Водородная энергетика

The results of protons diffusion mathematical modeling in the crystalline lattice of NiOOH/ Ni(OH)₂ are caparisoned with data of experiments on thin (100 μm) porous electrodes. The criterion of nickel hydroxide activity is offered as product of proton diffusion coefficient in the crystalline lattice of NiOOH on the square of specific surface area. It was founded existence of protons migration mechanism in a crystalline lattice under action electric field.

Comparative results of capacity renewal of sealed nickel-cadmium batteries with asymmetric and direct currents after their long-term storage are represented. Capacity renewal with asymmetric current was carried out in an accelerated manner at average value of the charging current equal to 0,25C_rated. Capacity renewal with direct current was carried out at average value of the charging current equal to 0,1C_rated in accordance with Technical Conditions.

The results of nickel cadmium accumulators (NCA) formation with the asymmetric and constant currents are represented. Accumulators formation with the asymmetric current allowed to reduce one-half the time of technological cycle of placing these accumulators in service, comparing with the constant current mode, with maintenance of their operational characteristics. Comparative characteristics of NCA operational parameters are given.

The research results of the sealed lead-acid (SLA) batteries of domestic and foreign production are considered. The effect of temperature on the SLA batteries operational performances was investigated. The relationship between the open-curcuit voltage (OCV) and the SLA battery stage-of-charge as well as the relationship between the open-curcuit voltage (OCV) and the battery impedance were determined. The high accuracy of the stage-of-charge diagnosis method based on the battery OCV measuring was proven.

This article is dedicated to the investigation of sulfatation process of negative active mass. The authors showed a dependence of sulfatation degree of lead electrode from time of keeping in discharged station. It was studied the influence of addition of ammonium sulfate on desulfatation process.

Computer modelling of the mechanical stress state originating at manufacturing and heating to a working temperature of cells of the SOFC of a tubular design with classical functional materials (Ni-YSZ)/YSZ/LSM is developed. Electrolyte-supported and anode-supported cells are observed, and also the residual stresses originating by manufacture of the module a cone-cone with direct anode-cathode contact are simulated. Simulation of process of manufacturing anode-supported cells display that there is no the stress, able to lead to cell rupture.

The effect of electrolyte humidity on charge-discharge behavior of electrodes from graphite, thin-film amorphous silicon and thin-film composites ``silicon–carbon'' is estimated. Rise of humidity from 50 to 400 ppm is shown to accelerating capacity fade of graphite electrode by order of the magnitude. Electrode with 0.2 μm amorphous silicon film keeps the cyclability in electrolytes with water content up to 3000 ppm however its capacity diminishes upon humidity increase.

The additive into electrolyte SO₂ allowing to realize the intercalation of lithium ions into spectral-pure graphite is shown in the work given. The monolayer of SO₂ restoration products possessing the properties of solid inter phase electrolyte is formed on the material given. The formation of the surface layer requires 160±15 mA·h/g.

Pathbreaking studies of electrochemical graphite bisulphate synthesis from artificial graphite produced from hydrolyzed lignin and further production of high quality thermal expanded graphite are described. The studies show that any oxidation level can be achieved as well as over oxidized graphite may be produced at graphite bisulphate synthesis. Parameters of graphite bisulphate synthesis and thermal expanded graphite parameters are close to those of graphite bisulphate and thermal expanded graphite produced from natural graphite's.

The electrochemical and electrocatalitical properties complexes on the paraphenilendiamine basis investigating in alkaline solution by cyclicvoltammetry method. Was determined redox potentials connected with the transformation the compounds-making ion and organic ligand. Stating the value of electrocatalytic activity in molecular oxygen electroreduction.