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The effect of different compositions (in weight percent) of ethylene carbonate (EC) and propylene carbonate (PC) containing iodide/triiodide redox electrolyte on the photoelectrochemical performance of N719-sensitized nanocrystalline TiO2 solar cell was studied. The cells consisted of 0.6 M 1-hexyl-2,3-dimethylimidazolium iodide, 0.1 M LiI, 0.05 M I2 and 0.5 M 4-tert-butylpyridine in different compositions...
Layered perovskite-type oxides LnSr2MnFeO7, with Ln = La, Nd, Gd, and Dy, have been synthesized by conventional solid-state reaction method. Rietveld refinement shows that all the phases were found to crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease monotonically with decreasing effective ionic radius of the lanthanide ion. The phases show...
Ionic liquid glow discharge electrolysis for nanoparticle synthesis is an emerging nanomaterials processing technology and the stability of ionic liquid when they are in contact with plasma is an important issue. This paper discusses the stability of [BMIM][BF4] after exposing this ionic liquid to glow discharge plasma and the synthesis of cubic crystalline ZnS nanoparticles by plasma electrochemical...
Composite nanofibrous electrolyte membranes (CFEM) of poly(vinylidene fluoride-hexafluoropropylene) P(VdF-HFP)-1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) and its NaSCN are electrospun as nanofibrous membranes. Scanning electron microscope (SEM) images clearly inform that electrospun CFEM and CFEM–NaSCN with average fiber diameters of 50–200 nm have interconnected multifibrous layers with...
Li-rich Mn-based Li[Li0.09Mn0.65*(0.91 − x) Ni0.35*(0.91 − x) Alx]O2 cathode materials have been prepared by traditional solid-state reaction. The lattice parameters a, c, and V have decreased, but c/a increased with the increase of Al doping. All the samples show analogy morphology of a quasi-spherical shape. Li[Li0.09Mn0.591Ni0.319]O2 sample shows a higher initial discharge...
Poly(vinylidene fluoride)-based polymer electrolytes using ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsufonyl)imide as the plasticizer were prepared by solution casting method. The effects of the solvent evaporation temperature (SET) and ionic liquid content (ILC) on the properties and structures of the polymer electrolytes were investigated by characterization of scanning electron...
A cathode material, 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2, was prepared by citric acid-assisted sol–gel method and its electrochemical performance was investigated. It delivered a charge capacity of 270 mAh g−1 and a discharge capacity of 189 mAh g−1 in the first cycle. With the increase of current density from 14 to 28 mA g−1, the discharge capacity dropped severely to 130 mA g−1. Obviously, the rate capability...
Three-dimensional (3-D) porous copper with stable pore structure is prepared by electroless plating. 3-D porous Sn–Co alloy/carbon nanotube (CNT) composite is synthesized by electrodeposition using 3-D porous copper as the substrate. The scanning electron microscope results indicate that 3-D porous Sn–Co alloy/CNT composite contains a large amount of interconnected pores with the diameter size of...
A novel phosphazene groups modified sulfur composites cathode [triphosphazene sulfide composite (PS) or nitroaniline–triphosphazene disulfide composite (NPS)] which can give good affinity with electrolytes was prepared. Their chemical structures were identified by FTIR and XRD analysis. SEM analysis showed PS and NPS had a denser and rougher surface structure than elemental sulfur, with many tiny...
A novel solid-state composite polymer electrolyte (CPE), based on a polymer, poly(ethylene oxide) (PEO), alkali metal salts, and NaY molecular sieve powders with a small amount of low molecular weight plasticizer, ethylene carbonate (EC) is investigated. (PEO)16LiClO4 polymer metal salt complexes with 5 wt% EC, and different content of NaY are prepared by the solution casting technology. The crystallization...
The Fe-substituted Li2MnO3 cathode materials were synthesized by the coprecipitation method. The effects of the different precipitants of Na2CO3 and NaOH on the structure, morphology, and electrochemical performance were investigated by X-ray diffractometry, scanning electron microscopy, dQ/dV plots, and charge–discharge tests. The results indicate that the materials prepared using both precipitants...
A series of Cr-substituted LiMn2O4 samples (LiCrxMn2-xO4, 0 ≤ x ≤ 0.3) were synthesized by a urea-assisted combustion method to enhance pseudocapacitive properties of LiMn2O4 material in aqueous electrolyte. Their structure and morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The LiCrxMn2-xO4 and activated carbon (AC) electrode were used as the cathode...
In this paper, a novel Nafion polymer-coated stannum film-modified carbon paste electrode was developed for the analysis of trace cadmium by square wave anodic stripping voltammetry. The electronic conductive material—molecular wire (diphenylacetylene)—was employed as the binder instead of traditional mineral oil for fabricating this electrode. It was found that the prepared electrode possessed excellent...
The addition of polymer to liquid electrolytes containing trifluoromethanesulfonic acid (HCF3SO3) in propylene carbonate (PC) has been found to result in an increase in conductivity of gel electrolytes. The increase in conductivity has been observed to be due to the dissociation of ion aggregates present in the electrolytes which has also been supported by Fourier transform infrared studies. The maximum...
Density function theory study on novel lithium battery cathode material, Li2FeVO4, has been analyzed using full potential linearized augmented plane wave approach. Calculations are based on two types of ground states; (1) self-interaction correction applied to Fe atom only and (2) self-interaction correction applied to both Fe and V atoms. Calculations on geometrical structure (volume optimization/force...
Investigation on the X-ray diffraction results of rare earth ions such as Eu3+ and Nd3+ doped BaSnF4 materials indicates that the doped materials show a similar pattern of BaSnF4 with the same tetragonal structure (P4/nmm). The transport properties of the materials have been investigated by impedance spectroscopy, and the results show that the conductivity values are closely related to both concentration...
Silicon/carbon nanocomposites are prepared by dispersing nano-sized silicon in mesophase pitch and a subsequent pyrolysis process. In the nanocomposites, silicon nanoparticles are homogeneously distributed in the carbon networks derived from the mesophase pitch. The silicon/carbon nanocomposite delivers a high reversible capacity of 841 mAh g−1 at the current density of 100 mA g−1 at the first cycle,...
In this study, the effect of ascorbic acid in the electrochemical behavior of copper has been investigated in 3.5 % NaCl solution using potentiodynamic polarization and electrochemical impedance spectroscopy. Current-potential curve and Nyquist diagrams were obtained in different concentrations of ascorbic acid. The surface morphology of copper after its exposure to 3.5 % NaCl solution with and without...
Polyvinyl alcohol (PVA) complexes with different compositions of ammonium acetate (AA) are prepared by solution cast technique. Polyvinyl alcohol crystallinity decreased with increasing ammonium acetate salt content. Molecular weight and density of polyvinyl alcohol complex increased with the addition of ammonium acetate salt. The ammonium acetate salt addition resulted in plasticization and hence...
A mixed potential type yttria-stabilized zirconia-based sensor using NiO sensing electrode and Pt reference electrode was fabricated, and its NO2 sensing characteristics were examined at various operating temperatures in the range of 700–950 °C. It was observed that the sensitivity to NO2 strongly depends on the operating temperature of the sensor; the sensitivity decreases with increasing operating...
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