A study of hydrogenated carbon fibers by scanning electron microscopy and confocal laser scanning microscopy |
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| Authors: | Antonio Madroñero De La Cal Juan Aguado-Serrano Maria Luisa Rojas-Cervantes Elena V. Rosa Adame Belen Sarmiento Marron Africa Castro Rosende Roman Nevshupa |
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| Affiliation: | 1. CENIM, Consejo Superior de Investigaciones Científicas, Madrid, Spain;2. Department of Inorganic and Technical Chemistry, Faculty of Sciences, UNED, Madrid, Spain;3. Hynergreen, Seville, Spain;4. ICMM, Consejo Superior de Investigaciones Científicas, Cantoblanco, Madrid, Spain |
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| Abstract: | The hydrogen absorption process is studied in carbonaceous fibers produced from a mixture of methane and hydrogen. The absorption of the hydrogen was examined in two types of fibers, in “as-grown” state and after a process of desorption during an annealing to 1.473 K under vacuum. Later to its production process, the fibers withstand an oxidation in air to 973 K. The fibers were examined by means of scanning electron microscopy (SEM) and confocal microscopy by reflection. Differences in the behavior during the oxidation were observed between the fibers in as-grown state and those subjected to a further annealing. It could be verified that the fibers were really constituted by two different phases. In one of the phases, the storage of the hydrogen absorbed took place, whereas in the other phase there was no alteration. The process of annealing prior to the absorption of the hydrogen has an appreciable effect on the desorption rate of the hydrogen. Microsc. Res. Tech., 2009. © 2009 Wiley-Liss, Inc. |
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| Keywords: | hydrogen adsorption pitting oxidation laser confocal microscopy hydrogen storage carbonaceous fibers |
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