Sekhar,B. V. S. S. S. Prasad 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
Leakage characteristics, influenced by centrifugal and thermal radial growth are determined computationally for a generic rotating labyrinthseal used in the gas turbine secondary air system. Three seal locations, namely, R25, R50 and R75 are represented by means ofvarying the rotor radius mimicking different radial positions of the seal from the shaft axis. The combined influence of seal location andits radial (Centrifugal and thermal) growth on the leakage performance is investigated for a wide-ranging speeds from 1000 to 3000 rad/s,temperatures ranging from 200 to 450 oC and pressure ratios varying from 1.1 to 2.5, for a chosen initial clearance of 500 micron. Acomparison of the effect of rotation and temperature gradient among different rotors shows that the radial growth and leakage flow ratessignificantly vary with the increasing radius.
B. Subramanian,V. Swaminathan,M. Jayachandran 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.6
Thin films of Zirconium Nitride (ZrN) were deposited by DC magnetron sputtering. The structure of the films was examined by X-ray diffraction and the crystallographic parameters were refined by Rietveld analysis. The columnar micro-structure was observed via cross-sectional SEM analysis. Defect induced,first order spectra were observed from Laser Raman studies. XPS showed the presence of Zr (N,O) ZrO2phases on the surface of the film. The pitting corrosion was substantially reduced by the employment of Zr film as an interlayer. Corrosion tests revealed that ZrN films with a Zr interlayer exhibited clear passivation characteristics with considerably better corrosion resistance than the film without an interlayer.