Hydrogen absorption and transport in graphite materials

Atsumi, H.; Tauchi, K.

doi:10.1016/s0925-8388(03)00290-1

Cited by 68 publications

(69 citation statements)

References 28 publications

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“…3)) of the crystal lattice of isotropic graphite [43] (Fig. 4a, b), TD peak III) and in some carbon nanostructures with sp 2 hybridization, including nanostructured graphite (Fig.…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

“…Process III [reaction (5)] is characterized [12] by the experimental value [43] of the standard enthalpy of the bulk solution, or the chemisorption of half mole of hydrogen molecules H 2 gas (the initial gaseous state) in the graphite lattice of the material ( H (5)III = -19 ± 1 kJ mol -1 (H) = -0.20 ± 0.01 eV/atom(H)) and the experimental value ( [43,[16][17][18][19] and others [12]) of the effective enthalpy of the bulkdiffusion activation of hydrogen atoms in the graphite lattice, Q III = 250 ± 3 kJ mol -1 (H) = 2.59 ± 0.03 eV/atom(H). The graphite quantities of H (5)III and Q III are related and close to the aforementioned (in Section 2) graphane quantities of H 0 f(theor.)…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

“…Taking into account the experimental data [43] and some others (review [12]), we can approximate the mass action law for the reaction (5) as…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

“…(4). Experimental curves of the temperature-programmed desorption (TD-peaks or TD-spectrum) of deuterium and the fitting curves for carbon materials: (a) ISO-88 isotropic graphite deuterium-saturated (in D 2(gas) ) in the course of 5 hours at 973 K and 60 kPa, [43]; (b) ISO-88 isotropic graphite after irradiation by 20 keV ions of D 2 with the dose 5·10 23 m -2 , [43]; (c) -nanostructured graphite (by mechanical synthesis with D 2(gas) in a ball mill for 80 hours at 1 MPa and 300 K), [44]. The thermodesorption activation energies are shown: 1.3 eV for TD-peak II, 2.6 eV for TD-peak III, and about 4.4 eV for TD-peak IV [12].…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

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The High-Density Hydrogen Carrier Intercalation in Graphane-Like Nanostructures, Relevance to its On-Board Storage in Fuel-Cell-Powered Vehicles

Nechaev¹

2011

TOFCJ

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Theoretical (thermodynamic) and experimental backgrounds are considered for developing a much simpler, more technological and effective method (in comparison with the known megabar compression dynamic and static methods) of producing a high-density solid molecular ("reversible") hydrogen carrier by means of hydrogen intercalation (at the cost of the hydrogen association energy) in carbonaceous nanomaterials (between graphane-like layers) at relevant temperatures and pressures. As is shown, one of the processes of chemisorption of hydrogen in carbonaceous nanomaterials may be related to formation of graphane-like (carbohydride-like) complexes and/or multilayer graphane-like nanostructures. In this connection, some aspects of the graphene/graphane problem are considered, as well. By using gravimetric and electron microscopy data, the density values ( H = 0.7±0.2 g(H 2 )/ 3 (H 2 ), and * H = 0.28±0.08 g(H 2 )/ 3 (system) -the "volumetric" capacity) of the intercalated solid molecular ("reversible") hydrogen (of a high purity) in graphane-like nanofibers ( 15 mass % H 2 -the "gravimetric" capacity) have been defined. It is a much more acceptable, safe and efficient technology, in comparison with the current technologies of composite vessels with high hydrogen pressure (about 80 MPa) and the current space cryogenic technologies of hydrogen on-board storage in fuel-cell-powered vehicles. It exceeds and/or corresponds to the known U.S. DOE requirements-targets for 2015, with respect to the hydrogen capacities, safety, reversibility and puirity.Keywords: Carbon-based nanomaterials, High-density solid molecular reversible hydrogen carrier, Graphane-like (carbohydride) multilayer nanostructures, Graphene/graphane problem, Hydrogen on-board efficient and safety storage.

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“…3)) of the crystal lattice of isotropic graphite [43] (Fig. 4a, b), TD peak III) and in some carbon nanostructures with sp 2 hybridization, including nanostructured graphite (Fig.…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

“…Taking into account the experimental data [43] and some others (review [12]), we can approximate the mass action law for the reaction (5) as…”

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

Section: About Graphane-like Regions (Centers) In Graphite and Some Cmentioning

confidence: 99%

See 2 more Smart Citations

The High-Density Hydrogen Carrier Intercalation in Graphane-Like Nanostructures, Relevance to its On-Board Storage in Fuel-Cell-Powered Vehicles

Nechaev¹

2011

TOFCJ

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show abstract

“…2 .°AEÐËÏ ËÊ ÒÓÑÙÇÔÔÑÄ, ÔÑÒÑÔÕÂÄËÏÞØ Ô ÒÓÑÙÇÔÔÑÏ (i) Ä [27], âÄÎâÇÕÔâ ÓÂÔÔÏÑÕÓÇÐÐÂâ Ä [10,17] (ÒÓÑÙÇÔÔ III) AEËÔÔÑÙËÂÕËÄÐÂâ ØËÏËÚÇÔÍÂâ ÂÃÔÑÓÃÙËâ ÄÑAEÑÓÑAEÂ (H gas 2 ) Ä ÅÓÂ×ÇÐÑÄÞØ ÔÎÑâØ ÍÓËÔÕÂÎÎËÚÇÔÍÑÌ ÓÇÛÇÕÍË ËÊÑÕÓÑÒÐÑÅÑ ÅÓÂ×ËÕÂ [51,53] (ÓËÔ. 5, 7Â,´±¥-ÒËÍ III) Ë ÓÑAEÔÕÄÇÐÐÞØ ÖÅÎÇÓÑAEÐÞØ ÐÂÐÑÔÕÓÖÍÕÖÓ Ô sp 2 ÅËÃÓËAEËÊÂÙËÇÌ, Ä ÕÑÏ ÚËÔÎÇ Ä ÅÓÂ×ËÕÑÄÞØ ÐÂÐÑÄÑÎÑÍÐÂØ [12] (ÓËÔ.…”

Section: ¥ëôôñùëâõëäðââ øçïñôñóãùëâ äñAeñóñaeâ 321 ±óñùçôô IIImentioning

confidence: 99%