Ruslan R Kayumov

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• PhD
• Senior Researcher at Russian Academy of Sciences

Single-ion conducting polymer electrolytes have received great attention due to their potential applications in electrochemical energy sources. In this work we have in detail studied features of ion transport of alkali metal ions in the polymer electrolytes based on Nafion plasticized with DMSO. The samples have been characterized by DSC, FTIR, and...

A series of nickel(II) complexes based novel mono- and bis-formazan ligands has been synthesized and characterized with IR, UV, NMR spectroscopies, CHN analysis, mass spectrometry, and single crystal X-ray diffraction analysis. The prepared complexes have been tested for catalytic activity in ethylene oligomerization.Graphical abstractA series of n...

The influence of doping of Nafion®115 membranes with inorganic acids on the transport characteristics at temperatures from 50 to–80°C was studied. The dependence of the conductivity of these membranes on the acid concentration is nonlinear and correlates well with the ion conductivity of the aqueous solutions of the doping acids. The proton conduct...

The lithium-ion conductivity of the lithium form of the commercial perfluorinated membrane Nafion-115 was studied in a series of aprotic solvents in a wide temperature range. The highest ion conductivity was obtained for the sample kept in N,N-dimethyl formamide (DMF); its use in lithium-ion batteries, however, is restricted by its low electrochemi...

Effective proton conductors based on calix(4)arene sulfonic acid and CX3COOH (where X = H, F, Cl) with molar ratio 1:1 were obtained in crystalline form. It was demonstrated that the original calixarene sulfonic acid and its complex with CCl3COOH, and complexes with CH3COOH and CF3COOH have pairwise similar structures and similar proton transport p...

The development of efficient polymer electrolytes represents a crucial step in enhancing the safety of lithium and sodium-ion batteries. The perfluorinated membranes studied in this work offer a cost-effective alternative to the commonly used Nafion membrane. The paper presents data on a study of the molecular and supramolecular structure, thermal...

The rapidly developing field of portable energy sources requires the search and development of effective materials for such devices. To improve the safety of the most common metal-ion batteries (lithium- and sodium-ion), instead of a liquid electrolyte, it is proposed to use a gel-polymer electrolyte with unipolar conductivity based on a Nafion-lik...

The current study focuses on the production of biochars derived from aquatic plants, specifically red seaweed Ahnfeltia and seagrass Zostera and Ruppia, found in brackish lagoons in the Sea of Okhotsk, Sakhalin Island. These biochars were obtained through a stepwise pyrolysis process conducted at temperatures of 500 and 700 °C. The characteristics...

The effect of the composition of a binary plasticizing mixture based on dimethyl sulfoxide and sulfolane on the physicochemical properties of the lithium form of the Nafion membrane is studied. To explain the behavior of the electrotransport properties of membranes, experimental studies of intermolecular interactions, thermal behavior, and the ion-...

В работе исследовано влияние состава двойной пластифицирующей смеси на основе диметилсульфоксида и сульфолана на физико-химические свойства литиевой формы мембраны Нафион. Для объяснения поведения электротранспортных свойств мембран проведены экспериментальные исследования межмолекулярных взаимодействий, термического поведения, а также ион-транспор...

The physicochemical properties and ionic conductivity of Nafion polymer membrane in sodium form plasticized with such organic solvents as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC) and their ternary mixtures were studied. According to the results of gravimetry, simultaneous thermal analysis, IR spectroscopy, small-a...

The review analyzes and summarizes the results of investgations of lithium-conducting polymer electrolytes obtained via ion exchange from the initial H+ form of perfluorinated sulfonic cation-exchange membranes of the Nafion family. Salt forms of membranes not only retain the high strength and chemical stability inherent in the parent materials, bu...

The development of post-lithium current sources, such as sodium-ion batteries with improved energy characteristics and an increased level of safety, is one of the key issues of modern energy. It requires the search and study of materials (including electrolytes) for these devices. Polyelectrolytes with unipolar cationic conductivity based on Nafion...

The physicochemical properties of composite solid electrolytes based on acid ammonium salt of 12-phosphotungstic acid and calixarene sulfonic acid with uniform distribution were investigated. The proton conductivity was determined by the content and conductivity of calixarene and has the form of a saturation curve with reaching its maximum (0.1 S/c...

The effect of the calcination temperature on the structure and properties of acidic ammonium salt (NH4)2HPW12O40 was studied. The absence of the influence of the calcination temperature of the samples on their particle size distribution, thermal stability and water content was shown. In the investigated range from 300 to 450 °C, a nonmonotonic chan...

