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Nanosize carbon-coated samples of the solid solution LiNi1−yCoyPO4 were prepared and investigated with respect to high-voltage cathode materials (4–5 V) for Li-ion batteries. For the syntheses, a modified non-aqueous sol-gel approach under argon atmosphere was applied. Crystal structure and morphology of the products were analyzed by X-ray powder diffraction, scanning electron microscopy, and Raman...
Mg-7.5Li-3.5Al and Mg-7.5Li-3.5Al-1Y alloys are prepared, and their electrochemical performances are investigated by potentiodynamic polarization, potentiostatic current-time curves, electrochemical impedance spectroscopy, scanning electron microscopy (SEM), varying load performances, and utilization efficiencies. The performances of the Mg-H2O2 semi-fuel cells with the above alloy anodes are also...
We present a simple versatile strategy to synthesized the Si/C composites as anode material for lithium batteries through the pyrolysis of starch as the precursor. Different ratios of Si to starch are used to optimize the compound and the electrochemical properties of the composites. The structure and morphology of the Si/C composites are investigated systematically by thermogravimetric and differential...
Cetyltrimethylammonium bromide (CTAB) was used as surfactants to modify the crystallization of β-Ni(OH)2 via a simple ammonia-evaporation/CTAB-induced method onto nickel foam by using a mixed aqueous solution of nickel nitrate, CTAB, and ammonia. Their structure and surface morphology are characterized by X-ray diffraction and scanning electron microscopy. The SEM images show changes in the microstructure...
Graphene nanosheets (GNs) were prepared by one-pot solvothermal reduction in ethanol at different temperatures as supercapacitor electrode materials. The results of X-ray diffraction showed that the layer-to-layer distance of GNs decreased with the increase of temperature. Compared to graphite oxide (GO), these decreased values indicated that the enhanced temperature promoted the deoxidization...
Carbon–ceramic electrode modified with 1-allyl-3-methyl imidazolium tetraflouroborate ionic liquid was constructed. Scanning electron microscopy, X-ray diffraction analysis), energy dispersive X-ray analysis proved that the deposition of ionic liquid on the surface of carbon–ceramic electrode caused formation of graphene nanoplatelet-like structures on its surface. This electrode was used...
In this paper, we successfully synthesized NiFe 2 O 4 nanofibers via simple electrospinning process followed by calcination process. Only peaks of NiFe 2 O 4 could be observed from X-ray diffractometry patterns, indicating the formation of pure compound. Scanning electron microscope and transmission electron microscopy images showed the as-spun...
A unique ionic liquid polymer (ILP)-assisted method is developed for preparation of PdPt nanoparticles (NPs) on carbon nanotubes (CNTs). Due to its intrinsic hydrophilicity and regularly arranged imidazolium cationic functional groups, ILP induces the growth of uniform PdPt NPs with an average size of 3.5 ± 0.5 nm on CNTs. The cyclic voltammetry and amperometric studies indicated that the resulting...
Proton-conducting electrolyte with Sm and Y co-doped BaCeO 3 (BaCe 0.8 Sm 0.1 Y 0.1 O 3-δ , BCSY) were prepared by sol–gel combustion method. The characterization of proton-conducting electrolyte was evaluated in saturated humidity by structure identification, such as X-ray diffraction (XRD). Anode-supported cell with configuration...
Carbon source is a very important factor for the quality of derived carbon coating layer. With this regard, phenanthroline is introduced as carbon source in this work with the aim of getting high-rate Li 4 Ti 5 O 12 /C composite. The effect of coated carbon on the structure, morphological, and electrochemical characteristics is studied in details. In comparison...
The objective of this study was to develop a pH sensor for monitoring hydrogen ion activity in situ in oilfield-produced water under subsurface conditions. An iridium oxide film was prepared, and the performance of the iridium oxide film was evaluated in produced water using a series of high salinities, temperatures, and pressures. Scanning electron microscopy (SEM), energy-dispersive X-ray...
In this work, we demonstrate a simple and effective activation-free carbonization method to prepare porous carbon from lotus seedpod shell―a kind of natural biomass. It reveals that the carbonization temperature plays a crucial role in the determination of surface areas and capacitive performances of as-obtained porous carbon samples. The pore size and specific surface area of the samples were...
In this paper, a new electrochemical oxalic acid (OA) sensor based on graphene (GR)-modified carbon ionic liquid electrode (CILE) was proposed. The GR nanosheets were deposited on the surface of CILE by electroreduction with graphene oxide as precursor and electrocatalytic oxidation of OA on GR/CILE was further investigated. As compared with that of bare CILE, the oxidation peak current of...
Nanocomposite polymer blend electrolytes composed of PEO–P(VdF-HFP)–LiClO 4 were prepared for various concentrations of TiO 2 nanofiller. All the composite electrolytes were subjected to ultrasonic irradiation for enhancing the ionic conductivity of the composite electrolytes. It was noted that the ultrasonic irradiated samples exhibited a higher ionic conductivity than...
Perovskite materials exhibiting proton and oxide ion conductivities have been utilized for various energy-related applications such as solid oxide fuel cells (SOFCs), hydrogen production, gas sensors, etc. Nowadays, perovskites are being synthesized as nanoperovskites and studied for catalytic activity and energy-related applications. In this article, their synthesis in brief, the mechanism of proton...
A novel polymer electrolyte membrane comprising poly(ethylene carbonate) (PEC), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, and N - n -butyl- N -methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr 14 TFSI) ionic liquid is prepared by a solvent-free procedure, combining annealing and hot-pressing. The electrochemical properties...
In this study, chemically and electrochemically derived graphenes (CG and EG) were synthesized to form manganese dioxide (α-MnO 2 )/graphene nanocomposite cathode material for zinc primary cell. The discharge capacity of prepared nanocomposites was studied using Swagelok-type cell setup, where α-MnO 2 /graphene was used as a cathode and zinc as an anode along with an...
The synthesis as well as the electrochemical properties study of highly crystalline ZnCo 2 O 4 powders is presented. ZnCo 2 O 4 powders with a particle diameter of 15–35 nm have been successfully prepared with the surfactant-mediated method. The thorough structural characterization including X-ray diffraction (XRD), scanning electron microscopy...
To study the effect of Fe and/or Zn doping on the performance of LiMnPO 4 , LiMn 0.9 Fe 0.1− x Zn x PO 4 /C ( x = 0, 0.05, and 0.1) composites were synthesized by a solid-state process. They are all single phase with olivine structure but LiMn 0.9 (FeZn) 0.05 ...
In this work, we report a general and feasible approach for the fabrication of Fe 3 O 4 /carbon nanotubes (CNTs) nanocomposite through a hydrothermal method followed by an in situ thermal reduction, without any reducing agents. The nanocomposite was characterized by x-ray power diffraction (XRD) and scanning electron microscopy (SEM). The results revealed that the CNTs...
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