50 Result(s)
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Article
Kinetics of solid-phase H+/M+ ion exchange on hafnium hydrogen phosphate
The kinetics of solid-phase reactions between hafnium hydrogen phosphate and alkali metal chlorides were studied by thermogravimetry with subsequent analysis of leaving gases. For sodium and potassium chloride...
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Article
Cation mobility in modified Li1 − x Ti2 − x Nb x (PO4)3 lithium titanium NASICON phosphates
Li1 − x Ti2 − x Nb x (PO4)3 NASICON materials are prepared and studied by X-ray diffraction, 7Li and 31P NMR spectroscopy, and imp...
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Article
Phase transitions and ion transport in NASICON materials of composition Li1 + x Zr2 − x In x (PO4)3(x = 0–1)
NASICON materials of composition Li1 + x Zr2 − x In x (PO4)3(x = 0–1) were synthesized. The phase constitution, particle size, and...
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Article
Phase transitions of the NASICON-type mixed phosphates LiM2(PO4)3 (M = Ti, Zr) and LiInNb(PO4)3
The structural phase transitions of LiTi2(PO4)3, LiInNb(PO4)3, and LiZr2(PO4)3 have been studied by X-ray diffraction, impedance spectroscopy, 7Li NMR spectroscopy, and calorimetry. The results indicate that, as ...
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Article
Synthesis and characterization of MF-4SK + SiO2 hybrid membranes modified with tungstophosphoric heteropolyacid
Composites based on MF-4K perfluorinated cation-exchange membranes doped with hydrous silica nanoparticles, which were precipitated under various conditions, and with tungstophosphoric heteropolyacid nanoparti...
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Article
Water self-diffusion and ionic conductivity in perfluorinated sulfocationic membranes MF-4SK
Water self-diffusion and ion mobilities in various ionic forms (H+, Li+, Na+, Rb+, Cs+, and Ba2+) of perfluorinated sulfocationic membranes MF-4SK were studied by NMR and impedance spectroscopy. When degrees of h...
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Article
Diffusion mobility of alkali metals in perfluorinated sulfocationic and carboxylic membranes as probed by 1H, 7Li, 23Na, and 133Cs NMR spectroscopy
The hydration, state, and ion mobility of protons and alkali metal cations (Li+, Na+, and Cs+) in perfluorinated sulfocationic membranes (MF-4SK) and carboxylic membranes (F-4KF) were studied using NMR and impeda...
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Article
Ion transport mechanism in hybrid MF-4SC membranes modified by silica and posphotungstic heteropoly acid
Transport properties of MF-4SC perfluorinated cation-exchange membrane composites containing hydrous silica and phosphotungstic heteropoly acid (PTA) nanoparticles were studied at various temperatures. Modific...
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Article
Lead bipyridyl hexacyanoferrate complex
A low-solubility complex [PbBipy2]6[Fe(CN)6]4 · Bipy · 14H2O was prepared and characterized by physicochemical methods. Although containing [PbBipy2]2[Fe(CN)6] discrete species and a {[PbBipy2][Fe(CN)6]} ...
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Article
Microstructure and ion transport in Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials
Li1 + x Ti2 − x M x (PO4)3 (M = Cr, Fe, Al) NASICON-type materials have been prepared by the Pechini process and solid-state reactions and charact...
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Article
Catalytic properties of composite materials based on mesoporous silica and zirconium hydrogen phosphate
We have synthesized composite materials based on SBA-15 mesoporous silica and zirconium phosphate. The materials have been characterized by scanning electron microscopy, transmission electron microscopy, induc...
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Article
Synthesis and ionic conductivity of Li4Ti5O12
Lithium titanate, Li4Ti5O12, has been synthesized by the Pechini process, citrate route, and EDTA-citrate route at various final annealing temperatures. The materials obtained have been characterized by scanning ...
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Article
Anode material based on nanosized lithium titanate
An anode material based on lithium titanate Li4Ti5O12 with a particle size of 4–5 nm was obtained. Decreasing particle size of lithium titanate significantly changes its electrochemical properties. First of all, ...
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Article
Synthesis and ionic conduction of sodium titanate Na2Ti3O7
Chemical and phase transformations in the course of synthesis of sodium titanate Na2Ti3O7 have been studied. Prepared sodium titanates have been characterized by X-ray powder diffraction analysis, scaning electro...
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Article
Effect of particle size on the conductive and electrochemical properties of Li2ZnTi3O8
We have studied the effect of final annealing temperature on the formation of lithium zinc titanate, its electrical conductivity, and its electrochemical performance. Li2ZnTi3O8 has been shown to form in a wide r...
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Article
Low- and intermediate-temperature proton-conducting electrolytes
We consider the main achievements and problems in the field of proton-conducting solid electrolytes. Because of the extremely small proton radius, mechanisms of proton transport differ drastically from those f...
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Article
High-temperature and composite proton-conducting electrolytes
This paper presents a continuation of a review of research on proton-conducting solid electrolytes. We consider high-temperature proton-conducting materials based on mixed oxides of polyvalent elements whose s...
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Article
Electrochemical properties of Li4Ti5O12/C and Li4Ti5O12/C/Ag nanomaterials
We have prepared and characterized lithium titanate-based anode materials, Li4Ti5O12/C and Li4Ti5O12/C/Ag, using polyvinylidene fluoride as a carbon source. The formation of such materials has been shown to be ac...
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Article
Surface modification of zirconia with acid groups
We have studied the effect of surface modification with acids and subsequent heat treatment on the properties of hydrous zirconia. It has been shown that surface modification with phosphate and sulfate groups ...
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Article
Synthesis, Structure, IR-Spectroscopic Characterization, and Ionic Conductivity of Mg0.5Zr2(AsO4)x(PO4)3 − x
Mg0.5Zr2(AsO4)x(PO4)3 − x arsenate phosphates have been prepared by a sol–gel process and characterized by X-ray diffraction, IR spectroscopy, and impedance spectroscopy. The results indicate the formation of a c...