The electrotransport characteristics of the polymer electrolyte based on lithiated Nafion-115 membrane plasticized by high-boiling dipolar aprotic solvents—sulfolane (SL), ethylene carbonate (EC), and diglyme (G2) and also by their binary and ternary mixtures are studied in a wide temperature interval (from –60 to +80°C). The best transport propert...

The use of dipolar aprotic solvents to swell lithiated Nafion ionomer membranes simultaneously serving as electrolyte and separator is of great interest for lithium battery applications. This work attempts to gain an insight into the physicochemical nature of a Li-Nafion ionomer material whose phase-separated nanostructure has been enhanced with a...

A Nafion-115 membrane in its lithiated form (Li-Nafion) was plasticised using a binary mixture of ethylene carbonate (EC) and sulfolane (SL) to obtain a polymer electrolyte with single-ion lithium conductivity and enhanced stability. The weight fraction of SL in the binary mixture varied from pure EC to pure SL with a step of 5-10 wt. %. Quantum ch...

Quantum chemical modeling is performed for the distancing of lithium and ammonium cations from the –O–CF2–CF2–SO−3 functional group typical of Nafion-like polymer membranes in the presence of a different number of dimethylsulfoxide molecules. The cluster approach plus the B3LYP density functional and 6-31G* basis are used. It is found that cations...

Crystalline electrolytes in the system of calixarenesulfonic acids and low molecular weight acids were synthesized and the features of their structure and parameters of proton transfer were studied in a wide range of relative humidity (RH = 20–75%) and temperature (+50 to –80°C). It was shown that the introduction of acids into a nanosized calixare...

The present work studies the solid-state lithium-ion full cell Li4Ti5O12/LiFePO4 with propylene carbonate swollen lithiated Nafion membrane (Li-Nafion) as both electrolyte and separator, and lithiated Nafion dispersion–as a binder. The advantage of this cell is single-ion lithium conductivity of the polymer electrolyte preventing its polarisation,...

The work addresses the properties of electro-transport in highly ion-conductive polymer electrolytes based on Nafion-115 membranes in the NH4+ ionic form plasticized with dimethyl sulfoxide (DMSO). The ionic conductivity and the activation energy of the conductivity were found to exhibit three types of behavior as a function of the plasticizer. The...

Nafion-NH4+ membranes plasticized with dimethyl sulfoxide (DMSO and DMSO-d6) have been investigated at room temperature using the vacuum ATR-FTIR and FTIR absorption spectroscopic technique in the range 50–4000 cm−1. The amount of the plasticizer corresponds to the molecular ratio n = DMSO/NH4+ = 2.7–13.8. The mutual association of free DMSO molecu...

Calix[4]arenesulfonic acid complexation with perchloric acid is studied. The stoichiometric composition of the complex is shown to be calix[4]arene/HClO4 = 1/1. The complex is most stable against humidity changes as far as its proton-conducting properties are concerned. Its specific proton conductivity varies from 3 × 10–3 to 5 × 10–2 S/cm; the con...

Nafion membranes plasticized with dimethyl sulfoxide (DMSO) have been examined at room temperature using the vacuum ATR - FTIR spectroscopic technique in the range 50–4000 cm− 1. The amount of the plasticizer corresponds to the molecular ratio n = DMSO/H+ = 1.2, 2.3, 4.8, 7.0, 9.7 and 13.3. The medium intensity band with two maxima at 780 and 853 c...

The products of solvation of lithiated Nafion with dimethylsulfoxide (DMSO) have been studied by ATR IR spectroscopy in the frequency range of 50–4000 cm–1 in a vacuum at room temperature. Degree of solvation n = DMSO/Li has been varied in a range of 1.5–18.4. Based on analysis of the dependence of the spectral parameters on the n value, it has bee...

The effect of a change in the ambient temperature and humidity on the behavior of calix(4)arene-para-sulfonic acid was studied. For the calixarene under study, at least two stable hydrates were observed: tetra- and octahydrate. The number of water molecules in the crystalline hydrate of the acid was confirmed by simultaneous thermal analysis data a...

A series of nickel(II) complexes based novel mono- and bis-formazan ligands has been synthesized and characterized with IR, UV, NMR spectroscopies, CHN analysis, mass spectrometry, and single crystal X-ray diffraction analysis. The prepared complexes have been tested for catalytic activity in ethylene oligomerization.

The influence of the temperature, the pressure, the Al/Ni molar ratio, and the position of chlorine-containing substituents in formazan ligands on the reaction kinetics and the product composition in the ethylene oligomerization catalyzed by thea system based on nickel(II) formazanates and ethylaluminium dichloride has been studied. It has been sho...