Objective
Nanostructured carbon materials essentially composed of nanotubes, capsules or clusters with nanopores are presently the subject of a large deal of scientific research because of their unique prospects for electronic nanotechnology and engineering. This project is concerned with a little explored family of bulk nanoporous carbon materials (NPCM) produced by selective etching redox reactions from metal (Ti, Mo), silicon or boron carbides. The NPCM solid systems show a high degree of size homogeneity of nanopores, with the typical size 1 - 2 nm controlled by appropriate choosing the initial carbide. In the project, advantage is taken of the opportunity to impregnate the NPCM skeletons with guest materials, providing a means for generating a family of novel nanocomposites with new properties. The principal goal of the project is to synthesise the NPCM-based nanocomposites impregnated with metals (K, Li, Ni, Co) or non-metals (S, Se, Br) and to study their structural, physico-chemical and physical properties.
The technological problems to be solved will be reduced to:
(i)optimisation of the procedures of the NPCM hosts fabrication from the initial carbides and;
(ii) elaboration of efficient impregnation methods and conditions suitable for each of the selected guests.
In particular, the gas transport reactions, electrochemical processes and capillary or high-pressure-assisted filling of the pores with precursors followed by in-pore chemical reactions of reduction will be examined as impregnation procedures. Structural characterisation of the NPCM-based nanomaterials over a wide length scale range from tenths to hundreds nanometers will be carried out in the project by using a large number of complementary experimental techniques. As a result, the data on the nanopore and nanocluster parameters, short-range ordering, atomic vibrations, electronic hybridisation and chemical bonding will be obtained. Special attention will be given to the problem of host - guest interaction due to physical or chemical adsorption or diffusion of the dopants. The properties of highly developed pore surface, the adsorption activity, the effects of adsorbates from atmosphere and the character of fitting of the guests in the NPCM hosts will be considered. The possibility of intercalation processes or formation of 3D arrays of guest nanoclusters will be clarified.
In the project, the charge and heat transport properties of the NPCM-based nanocomposites will be studied by measuring electric and thermal conductivity, heat capacity, and thermoelectric and galvanomagnetic phenomena over wide range of temperatures and magnetic fields. The results will be analysed in the framework of present-day theoretical treatments for size-confined systems. In parallel, the localised defect or interface states, which can essentially modify the guest effects upon the charge carrier behaviour, will be studied. For the nanomaterials impregnated with transition metals, the magnetic and galvanomagnetic properties controlled by collective interactions in the host - guest system will be investigated. In this case the effect of giant magnetoresistance can be expected.
The comprehensive research activities to be executed in the project will provide considerable information which will form the scientific basis for applications of the NPCM-based nanocomposites produced from carbides. In this connection, particular emphasis will be placed on the electrochemical studies of nanomaterial electrode - aprotic organic electrolyte systems and search for the optimal systems for double-layer supercapacitors. The strongly developed carbon skeleton surface and high open nanoporosity favourable to intercalation make the nanomaterials attractive as anode materials in Li ionic batteries. The charge - discharge behaviour of Li-impregnated nanocomposites in electrochemical cells at different currents will be studied. The data on the capacities, reversible-to-irreversible capacity relationship, charge - discharge hysteresis will be obtained to analyse the prospects of the NPCM-based nanomaterials for energy storage devices.
Fields of science (EuroSciVoc)
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Funding Scheme
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Coordinator
106 91 Stockholm
Sweden
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.