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A comparative research related to hydrogen adsorption capacity of multi wall nanotubes (MWNTs) and poly aniline (PANI) doped with Ruthenium (Ru) was carried out. Carbonic materials are considered to be one of the most promising materials for hydrogen adsorption and storage; they have different applications and fuel cells technology may be considered the most important of them. By using transitional metals for doping carbonic materials, the adsorption capacity. PANI has been prepared and doped in laboratory while MWNT used in experiments have been purchased from the market and afterwards doped in laboratory. The doping procedure consists of a physical-chemical method which involves salts of the metal for doping and the use of ultrasounds in order to activate the substrate by inducing fractures within its internal structure. The adsorption capacity of the carbonic materials, which is a consequence of spill over phenomena, has been determined both by physical adsorption in a PCT Pro- User apparatus and by cyclic voltammetry, using VoltaLab-40 apparatus. Both substrates have been characterized in order to determine their porosity, BET surface and structure. The collected data have been processed by using the PCT Pro-User apparatus's software. The results have been compared with the available data from literature and a good consistency was found. [ABSTRACT FROM AUTHOR]

Fullerenes are considered as a promising material for use as a hydrogen storage. The development of methods of synthesis and purification from impurities has high practical importance. In this report, arc discharge method of synthesis of carbon black containing fullerenes has been developed and purification methods of fullerenes has been optimized. Synthesis of fullerenes was carried out in helium environment. The graphite rods were atomized by electric arc and products were obtained by plasma chemical reactions at the following discharge parameters: p=300 Torr, U=30 V and I=300 A. The extraction of fullerenes from carbon black was carried out by known method of dissolution of carbon black in benzene followed by filtration and drying. The samples obtained were investigated by optical DM 6000M (Leica, Sweden) microscope and Ntegra Spectra scanning probe microscope. The results confirm that the obtained crystals are C60 and C70 crystals of fullerite. In order to conduct the qualitative assessment of the fullerite crystal structure, the Raman signal was accumulated using continuously moving sample, as the prolonged exposure to laser radiation may result in polymerization of fullerenes. [ABSTRACT FROM AUTHOR]