Fuel cells

Electrochemical oxidation of borohydride-ion on nickel electrode: a study by the method of ir-spectroscopy

The study of the anodic oxidation of borohydride-ion BH4 on catalytically active nickel electrode by methods of potentiostatic inclusion, galvanostatically inclusion, cyclic voltammetry and infrared spectroscopy with Fourier transformation. The composition of some intermediates of the process of electrochemical oxidation of BH4 and the mechanism of decomposition of borohydride, which includes the following basic stages: BH4 → BH3(OH) → BH2(OH)2 → BH(OH)3 → B(OH)4, is determined. The regularities of the kinetics of the electrochemical oxidation of BH4 – ion Ni-electrode is determined. The diffusion coefficient BH4 ion in aqueous solution at a temperature of 25°C, measured by electrochemical methods, ranges from 5.3·10–5 to 1.6·10–5, the average value of 2·10–5 cm2/s.

Catalytic layers on the composites of polymers, carbon nanotubes and adsorbed platinum particles

The composites contained ultra low amounts of platinum, polymers and carbon nanotubes (SWCNTs) were investigated. The main goal were to elucidate the influence of the polymer functional groups nature on the structure and on electrocatalytic activity of the composites. The structure of the composite Platinum/sodium polystyrensulfonate (PSS)/SWCNTs/GC has been studied by TEM, HRSTEM, HAADF STEM and SAED methods. The loading of platinum was detected by ICP–AES. The electrochemical studies show high catalytic activity of the prepared composite in methanol oxidation reaction comparing to commercial catalyst Pt/C ETEK and other previously studied composites.

Catalytic activity of lali0.1co0.1fe0.8o3-d cathode in (Li0.62K0.38)2CO3 melt. Part II. The reaction mechanisms and catalytic activity of the oxide electrode

The oxygen reduction mechanisms on an oxide electrode are proposed. It was found, that in the temperature range 870–1020 K mechanism involving superoxide ions dominates, whereas in T < 870 К region the reaction mechanisms involving molecular oxygen apparently take place.

Catalytic activity of LaLi0.1Co0.1Fe0.8O3-d cathode in (Li0.62K0.38)2CO3 melt. Part I. Experimental results and equivalent circuit for oxide – melt boundary

The results of the study of kinetics of oxygen reduction on the dense LaLi0.1Co0.1Fe0.8O3-d electrode in (Li0.62K0.38)2CO3 eutectic melt using coulostatic technique are reported. It was found, that the equivalent circuit that includes heterogeneous charge transfer step in series with heterogeneous chemical reaction most closely fits the kinetics of electrode processes.