Comparison of hydrogen adsorption abilities of platinum-loaded carbon fibers prepared using two different methods

Ozaki, Jun‐ichi; Ohizumi, W.; Ōya, Asao; Illán-Gómez, M.J.; Román-Martı́nez, M.C.; Linares-Solano, Á.

doi:10.1016/s0008-6223(00)00033-6

Cited by 22 publications

(18 citation statements)

References 12 publications

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“…This result highlights the difference between assessing hydrogen uptake in terms of H:M versus weight percent. Comparison of the results here to similar hydrogen spillover experiments with platinum-loaded carbon fibers show that the reflux doping method is promising in terms of H:M T ratios [23]. However, the metal content was not easily controlled for the reflux doping, and the metal content measured by neutron activation analysis indicated that not all of the added metal ended up on the surface of the carbon (Table 2).…”

Section: Primary Spillover: Optimization Of a Catalyst-carbon Systemmentioning

confidence: 59%

Hydrogen spillover to enhance hydrogen storage—study of the effect of carbon physicochemical properties

Lueking

Yang

2004

Applied Catalysis A: General

302

198

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Hydrogen storage in carbon materials can be increased by hydrogen spillover from a supported catalyst; a systematic investigation of various carbon supports was used to better understand how hydrogen spillover affects hydrogen storage on carbon materials. Secondary spillover experiments effectively eliminated experimental variables associated with primary spillover, evidenced by materials clustering around the carbon type for a variety of supported catalyst-carbon mixtures. Providing a supported catalyst to act as a hydrogen source enhances the overall hydrogen uptake of a carbon material; for example, simple mixing of carbon nanotubes with supported palladium increased the uptake of the carbons by a factor of three. However, the baseline adsorption of the carbon was the predominant factor in the magnitude of the overall hydrogen uptake, even when hydrogen spillover was active. Three observations illustrated that a dynamic steady-state model is needed for predictive capacity of hydrogen spillover.

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Section: Primary Spillover: Optimization Of a Catalyst-carbon Systemmentioning

confidence: 59%

Hydrogen spillover to enhance hydrogen storage—study of the effect of carbon physicochemical properties

Lueking

Yang

2004

Applied Catalysis A: General

302

198

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“…Further, since the dissociation energy of hydrogen is too high (440 kJ/mol H 2 ), the occurrence of chemical adsorption is limited under these special environments. However, it is known that a minor amount of a catalytic metal such as Pd and Pt in carbon could dissociate hydrogen molecules to hydrogen atoms [31], thereby helps in enhancing the chemisorptions of hydrogen at moderate conditions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of nanocrystalline Pt dispersed multi-walled carbon nanotubes

Reddy

Ramaprabhu

2007

International Journal of Hydrogen Energy

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“…In recent years, carbon materials such as carbon nanotubes (CNTs), carbon nanofibers and mechanically milled graphites have attracted attention owing to the availability of new carbon materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. However, most studies concerning the hydrogen storage have been carried out at high pressures (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) and low temperatures (80-133 K) in order to store molecular hydrogen by physisorption. It has been often reported that hydrogen storage by physisorption remains less than 4 wt% at room temperature and even high pressures [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Our methodology here of the hydrogen storage is to adsorb atomic hydrogen at the defect sites of CNTs after dissociation of H 2 by Pd catalyst particles attached to the CNTs [15][16][17]. La catalysts have been doped to CNTs in order to introduce the defect sites [17], which catalyze oxidation of CNTs by O 2 .…”

Section: Introductionmentioning

confidence: 99%

Possibilities of atomic hydrogen storage by carbon nanotubes or graphite materials

Yoo

Habe

Nakamura³

2005

Science and Technology of Advanced Materials

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Atomic hydrogen storage by carbon nanotubes (CNTs) and highly oriented pyrolytic graphite (HOPG) has been studied using a flow catalytic reactor and an ultra-high vacuum surface science apparatus including scanning tunneling microscope (STM), respectively. Defect sites on CNTs as adsorption sites of atomic hydrogen are introduced by oxidation pretreatment using La catalyst. Pd catalysts are then deposited on CNT surfaces for dissociation of H 2 into atomic hydrogen, which spills over to the defect sites. In the best case, 1.5 wt% of hydrogen is stored in the defective CNT with Pd particles at 1 atm and 573 K. In temperature programmed desorption (TPD) experiments, H 2 starts to desorb at 700-900 K depending on the annealing temperatures of CNTs prior to hydrogen storage. On the HOPG surface, hot atomic hydrogen produced by dissociation of H 2 using tungsten wire desorbs from graphite terraces at 400-700 K, which is much lower than that on CNTs. It is possible that one can decrease the desorption temperature by changing the method of H 2 dissociation. q

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Comparison of hydrogen adsorption abilities of platinum-loaded carbon fibers prepared using two different methods

Cited by 22 publications

References 12 publications

Hydrogen spillover to enhance hydrogen storage—study of the effect of carbon physicochemical properties

Hydrogen spillover to enhance hydrogen storage—study of the effect of carbon physicochemical properties

Hydrogen storage properties of nanocrystalline Pt dispersed multi-walled carbon nanotubes

Possibilities of atomic hydrogen storage by carbon nanotubes or graphite materials

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