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Russian Journal of Electrochemistry
Journal Prestige (SJR): 0.29  Citation Impact (citeScore): 1 Number of Followers: 4  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1608-3342 - ISSN (Online) 1023-1935 Published by Springer-Verlag  [2468 journals]
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- The Effect of Structure of Porous Components of Electrochemical Devices on
Their Characteristics (A Review)-
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Abstract: Literature concerning the principal problems is analyzed. Basic characteristics of porous structures and methods of their determination are described, in particular, the pore distribution in radii, full porosity, the specific surface area, hydrophilic–hydrophobic properties. The effect of porous structure on the electrochemical characteristics of the following devices is discussed: lithium-ion and lithium-oxygen batteries, fuel cells with proton-exchange membrane, supercapacitors, electrodialyzers, and devices for water capacitive deionization (desalination).
PubDate: 2023-05-01
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- Si@SiOx/CNF Flexible Anode Prepared by Electrospinning for Li-Ion
Batteries-
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Abstract: Si@SiOx/CNF flexible composite films were prepared by electrospinning, oxidation stabilization and high-temperature pyrolysis. The composites’ physical properties and electrochemical performances were characterized in detail to clarify their structure, actual composition, and the influence of silicon on the capacity utilization rate and stability of the anode composites. The results show that the Si@SiOx particles are formed in oxidation process and embedded into the carbon fiber matrix to form a three-dimensional network structure. With the increase of nano-silicon content, the agglomeration of nano-silicon particles inside and on the surface of the fiber intensifies, and the specific capacity of the composite increases first and then decreases. When the content of nano-silicon is about 34.87 wt %, the theoretical specific capacity utilization rate of the composite is about 67.71%. Moreover, the three-dimensional flexible composite has a higher discharge specific capacity 1085 mA h/g after 100 cycles at 0.1 A/g and better cyclic stability.
PubDate: 2023-05-01
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- Electrodeposition and Performance of Bright Nickel–Rhenium Coatings
Obtained from Watts-Type Electrolytes-
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Abstract: Nickel–rhenium (Ni–Re) alloy coatings were electroplated from Watts-type electrolytes. The influences of deposition variables on the appearance quality, chemical composition, the partial deposition current density, and the Faradaic efficiency (FE) were optimized, simultaneously microstructure, phases, roughness, optical, microhardness and abrasion resistance of the coatings were investigated. The optimal deposition variables were current density of 5 mA cm–2, pH of 5.5 and bath temperature of 60–70°C. Ni-rich alloy coatings with the FE as high as 99.5% and Re-content as high as 43 wt % were obtained. A bright Ni80Re20 coating with a low surface roughness of 9.17 ± 1.79 nm was obtained under the optimal deposition variables. The fcc-Ni(Re) and hcp-Re phases co-existed in Ni80Re20 coating. The Specular Component Include (SCI) value for the reflectivity of Ni80Re20 coating was 42.9 ± 0.7%. The surface quality, microhardness and abrasion resistance of the alloy coating by the addition of 20 at % Re was improved.
PubDate: 2023-05-01
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- Erratum to: Inhibitive Properties and Computational Approach of
Organoselenides on Mild Steel Corrosion in Acidic Environment-
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Abstract: An Erratum to this paper has been published: https://doi.org/10.1134/S1023193523040122
PubDate: 2023-04-01
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- Specific Features of the Electronic Structure of Oxygen-Deficient
Perovskites SrFe1 – xMoxO3 – y-
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Abstract: By using the VASP package, within the framework of the DFT approach, the properties of the ground state of the SrFe1 – xMoxO3 – y oxide with the perovskite structure are calculated for the various values of molybdenum content and oxygen nonstoichiometry. It is shown that the doping procedure as well as the procedure of varying the oxygen content give rise to changes in the charge stage of oxygen ions in the system, which is accompanied by a shift of the Fermi level with respect to the invariant band structure (rigid band model) and the transition to the semimetal conduction type.
