ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

Литиевые электрохимические системы

Kinetics and mechanism of titanium and zirconium anodic behaviour in organic perchlorate solutions

Kinetic patterns of thin anodic films formation for Ti and Zr in organic mediums are investigated. Influence of solvent nature and polarization is discussed by role surface complex consideration in oxide films growth on this metals.

Lithium cathode deposition in sulfolane electrolytes on stainless steel electrode

The effect of different lithium salts on the lithium behavior – cyclic cathode deposition and anodic dissolution – (cycling life) on stainless steel in sulfolane electrolytes is studied. It is shown that the overvoltage of electrode processes decreases in series LiBF4 > LiCF3SO3 > LiClO4 > Li2Sn. Maximum coulomb efficiency and cycling life of lithium are obtained in lithium polysulfides electrolyte solution.

The synthesis and investigation of nanostructured catalysts for electrochemical systems with proton-exchange membrane

Techniques of synthesis of high-effective nanostructured electrocatalysts for electrochemical systems with proton-exchange membrane (PEM) are described, their structural and electrochemical properties are investigated. Current-voltage curves of membrane-electrode assemblies (MEA) on the basis of synthesized electrocatalysts within PEM fuel cell, water electrolyser and reversible cell are obtained.

Nanosized two- and three-component Ru-based cathode catalysts

Methods of synthesis were developed; nanosize two- and three-component Ru-based cathode catalysts RuM/C and RuMSe/C (М – Ni, Co, Fe, V) supported on carbon XC-72 were synthesized and analyzed. The effect of different precursors, metal ratio, synthesis conditions, and nature of the Fe-group metal on the catalytic system activity in the oxygen reduction reaction is studied. The studies were performed using the method of the rotating disk electrode (RDE) in 0.5M H2SO4 and at the temperature of 60°C.

Studying kinetics of oxidation of glucose by bacterial cells Escherichia Coli by means of a method of a rotating disk electrode

The method of a rotating disk electrode leads studying the basic laws of electrochemical behaviour of mediator as basic electroactive component of bioelectrochemical system and influence of speed of rotation of an electrode, concentration of mediator, glucose and microbial cells are certain for the general speed of process bioelectrocatalitic oxidation of glucose.

Influence of some components of lead-antimony and lead-calcium alloys on their mechanical and corrosion properties

The influence of the concentration of antimony, tin, cadmium, calcium, silver, and barium on some characteristics of lead-antimony and lead-calcium alloys was studied. The cadmium-doped and barium-doped alloys show the best corrosion resistance among the lead-antimony and lead-calcium alloys, respectively.

New additives to active masses and electrolyte of sealed lead storage battery

Effect of high-collated carbon clusters (soots containing fullerenes and nanopipes) on electrode pastes structure have been studied and their positive effect on characteristics of the obtained active masses has been shown. Effect of partial hydrophobization of negative active mass (NAM) on efficiency of the closed oxygen cycle has been studied. Effect of different additives (С7H6O2, C8H8O2, (-CF3-CF25-)QZ) on ?H2 have been studied.

Treatment optimization of the positive active masses of alkaline batteries

The concept of processing of the positive electrode material taken from fulfilled alkaline accumulators, based on primary separation of an iron component from nickel at stages of hydrometallurgical repartition, is presented..

Performance of free-breathing PEM FC in limited-volume conditions

This paper represents performance of air-hydrogen free-breathing Fuel Cell (FC) in limited volume conditions. Research work was carried out with thin two-cell stacks related to use in prototype of particular power source system, which includes aluminium-water microgenerator of hydrogen. In small current densities field (<200 mA/cm2) it was established, that after FC had been confined within the small volume, characteristics of FC became better than in non-limited-volume conditions due to self humidification.

Lithium intercalation into thin-film lithium-tin and lithium-carbon electrodes: an impedance spectroscopy study

Reversible lithium intercalation from a non-aqueous electrolyte into thin films of tin (0.1–1 mcm) and carbon (-3 mcm) was studied by means of electrode impedance spectroscopy. The measurements were made within a frequency range of 105–10-2 Hz at a varying lithium concentration in the matrix. The paper discusses several versions of electrical equivalent circuits to simulate the experimental impedance spectra, and the concentration dependence of the lithium diffusion coefficient.