Fuel cells

Research and investigation of catalytic layers of proton-exchange membrane fuel cell

Composition and structure of proton-exchange membrane (PEM) fuel cell catalytic layers were investigated. The maximum FC efficiency was observed at the polymer content in a layer 25-30 vol.% at work on air and 30-35 vol. % at work on oxygen. At a variation of quantity of catalytic composition the maximum current density have been received at layer load 1.75 mg/sm2, thus decrease in it value in 2 times leads to falling of current density only on 10%.

The estimation of perfomanсe of exogenous redox mediators in the bioelectrochemical system glucose–Escherichia coli cells-mediator

The performance of several redox mediators (methylene blue, neutral red. and gallocyanine) in the bioelectrochemical system glucosc- Escherichia coli cells was estimated by means of the rotating disk electrode technique. The diffusion coefficients of the mediators under study were evaluated. Methylene blue and gallocyanine arc shown to be effective reversible electron carriers for the Escherichia coli-based bioanode.

Modelling of chemically induced stresses in tubular membranes with mixed oxygen-ionic and electronic conductivity

By the example of tubular oxygen-permeable membrane of mixed-conducting LaGa0.65Mg0.15Ni0.20O3-Δ operating under oxygen chemical potential gradients in the regime of hydrocarbon oxidation, modeling of chemically induced strains in the dense ceramic material has been carried out. The membranes with various radii in different reactor configurations were simulated. Analysis of the distributions of oxygen chemical activity and chemically induced stresses showed that, for minimization of mechanical stresses, the most advantageous basic configuration involves supplying atmospheric air inside a tubular membrane and opposite directions of the gas flows. The maximum stresses are observed in the region of reducing gas mixture injection, where a zone with an essentially constant oxygen chemical potential on the membrane surface may exist for many reactor configurations. The size of such zones formed due to specific features of the gaseous phase component distribution and/or ceramic reactor configurations, has a significant effect on the mechanical stress distribution.

Oxyge electro-reduction in an acidic electrolyte on the gold nanoparticles–carbon carrier system

The synthesis of catalysts 20 Au/C with different degree of dispersion. These systems were investigated for activity in the oxygen electroreduction reaction with methods of the cyclic voltammograms and polarization curves. The increase of rate and depth of process (the number of electrons increases from 2 to 3.5) in the transition from compact to gold nanoparticles.