PubDate: 2023-04-01
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- Synthesis and Conductivity of Heterogeneous Compositions Bi4V2 –
хFeхO11 – d/n% FeOу (m% Al2O3)-
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Abstract: The structure and electrophysical characteristics of Bi4V2 – хFeхO11 – δ (BIFEVOX, where х = 0.3, 0.5) and its heterogeneous mixtures Bi4V2 – хFeхO11 – δ/n% FeOy and Bi4V2 – хFeхO11 – δ/m% Al2O3 are studied by varying their composition and the thermodynamic parameters of the environment. The crystallochemical parameters of individual compounds are calculated. The phase and elemental composition of samples is assessed using the XRD method and the scanning electron microscopy with energy-dispersive spectroscopic microanalysis; for individual phases, the absence of phase transitions is observed. The conductivity of materials is studied by the impedance spectroscopy. No composite effect is observed in these systems.
PubDate: 2023-04-01
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- Conductivity of Composites MeWO4–Al2O3 (Me = Ca, Sr)
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Abstract: Composites (1 – x)MeWO4–xАl2O3 (Me = Ca, Sr) are synthesized by the solid-phase method. Their phase composition and thermodynamic stability are confirmed by the XRD and TG-DSC data, respectively. Their morphology is studied by the SEM-EDA method. The conductivity of composites is studied by the method of electrochemical impedance spectroscopy as a function of the temperature, the gas-phase oxygen pressure, and the content of added disperse Аl2O3. It is shown that composites (1 – x)MeWO4–xАl2O3 (Me = Ca, Sr) are ionic conductors and their conductivity is 4–12 times higher as compared with the corresponding tungstates.
PubDate: 2023-04-01
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- Oxygen-Ionic Conductivity in Isovalent-Doped Layered BaLaInO4-Based
Perovskites-
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Abstract: — The oxygen-ionic conductivity of isovalent-doped complex oxides characterized by the Ruddlesden–Popper structure is studied. The BaLa0.9Nd0.1InO4 sample was obtained for the first time by substitution in the La sublattice, and its transport properties are studied. A comparing of the results with the data for samples obtained earlier by isovalent substitution in the In-sublattice of BaLaInO4 is presented. The introducing of a dopant is shown to lead to increase in the contribution from oxygen-ionic conductivity and also in the total conductivity by ~2 orders of magnitude.
PubDate: 2023-04-01
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- Sulfonated Anthraquinone-Based Ionic Complexes as a Promising Organic
Negolyte for Redox-Flow Batteries-
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Abstract: Due to its high solubility and fast kinetics of redox reactions, anthraquinone-2,7-disulfonic acid is a promising electroactive molecule for redox-flow-battery electrolytes and other energy applications. However, its widespread use is currently limited, primarily due to its tendency to chemical side-reactions and the formation of quinhydrone complexes between the molecule’s different redox-forms. The possibility of overcoming these shortcomings by using a simple anthraquinone-2,7-disulfonic acid functionalization with the poly(diallyldimethylammonium) polycation is studied. The ionic complexes are shown to be formed in this mixture, which leads to the suppression of the quinhydrone compound formation. At the same time, the poly(diallyldimethylammonium)/anthraquinone-2,7-disulfonic acid mixtures retain their redox activity and can be used as a negolyte in anthraquinone–bromine redox flow batteries, while all key characteristics of such a battery are comparable with those of anthraquinone–bromine redox flow batteries which used anthraquinone-2,7-disulfonic acid without any additives. The poly(diallyldimethylammonium)/anthraquinone- 2,7‑disulfonic acid-based battery (0.1 M anthraquinone-2,7-disulfonic acid) has the power density of 105 and 65 mW/cm2 for the battery state-of-charge values 100% and 50%, respectively; the energy efficiency for five charging–discharging cycles, 57.4%. In the future, the composition of the poly(diallyldimethylammonium)/anthraquinone-2,7-disulfonic acid ionic complexes can be optimized, in order to maintain good kinetics and solubility of anthraquinone-2,7-disulfonic acid and at the same time reduce the intensity of chemical side-reactions, including quinhydrone-complexes formation.
