Transport properties of H2 confined in carbide-derived carbons with different pore shapes and sizes
| Autor: | Jan Peter Embs, Riinu Härmas, Enn Lust, Margarita Russina, Veronika Grzimek, Indrek Tallo, Miriam Koppel, Heisi Kurig, Ove Oll, Eneli Härk, Rasmus Palm, Maarja Paalo |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Diffusion chemistry.chemical_element 02 engineering and technology General Chemistry Neutron scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Carbide Adsorption chemistry Chemical engineering General Materials Science Nanometre 0210 nano-technology Mesoporous material Carbon |
| Zdroj: | Carbon. 155:122-128 |
| ISSN: | 0008-6223 |
| Popis: | Hydrogen adsorption in highly porous carbon with well-defined pores, with three different shapes, and different sizes ranging from sub-to nanometers is investigated. Using a combined approach of volumetric gas adsorption method and in-situ quasi-elastic neutron scattering method the relationship between final macroscopic intake properties, details of the local adsorbent structure and the molecular behaviour of confined hydrogen are established. It is shown that sub-nanometer pores of spherical and cylindrical shape strongly limit the diffusion of H2, and thus, enhance the H2 storage capability of carbons with well-tailored pore structure. In mesoporous carbide-derived carbon, the formation of a hydrogen layer with reduced mobility close to the pore walls is observed. With the increase in the amount of confined hydrogen and the occupation of the centre pore area, the mobility of confined hydrogen increases in a jump–like fashion. Surprisingly, the increase of hydrogen diffusion is also observed at higher hydrogen loadings, indicating that cooperative H2–H2 interactions might play a role. |
| Databáze: | OpenAIRE |
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