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The different behaviors of PdAu/C catalysts in the electrocatalytic oxidation of propane-1,3-diol and propane-1,2-diol in alkaline solution are investigated. The PdAu/C catalysts are prepared by means of the chemical co-deposition of Pd and Au on carbon black and characterized by instrumental analysis and electrochemical analysis. In propane-1,3-diol oxidation on the PdAu/C catalysts, the oxidation...
A new electrochemical sensor based on the multiwalled carbon nanotube (MWCNT)/Li 4 Ti 5 O 12 -modified glassy carbon electrode for determination of bisphenol A (BPA) was developed by modifying the surface of a glassy carbon electrode with the prepared composite Li 4 Ti 5 O 12 /MWCNTs. The morphology and structure of the...
Reduced graphene oxide/porous Si composite was fabricated through magnesiothermic reduction of mesoporous silica and subsequent dispersing porous Si in the suspension of graphene oxide followed by reduced process. The electrochemical performance of the obtained reduced graphene oxide/porous Si composite was investigated as anode for lithium ion batteries, and it delivers a reversible capacity...
Electrical properties of the NaCuFe 2 (VO 4 ) 3 compound were studied using complex impedance spectroscopy in the frequency range 300 Hz–5 MHz and temperature range (523–673 K). Both impedance and modulus analysis exhibit the grain and grain boundary contribution to the electrical response of the sample. The temperature dependence of the bulk and grain boundary...
LiFePO 4 /C has been synthesized by polymer gel combustion method. Of aniline monomer, 0.5 and 1.0 ml were used for the different amount of gel formation. The particle sizes of LiFePO 4 /C composites designated as lithium iron phosphate (0.5) (LFP(0.5)) and LFP(1.0) were estimated as ∼400 and ∼100 nm for the powders synthesized with 0.5 and 1.0 ml of monomers, respectively...
Non-woven nanofiber mats of poly(styrene sulfonic acid- co -maleic anhydride) (PSSAMA) and poly(vinyl alcohol) (PVA) were prepared by electrospinning using water as solvent. Composite membranes were prepared by casting a poly(methyl methacrylate) (PMMA) chloroform solution over the PSSAMA/PVA nanofibrous mats. Scanning electron microscopy (SEM) showed that these composite membranes...
The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO 2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O ...
Glycerol-water mixtures have been extensively studied in the past several years. One of the most used techniques to study such mixtures is dielectric spectroscopy. Here, we use it to explore the range of low frequencies. This for two main reasons: (i) although electrode polarization, occurring at frequencies below 1 kHz, is normally considered as a geometrical non-desirable effect, a detailed study...
Presence of cations from iodide source in liquid electrolyte has strong influence on photoelectrochemical characteristics of dye-sensitized solar cells (DSSCs). The present work shows the effect of different cations in liquid and silica-loaded gel electrolyte on the photovoltaic properties of DSSCs. Zeta potential measurements have been carried out to probe into the adsorption behavior of ions. It...
Olivine-structured LiMnPO 4 -MWCNT cathode materials are fabricated via vapor phase hydrolysis without calcination process and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption isotherm analysis, galvanostatic charging-discharging test, and electrochemical impedance spectroscopy (EIS). All XRD results show LiMnPO 4...
Ultra-thin orthorhombic β-WO 3 nanoflakes were prepared by two-step sol-gel-exfoliation method and sintered at 550 and 650 °C, respectively. Their morphology and electrical properties were investigated by the following material characterisation techniques: energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), current sensing force spectroscopy atomic force...
A novel carbon-sulfur composite, mesoporous carbon-sulfur, was developed as cathode of lithium/sulfur battery. The mesoporous carbon was prepared with sucrose as carbon precursor and calcium carbonate nanoparticles as pore producer. The sulfur was encapsulated in the mesoporous carbon via a simple chemical deposition strategy and a subsequent low-temperature thermal treatment process. The morphology...
The analysis of ionic mobility of Ag + ions in the nano-composite material is performed. The material is space charge polarized initially by applying a dc field ~0.5 V. The depolarization potential is recorded at various isothermal conditions in the temperature range of 300–535 K. By considering open circuit condition, drift and trapped ionic mobility are analyzed and the results...
The chemical generation of superoxide ion (O 2•− ) by dissolving potassium superoxide was investigated. The chemically generated O 2•− was then used to study the long-term stability of O 2•− in dimethyl sulfoxide (DMSO) containing ionic liquids (ILs) and determine the rate constants based on pseudo 1st- and 2nd-order reactions between...
In order to avoid the difficulties and high costs associated with salt synthesis as well as to improve the reliable performances of lithium-ion batteries (LIBs), lithium difluoro(sulfato)borate (LiBF 2 SO 4 ) was investigated as a novel functional additive salt for lithium hexafluorophosphate (LiPF 6 )-ethylene carbonate/dimethyl carbonate electrolyte. It...
Cathode materials Li[Ni x Li (1/3−2 x /3) Mn (2/3− x /3) ]O 2 with different content of Ni ( x = 1/4, 1/3) were synthesized using co-precipitation reaction. Power X-ray diffraction measurement confirmed that the obtained Li[Ni x ...
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