PubDate: 2023-04-01
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- Voltammetric Determination of Tibolone on a Nano-Composite Electrode
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Abstract: In this work, very simple and swift method for the assessment of synthetic steroid Tibolone, which was banned by World Anti-Doping Agency (WADA) has been developed. A glassy carbon electrode modified with CuO nanoparticles and multi-walled carbon nanotubes was used. The effect of scan rate, pH of the medium, and concentration of nano-suspension has been studied using cyclic voltammetry in 0.1 M phosphate buffer solution. Linear sweep voltammetry was used for the quantification of Tibolone. The modified electrodes shows linearity range of 15 to 80 μM Tibolone with limit of detection of 1.05 μM and limit of quantification of 3.51 μM, respectively. Further the present method was successfully applied to determine Tibolone in pharmaceutical formulations and urine sample.
PubDate: 2023-04-01
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- Electrocatalytic Properties of Iron Ferrite (Fe3O4) Obtained by Thermal
Decomposition Method Using Egg White (Ovalbumin)-
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Abstract: Nano-sized spinel oxide iron ferrite (Fe3O4) was obtained by thermal decomposition method using egg white (ovalbumin) at 500°C and characterized by physicochemical (TGA, IR, XRD, and SEM) and electrochemical (CV, impedance, and Tafel polarization) techniques. The characteristic vibration bands in FTIR (449–590 cm–1) and XRD powder patterns of decomposed oxide showed the formation of nano-sized (~28 nm) spinel-type oxide. The electrocatalytic performance of iron ferrite was investigated by CV, impedance, and Tafel polarization techniques. Fabricated GC/Fe3O4-electrode showed sluggish kinetic behaviour towards oxygen evolution reaction (OER) in 1 M KOH solution. Tafel slopes for OER at lower and higher overpotential regions were observed at 93–140 mV decade–1, and thermodynamic parameters such as activation energy (Ea) and electrochemical entropy of reaction were estimated from the Arrhenius plot, and it was found to be ~23 KJ mol–1 deg–1 and –204 J mol–1 respectively.
PubDate: 2023-04-01
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- One-Step Plasma-Assisted Electrochemical Synthesis of Nanocomposites of
Few-Layer Graphene Structures with Manganese Oxides as Electrocatalysts
for Oxygen Reduction Reaction-
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Abstract: Using the method of plasma-assisted electrochemical exfoliation of graphite, a nanocomposite, which consists of few-layer graphene structures with surface decorated with manganese oxides nanoparticles, is synthesized in one-step process. It is found that this material exhibits a high electrocatalytic activity towards the oxygen reduction reaction due to the presence of manganese in the +2 and +3 oxidation states, and also carbonyl (quinone) functional groups on the surface of graphene structures.
PubDate: 2023-04-01
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- Ionic (O2– and H+) Transport in Oxygen-Deficient Perovskites
La2Me+3ZnO5.5-
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Abstract: The paper is devoted to the study of the conduction mechanism in perovskite phases with composition La2Me+3ZnO5.5 (Me+3 = Al3+, Sc3+, In3+). The phases were synthesized by a standard ceramic technique in the 700–1300°C temperature range. The structure of the La2InZnO5.5 and La2ScZnO5.5 samples is orthorhombic, while the La2AlZnO5.5 sample crystallizes in the cubic symmetry. The electrical conductivity of La2Me+3ZnO5.5 (Me+3 = Al3+, Sc3+, In3+) samples is studied as a function of temperature (200–900°C), oxygen partial pressure pO2, and humidity pH2O. The complex oxides are found to have a mixed type of conduction in air, the electronic contribution (the p-type conduction) increases with increasing temperature. The phases exhibit the dominant oxygen-ion transport at temperatures below 500°C. In wet atmosphere, Sc3+- and In3+-containing samples are capable of incorporating water from gas phase and forming proton defects. No significant proton transport in the La2AlZnO5.5 sample is realized. The partial conductivities \({{\sigma }_{{{{{\text{H}}}^{ + }}}}}\) , \({{\sigma }_{{{{{\text{O}}}^{{2 - }}}}}}\) , σh in a wide range of temperatures and рО2 are discussed.
