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A layered Aurivillius-type solid electrolyte, formulated as BiNi0.20 − xAlxVOX (Bi4Ni 0.2 − x(II) Al x(III) V1.8O10.7 + (x/2); 0 ≤ x ≤ 0.20) was synthesized by the standard solid-state reaction. The influence of Al substitution for Ni on the relationship between the phase stability and electrical performance in the parent bismuth vanadate was investigated by combining results obtained from...
RGO/TiO2NTs/Ti electrodes with high surface area and good capacitive characteristics were prepared by simple electrochemical reduction of graphene oxide (GO) onto the previously formed TiO2 nanotubes. Microstructure studies show that reduced graphene oxide (RGO) having high surface area has been deposited onto the TiO2NT arrays. The electrochemical capacitive behaviors of the obtained electrodes were...
Polymers have been studied for drug delivery system. To use polymer, polyvinyl alcohol (PVA) for drug delivery, one has to understand the interaction between PVA and the drug to be used. The drug, amino acids are essentials for human health. An attempt is made to study the interaction between PVA and Proline, one of the amino acids. Polymer electrolyte based on PVA complexes with different concentrations...
We have reported a new reduced graphene oxide–bismuth oxide composite that can be used as a supercapacitor electrode. Bi2O3 was synthesized from bismuth nitrate pentahydrate and oxalic acid as a precipitating agent using a hydrothermal process in an aqueous graphene oxide suspension. Instead of mixing graphene oxide with bismuth oxide, we have developed a bismuth oxalate precipitation between the...
Nano-TiO2 is selected as inorganic filler to fabricate the reduced crystalline composite polymer membrane. The porous polymer matrix employed in this study was poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membrane synthesized via non-solvent evaporate method and the electrolyte solution uptake was carried out in the glove box to avoid the moisture contamination. The effect of nano-TiO...
This research tried to estimate diffusion coefficient for lithium ions through the surface of the spinel LiNi0.5Mn1.5O4 by spin-polarized total energy calculation. In addition, calculated result by this ab initio model was compared with a semi-empirical model. Both of these models predicted diffusion coefficient for lithium ions at the interface of the spinel LiNi0.5Mn1.5O4/electrolyte as 10−8 cm2...
A solid polymer electrolyte is fabricated using polyethylene oxide (PEO), lithium bis(Trifluromethanesulfonyl)imide (LiTFSI), and montmorillonite (MMT), with the aim of improving lithium ion conductivity, and the resulting solid polymer electrolyte is used for all solid-state lithium/sulfur batteries. The effect of temperature and nanoclay content on the conductivity of the resulting solid polymer...
The LiFe0.98M0.02PO4/C (M = Ni, V, and Mn) composite materials were synthesized by solid state reaction using Fe2O3 as a mixed iron source and citric acid as a carbon source. The crystal structure features and particle morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical properties of samples were characterized by charge-discharge testing,...
A facile electrostatic co-precipitation route has been employed to prepare f-SWCNT/Co3O4 nano-composite. The prepared samples have been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and BET. Application of the prepared samples has been evaluated as supercapacitor material in 6 M KOH...
A few compositions in the system Ce0.85La0.15 − xSrxO{2 − (0.075 + x / 2)} have been prepared using citrate-nitrate method. More than 95 % of theoretical density has been obtained by sintering at 1,350 °C for 4 h in air. Solid solution forms in all the compositions. Surface morphology has been studied by scanning electron microscope (SEM). Morphology of powder has been studied by bright field transmission...
A new compound from the tellurate family was synthesized under a slow evaporation conditions. A crystalline sample of Cs2(HAsO4)0.32(SO4)0.68·Te(OH)6 (CsAsSTe) was calorimetric and spectroscopically characterized. The infrared and Raman spectra of this new compound recorded at room temperature, in the frequency range 500–4,500 and 50–1,500 cm−1, respectively, confirm the presence and the independence...
The effect of isovalent V substitution for Nb in Li5La3Nb2O12 on the electrical conductivity properties of the garnet-type structure was investigated by various physical methods, including powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and 7Li nuclear magnetic resonance (NMR) spectroscopy. Garnet-type metal oxides of the nominal chemical formula, Li5La3Nb2−xVxO12 (x = 0 – 0...
An uncomplicated method for the detection of organophosphorous pesticide characterized by a thione moiety (P = S) was developed, and chlorpyrifos was used as an example. It was based on the detection of thiocholine generated by acetylcholinesterase. Organophosphorothionates slightly inhibited acetylcholinesterase, and P = S in chlorpyrifos was oxidized into P = O to improve the toxicity. Optimized...
Square wave anodic stripping voltammetric detection of Cd2+ and Pb2+ was carried out on sputtered planar platinum electrodes, modified with interpenetrated multiwalled carbon nanotubes/poly(1,5-diaminonaphthalene) (MWCNT/P1,5-DAN) as a sensing interface. Electrochemical behavior of the sensor was investigated by cyclic and square wave voltammetry. Key parameters affecting sensor performance such as...
Novel mixed matrix polyvinylchloride-based electrodialysis heterogeneous cation-exchange membranes were prepared by casting technique. Ilmenite (FeTiO3) was employed as additive in membrane fabrication. The effect of additive concentration on electrochemical properties of membranes was studied. Water content was decreased slightly by increase of FeTiO3 concentration. Ion-exchange capacity was improved...
In this study, a very sensitive method is described for selective accumulation and determination of trace amounts of antimony based on the antimony–bromopyrogallol red (BPR) complex adsorption onto a carbon paste electrode modified with multi-walled carbon nanotubes. The overall analysis involved a three-step procedure: a closed-circuit accumulation step onto the modified carbon paste electrode, reduction,...
In this paper, we investigate the dielectric properties of aqueous LiOH solution over frequency range 20 MHz~20GHz. The system behavior is well described according to four Cole–Cole (CC) terms whose evolution with composition is analyzed. Applying the extended Froehlich theory, we reveal the dual nature of water–ion and water–dipole interaction and propose an overview of the effects that water–ion...
Novel composite membranes composed of polyvinyl alcohol (PVA) as host with montmorillonite (MMT) were prepared by solution casting method. A maximum conductivity of 0.9527 S cm−1 was obtained at room temperature for the composite membrane of PVA (80)-H+MMT(20). Fourier transform infrared spectroscopy (FTIR) studies confirmed the functional groups present in the membranes. The exfoliation of composite...
The main challenge facing liquid electrolyte-based dye-sensitized solar cells (DSSCs) is the leakage and valorization of organic solvents limiting the long-term durability and practical use of DSSC. Therefore, the solidification of the electrolyte used in these devices has been one of the most crucial research directions in the field of DSSC. In the present work, we have assembled a dye-sensitized...
In the present work, the use of a pretreated graphene as a support for electrocatalyst is presented. To confirm the role of pretreatment, the properties of Pt/graphene (Pt/G) was compared with Pt/pretreated graphene (Pt/PANI-G). Two electrocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), and its electrochemical...
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