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

Водородная энергетика

Electrochemical activity of the cathodes with chemical coatings Ni-S-Fe

The electrochemical activity of nickel mesh cathodes activated by electrocatalysts of chemically deposited coatings Ni-S-Fe is investigated. The maximum reduction of overvoltage at current density 6 kA/m2 and temperature 70°C is 0.34 V. Comparison of the electrochemical activity of such cathodes with similar cathodes described in the scientific literature revealed that at the same temperature and same overvoltage the current density is twice higher than for the known electrodes.

Pyrolized carbon electrode material for supercapacitors obtained from organic raw materials of vegetable nature

In this paper we investigate carbon materials prepared from different organic raw materials of vegetable nature by the method of pyrolysis. Properties of obtained carbon substances are established by the methods of impedance spectroscopy, voltamperometry, and chronoamperometry. Starting from the data of electron paramagnetic resonance, impedance spectroscopy and an analysis of the Regon diagrams it is concluded that the obtained carbon materials contain carbon nanostructures in the form of bungles of multiwall nanotubes.

Electrochemical and mass-transfer processes in the system of electrochemical synthesis of nickel hydroxide

Mass-transfer processes are considered in a double-chamber running electrolyzer for the synthesis hydroxide of nickel (ІІ) from solution of NiSO4. The product of Ni(ОН)2 appears at co-operation of ions of Ni2+ the ions of ОН-, which are generated on a cathode. The mathematical model of processes is formulated. Decisions show dependence of concentrations of ions in a reactionary area from the managed parameters of process and current.

Electrolytic co-deposition Cobalt Oxide (III) with Nickel (III) and Chrome (III) oxides and formation of binary oxide compounds

With the help of the polarization curves method (E-lgIa) there are investigated the anode processes at Co2O3 anode deposition together with the doping additives – nickel (NiO, Ni2O3) and chromium (Cr2O3) oxides at the electrolysis from the mixed sulfate solutions. The possible mechanisms of these processes interconnection with nucleation and crystal growth of binary oxide compounds of Co-Ni and Co-Cr and crystal structure formation of anode deposits are considered.

Energy installation system of navigational equipment with computer control

Results of field trials of the prototype energy installation system of navigational equipment (SNE) with computer control are presented. The energy installation SNE is based on friendly environmentally photovoltaic battery, rechargeable lead-acid battery and a new predictive controller.

The LiFePO4-electrode process features in Li-ion batteries

Features of lithiated iron phosphate behavior (PH/P1, Phostech Lithium Inc, Canada) used as positive electrode of lithium-ion battery with LiPF6-based electrolyte were investigated. It was shown that lihiated iron phosphate potential does not depend of lithium contents in active material. It was shown that cycle life of the positive electrode strongly depends on charge/discharge current. Fast degradation of the positive electrode takes place at low current rates (0.25 and 0.5C). At the same time degradation is considerably lower at 1 and 2.5C rates.

Current leads corrosion and the problem of diagnostics of fluorocarbon-lithium cells

Corrosion behavior of niobium current leads of fluorocarbon-lithium cells are studied. Polarization measurements at plain niobium leads and at such leads in a contact with fluorocarbon cathode in an electrolyte of fluorocarbon-lithium cell were carried out. Besides, behavior of niobium lead directly in a feedthrough of real cells was studied. The contact of niobium with fluorocarbon cathode is shown to result in toughening of corrosion conditions and in possible niobium depassivation.

Dimorphism of solid electrolytes with own structural disordering

The phenomenological model of transition ``low-conductive phase – electrolytic phase'' in crystals with own structural disordering is offered. The application of this model allowed to describe the behavior of thermodynamical characteristics of such crystals in the transition area and to propose an expression for the baric dependence of transition temperature. Analytical expressions for thermocinetical coefficients and for correlation between electric and thermal conductivity of solid electrolyte are obtained.

Phase diagrams of the ternary systems NaBH4–NaOH–H2O, KBH4–KOH–H2O, NaBO2–NaOH–H2O and KBO2–KOH–H2O by -10°С

A study of the solubility in the ternary systems NaBH4–NaOH–H2O, KBH4–KOH–H2O, NaOH–NaBO2–H2O и KOH–KBO2–H2O is of special fundamental and practical interest. The first two systems are used as a fuel and as a hydrogen source in hydrogen power engineering that includes the low-temperature fuel cells; borohydrides are converted into metaborates. Hence, the last two systems represent the discharged by-product.

Влияние методики синтеза на физико-химические свойства LaLi0.1Со0.1Fe0.8O3-δ

The phase composition, conductivity and corrosion resistance under the Molten Carbonate Fuel Cell (MCFC) operating conditions of synthesized using common ceramic and cocrystallization techniques samples of LaLi0.1Со0.1Fe0.8O3 – δ have been studied. It was found, that the phase composition of synthesized by ceramic technique sample differed from the nominal composition.