PubDate: 2023-04-01
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- MOF(ZB)/Potassium Citrate-Derived Porous Carbon Composite and Its
Electrochemical Properties-
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Abstract: Metal-organic frameworks (MOFs) are of great interest material due to its well-defined pores, large surface areas and abundant coordinatable structures. Herein, a {[Zn(BTC)]·2H2O}n·MOF (ZB) (BTC = 1,3,5-Benzenetricarboxylic acid) was synthesized via high-temperature hydrothermal method, then direct carbonization of the combination of {[Zn(BTC)]·2H2O}n·MOF/potassium citrate with different mass ratios a porous carbon composite materials (ZBPC-T-A) was obtained (P refers potassium citrate, C refers porous carbon, T refers the carbonization temperature, and A refers the mass ratio of ZB crystals to potassium citrate). The ZBPC-800-1:5 with mesoporous structure shows a high specific surface area of 1592 ± 36 m2 g–1. To further illustrate the properties of ZBPCs, the MOF-derived porous carbon materials ZBPCs was applied as electrode material for supercapacitor, the results indicate the excellent electrochemical properties, stable multiplicity and cycling performance of ZBPCs. The specific capacitances were 157 ± 3 F g–1 for ZBC-800 and 201 ± 2 F g–1 for ZBPC-800-1:5 at a current density of 1.0 A g–1, respectively. The specific capacitance decay rates were 22.39% for ZBC-800 and 21.90% for ZBPC-800-1:5 when the current density was increased from 1.0 to 10.0 A g–1, respectively. After 5000 cycles, the capacitance retention rate was still 90.41% for ZBPC-800-1:5 at a current density of 1.0 A g–1. The experiments show that the porous carbon composite materials can be used for energy storage, and it provides a new way to prepare porous carbon composite materials derived from MOFs.
PubDate: 2023-04-01
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- Analysis of Experimental Results of Defect Concentraions in the Surface
Layer of Acceptor Doped Ceria-
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Abstract: Recent experimental results of the dependence on oxygen partial pressure, P(O2), of the small polarons concentration in the monomolecular surface layer of doped ceria, are interpreted theoretically. Two different, experimental conditions are examined. First, the highly reduced surface of Sm0.2Ce0.8O1.9 – δ (SDC) is treated and the \({{[{\text{C}}{{{\text{e}}}^{{3 + }}}]}_{{\text{s}}}}{-}P({{{\text{O}}}_{2}})\) relations are evaluated. The experimental data are explained by a metallic surface layer, approximately neutral, i.e. with negligible transfer of charge to the bulk. The surface is metallic as the outer electrons on Ce3+ ions, which are small polarons when under low concentration, lose their localization under high concentration. Second, the surface of Pr0.1Ce0.9O2 – δ (PCO) is examined. The experimental data of \({{[{{\Pr }^{{3 + }}}]}_{{\text{s}}}}{-}P({{{\text{O}}}_{2}})\) relations are explained by a semiconducting, negatively charged, monomolecular surface layer forming a double layer with a positive bulk. In both SDC and PCO the surface defect concentration dependence on P(O2) is different from that of the bulk.
PubDate: 2023-03-01
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- Nanosized Complex of Metal–Ion-Exchanger Composites in the Oxygen
Electrochemical Reduction-
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Abstract: The role of primary (the particles’ size) and secondary (the particles’ content in the material) size effects of metal–ion-exchanger composites in the oxygen electrochemical reduction is elucidated. To this purpose, metal–ion-exchanger particulate composites with different grain size and the metal (Cu) particles’ content are prepared as spherical grains, based on macroporous sulfonic cation-exchange matrix (Lewatit K 2620). X-ray diffraction analysis showed the deposited metal basic particles to be nanosized. A special feature of the metal particles is that during the repeated cycles of their chemical deposition into the ion-exchange matrix pores both the capacity \(\varepsilon ,\) and the particles’ radius \({{r}_{0}}\) increased. On this reason, the primary and secondary size effects appeared being interconnected in a common nanosized complex \(f = {\varepsilon \mathord{\left/ {\vphantom {\varepsilon {{{r}_{0}}}}} \right. \kern-0em} {{{r}_{0}}}}.\) With the increasing of the capacity the complex increased up to certain limiting value, which is connected with percolation transition from separate metal clusters to collective associates. Correspondingly, the reduced oxygen specific amount also reached its constant value. The oxygen electroreduction process reached quasi-steady-state regime.
