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The electrical conductances of very dilute solutions of the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate [emim][BF4] and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF4] in the low-permittivity solvent dichloromethane have been measured in the temperature range from 278.15 to 303.15 K at 5 K intervals. The data was analyzed assuming the possible presence of contact (CIP) and...
A novel sensitive electrochemical sensor has been developed by modification of glassy carbon electrode (GCE) with graphene (GRP), chitosan (CHIT), and bismuth oxide (Bi2O3) nanoparticles. The morphological characteristics of nanocomposite (GRP-CHIT-Bi2O3 or GCB) were studied by scanning electron microscope and atomic force microscopy. The electrochemical behavior of epinephrine at nanocomposite modified...
This paper describes the preparation and characterization of poly(vinyl alcohol) (PVA)-added ionic liquid-based ion conductors. The polymer electrolyte is incorporated with magnesium triflate [Mg(CF3SO3)2 or MgTf] as salt and 1-butyl-3-methylimidazolium bromide (BmImBr) as ionic liquid. Differential scanning calorimetry (DSC) is carried out to investigate the glass transition temperature which is...
In this study, zinc ferrite (ZnFe2O4) nanofibers were successfully fabricated by a combination of electrospinning and calcination process. Only peaks of ZnFe2O4 could be observed from X-ray diffractometry patterns, indicating that the formation of pure compound. SEM and TEM images showed the ZnFe2O4 nanofibers possessed good continuous fiber morphology with an average diameter of about 150 nm. Moreover,...
Cathode materials consisting of Sr1−xHoxCoO3−δ (SHC, x ≤ 0.3) were synthesized by solid-state reaction for intermediate temperature solid oxide fuel cell (IT-SOFC). The crystal structures, total electrical conductivity, thermogravimetric analysis (TGA), thermal expansion coefficient (TEC), area-specific resistance (ASR), and cell performance were investigated...
Polymer blend electrolytes based on poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) were prepared by using different lithium salts LiX (X = ClO4, BF4, CF3SO3, and N [CF3SO2]2) using solution casting technique. To confirm the structure and complexation of the electrolyte films, the prepared electrolytes were subjected to X-ray diffraction (XRD) and Fourier transform...
First principles calculations were used to investigate the changes in crystal-structure stability due to localization of metal species in the transition metal layer of LiNi1/3Co1/3Mn1/3O2 in a solid solution that is used as the cathode active material of a Li-ion battery. The covalency of the boundary of each localized domain was investigated between Co–O and Mn–O at the CoO2-MnO2 boundary; there...
The technique of solution aerosol thermolysis (SAT) for the production of components suitable for operation of solid oxide fuel cells (SOFC) is reviewed. Major advantages of the technique include its versatility, low cost, and control of the product stoichiometry at droplet level. Progress in understanding the major physicochemical parameters that play a role in final film morphology is emphasized.
A unique monodispersed MnCO3/graphene nanosheet composite is synthesized by a simple one-step hydrothermal method and used as anode of lithium-ion battery. X-ray diffraction patterns show the typical rhombohedral structure of MnCO3. A transmission electron micrograph reveals that MnCO3 is evenly distributed on the graphene nanosheet surface with a uniform diameter of 100 nm. Electrochemical performance...
In this work, doped poly(p-phenylene vinylene)/zeolite composites was prepared to detect the three different chemical vapors (acetone, methanol, and n-heptane) and to investigate the effects of zeolite type, chemical vapor type, and vapor concentration based on the electrical conductivity response and selectivity properties of the sensing materials. Before blending with PPV, zeolite Y (Si/Al = 5.1...
Li4Ti5O12 (LTO) was synthesized with two different cooling methods by solid-state method, namely fast cooling and air cooling. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), galvanostatic charge–discharge test, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), respectively. XRD revealed that the basic LTO structure...
A sensitive and selective electrochemical Pb2+ sensor consisting of a gold-carbon foam/chitosan/gold (Au-CFs/Chit/Au)-modified electrode was prepared. The electrode was synthesized via an oil-in-water emulsion polymerization and carbonization approach. Phenolic resins were used as a carbon source. HAuCl4 was used as a gold source and as an acidic catalyst. Melamine was used as a coordination and coupling...
We investigated the influence of pH, Pb2+, and temperature on the electrochemical dissolution of galena. The experimental results showed the following: (1) Acidic or alkaline conditions stimulate galena electrochemical dissolution. The galena electrode corrosion current density (jcorr) increased from 0.072 to 0.143 μA·cm−2 as the pH decreased from 6.0 to 2.0 (promotion efficiency of 98...
To seek a promising candidate electrolyte at elevated temperature for lithium manganese oxide (LiMn2O4)/Li cells, the electrochemical performance of 0.7 mol L−1 LiBOB (lithium bis(oxalate)borate)-SL (sulfolane)/DEC (diethyl carbonate) (1:1, in volume) electrolyte was studied at 55 °C. The Mn dissolution in electrolyte was analyzed by inductively coupled plasma (ICP) analysis. AC impedance measurement...
MnO@C composites with three-dimensional cross-linked structure were designed and fabricated through hydrothermal treatment. Cation exchange resin was used as the precursor to create a three-dimensional cross-linked porous carbon structure, which was evenly decorated by nanosized MnO particles. When compared with pristine MnO, those MnO@C composites showed much better stability during charge-discharge...
Ni doped perovskite oxides La0.6Sr0.4Co1-xNixO3 (x = 0, 0.05, 0.1) have been synthesized by a dry gel combustion method using citric acid and EDTA (ethylene diamine tetraacetic acid) as complex agent. The Li-O2 batteries on the basis of the La0.6Sr0.4Co1-xNixO3 perovskite nanoparticles and non-aqueous electrolytes were also fabricated...
A novel electrochemical sensor for the selective determination of mebeverine hydrochloride (MEB) in drug substance, products, and human plasma was introduced. The prepared nanoparticle sensor was based on a carbon paste electrode chemically modified with silica and gold nanoparticles. The surface morphology of the modified electrode was characterized by scanning electron microscope. Several parameters...
Ultrafine-structure La0.65Sr0.35MnO3 (LSM) powders synthesized by self-propagating combustion method have been used to fabricate sensing electrodes (SEs) for NO2 mixed-potential sensors based on yttria-stabilized zirconia (YSZ). This type of sensor was found to provide better NO2 sensitivity at 500 °C than sensors with LSM powders synthesized by traditional solid-state methods. The response values...
In the current research, iron oxide nanoparticles were functionalized by acrylic acid polymerization. The Fe3O4/PAA core-shell nanoparticles were utilized for the modification of cation exchange membranes. Ion exchange membranes were prepared by solution casting technique using cation exchange resin powder as functional group agent and tetrahydrofuran as solvent. FTIR analysis proved the formation...
FePt nanoparticles were synthesized by polyol process with chloride salts, and the equiatomic composition was surface modified with prussian blue (PB). From the magnetic studies, the fraction of PB present in the surface-modified fcc-FePt was found to be 18 %. The FePt nanoparticles with an average particle size of 5 nm forms cluster like morphology, which were embedded in the PB matrix. The electrocatalytic...
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