Evidence for large hydrogen capacity in single-walled carbon nanotubes encapsulated by thin Pd layers onto a Pd substrate
| Autor: | Andrei Lipson, Boris F. Lyakhov, L. N. Solodkova, E. I. Saunin, A. Yu. Tsivadze |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Hydrogen Mechanical Engineering Composite number chemistry.chemical_element Nanotechnology General Chemistry Carbon nanotube Electrochemistry Electronic Optical and Magnetic Materials law.invention Metal Hydrogen storage Chemical engineering chemistry law visual_art Materials Chemistry visual_art.visual_art_medium Gravimetric analysis Electrical and Electronic Engineering Palladium |
| Zdroj: | Diamond and Related Materials. 18:984-989 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/j.diamond.2008.11.029 |
| Popis: | We report a study of hydrogen storage and its mechanism in a novel material, representing single-walled carbon nanotubes (SWCNTs) encapsulated by thin Pd layers onto a Pd substrate. A synergetic effect resulting in combination of the Pd and the SWCNT properties with regard to hydrogen has been achieved. We showed that adding SWCNTs increases the H 2 -capacity of the Pd–SWCNT composite under electrochemical loading only by up to 25% relative to the Pd metal alone. At the same time, with regard to the added SWCNTs, such synergetic approach (providing high H 2 pressure from highly H-loaded massive Pd substrate into a small fraction of deposited SWCNT) allowed us to achieve a net capacity of 8–12 wt.%. H 2 , thus, bringing a unique chance to study hydrogen storage mechanism in highly H-loaded SWCNT. Using ESR technique it was established that the Pd–C x π-complexes forming at the openings of SWCNTs could be considered as hydrogen adsorption sites, providing both high gravimetric capacity (H/C > 1) and low hydrogen binding energy in the Pd encapsulated SWCNT. |
| Databáze: | OpenAIRE |
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