PubDate: 2023-03-01
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- Properties of Li1.3Al0.3Ti1.7(PO4)3 Lithium-Conducting Ceramics
Synthesized by Spark Plasma Sintering-
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Abstract: Results on the synthesis of lithium-conducting ceramics Li1.3Al0.3Ti1.7(PO4)3 by the method of spark plasma sintering (SPS) are presented. In the first stage, the monophase Li1.3Al0.3Ti1.7(PO4)3 solid-electrolyte powder is synthesized from the nitrate-peroxide precursor. Its subsequent consolidation by the SPS method provides the formation of ceramics with the high Li-ionic conductivity and the density on the level of 97–98%. The microstructure and the electrochemical properties of the Li1.3Al0.3Ti1.7(PO4)3 ceramics are studied.
PubDate: 2023-03-01
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- Prerequisites for Development of Electrochemical Planar Sensor Based on
RGO–PPD–SiW Composite for Determining Isoniazid Content in Biological
Liquids-
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Abstract: A new redox-active composite material based on reduced graphene oxide (RGO), poly-o-phenylenediamine (PPD), and silicotungstic acid (SiW) is studied. The SEM data showed an abrupt decrease in the content of oxygen atoms in the composite as compared to pure graphene oxide (GO). This is associated with its reduction to RGO in the course of RGO–PPD–SiW synthesis. A combination of RGO conductivity and redox catalysis due to the electroactive components (PPD and SiW) enables one to develop various sensors by applying RGO–PPD–SiW onto planar electrodes (screen-printed carbon electrodes, SPCE). In this work, the possibility of developing a sensor for the content of antituberculous antibiotic isoniazid (isonicotinic acid hydrazide C6H7N3O, INAH) is studied. Using the CVA method, it is shown that the concentration dependence of isoniazid oxidation current is linear. The electrocatalytic behavior of the composite during the isoniazid oxidation is also supported by the impedance spectroscopy.
PubDate: 2023-03-01
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- Preparation and Electrochemical Performance of V2O5/Flake Graphite
Material for Aqueous Zinc-Ion Battery-
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Abstract: Aqueous zinc batteries with low cost and inherent safety are considered to be the most promising energy storage devices. V2O5/Flake graphite material have been successfully synthesized via high-temperature magnetic stirring and sintering method. V2O5/Flake graphite material were characterized by X-ray diffraction, FESEM, XPS and TGA. The addition of flake graphite not only improves the conductivity of the cathode material, provides more active sites for the Zn2+ insertion/extraction process, but also has a certain isolation effect, avoiding the direct contact between the electrolyte and the V2O5 to cause dissolution. VC51 delivers a high discharge capacity of 328.1 mA h g–1 at 0.1 A g–1, good capacity retention of 81.4% after 300 cycles, shows good cycling stability.
PubDate: 2023-03-01
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- Transport Properties of In3+- and Y3+-Doped Hexagonal Perovskite
Ba5In2Al2ZrO13-
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Abstract: A complex oxide Ba5In1.9Y0.1Al2ZrO13 with hexagonal perovskite structure (a = 5.971(4) Å, с = 24.012(1) Å) is prepared for the first time. The phase is found to dissociative-absorb water from gas phase, the degree of hydration being as high as 0.39 mol Н2О. It was found by using IR-spectroscopy that protons are present therein as energetically nonequivalent ОН–-groups involved in hydrogen bonds of diverse strength. Isovalent yttrium-doping of the Ba5In2Al2ZrO13 phase is shown not to lead to any valuable change in the oxygen-ion-conductivity as compared with the Ba5In2.1Al2Zr0.9O12.95 acceptor doping that allows increasing the oxygen-ion-conductivity by a factor of 1.3. Both types of doping lead to increase in the proton conductivity and, as a corollary to this, an increase in the proton concentration. For these phases the degree of hydration depends on the cell parameters, hence, is determined by space availability for ОН–-groups in the barium coordination. Proton transport dominates in the Ba5In2Al2ZrO13, Ba5In2.1Al2Zr0.9O12.95, and Ba5In1.9Y0.1Al2ZrO13 phases below 600оС in humid atmosphere (pH2О = 1.92 × 10–2 atm).
PubDate: 2023-03-01
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