Hydrogen adsorption on carbon materials

Strobel, Reto; Jörissen, Ludwig; Schliermann, Thomas; Trapp, Victor; Schütz, W.; Bohmhammel, K.; Wolf, G.; Garche, Jürgen

doi:10.1016/s0378-7753(99)00320-1

Cited by 226 publications

(105 citation statements)

References 4 publications

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“…It is also known that BET surface areas in the range 3000-3500 m 2 /g can be achieved for some activated carbons. [16,17,27] High surface area of KOH-activated samples has been attributed to the high density of holes in graphene sheets that was confirmed, among other methods, by direct electron microscopy observations. [24,25] These experimental results provide evidence that the surface area of perforated graphenerelated materials can exceed the maximal theoretical value reported for defect-free graphene, thus providing promise for better hydrogen adsorption.…”

Section: Introductionmentioning

confidence: 75%

Hydrogen adsorption by perforated graphene

Baburin

Klechikov

Mercier

et al. 2015

International Journal of Hydrogen Energy

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We performed a combined theoretical and experimental study of hydrogen adsorption in graphene systems with defect-induced additional porosity. It is demonstrated that perforation of graphene sheets results in increase of theoretically possible surface areas beyond the limits of ideal defect-free graphene (~2700 m 2 /g) with the values approaching ~5000 m 2 /g. This in turn implies promising hydrogen storage capacities up to 6.5 wt% at 77 K, estimated from classical Grand canonical Monte Carlo simulations. Hydrogen sorption was studied for the samples of defected graphene with surface area of ~2900 m 2 /g prepared using exfoliation of graphite oxide followed by KOH activation. The BET surface area of studied samples thus exceeded the value of single-layered graphene. Hydrogen uptake measured at 77 K and 296 K amounts to 5.5 wt% (30 bar) and to 0.89 wt% (120 bar), respectively.

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Section: Introductionmentioning

confidence: 75%

Hydrogen adsorption by perforated graphene

Baburin

Klechikov

Mercier

et al. 2015

International Journal of Hydrogen Energy

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“…Since then, numerous investigations have demonstrated that activated carbon can store 4 to 6 wt pct hydrogen at moderately low pressures (~40 bar) and cryogenic temperatures (~77 K [~À196°C]) (e.g., see the reviews by Dillon and Heben, [109] Be´nard and Chahine, [110] Poirier et al, [111] Carpetis and Peschka, [112] Hynek et al, [113] and the work by Schwarz et al [114,115] However, work by Stro¨bel and colleagues show that only~1.6 wt pct hydrogen storage has been measured for activated/ porous carbons at ambient temperatures, even with pressures up to 125 atm. [116] It should be noted that typical hydrogen storage values at ambient temperatures of activated carbons are significantly lower. Carpetis, and Peschka and others have suggested that activated carbons may be used to inexpensively store hydrogen at cryogenic temperatures.…”

Section: Hydrogen Sorption Center Of Excellence (Hscoe)mentioning

confidence: 99%

Accelerating the Understanding and Development of Hydrogen Storage Materials: A Review of the Five-Year Efforts of the Three DOE Hydrogen Storage Materials Centers of Excellence

Klebanoff

Ott

Simpson

et al. 2014

Metallurgical and Materials Transactions E

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A technical review of the progress achieved in hydrogen storage materials development through the U.S. Department of Energy's (DOE) Fuel Cell Technologies Office and the three Hydrogen Storage Materials Centers of Excellence (CoEs), which ran from 2005 to 2010 is presented. The three CoEs were created to develop reversible metal hydrides, chemical hydrogen storage materials, and high-specific-surface-area (SSA) hydrogen sorbents. For each CoE, the approach taken is specified, key outcomes and accomplishments identified, and recommendations for future work are suggested. The Metal Hydride Center of Excellence addresses work on destabilized hydrides, including the LiBH/Mg 2 NiH 4 system, borohydrides, amides, and alanes; and compares the best materials to DOE targets. The Chemical Hydrogen Storage Center of Excellence discusses the classes of materials studied for chemical hydrogen storage, focusing on ammonia borane and examines the progress in developing efficient regeneration schemes. The Hydrogen Sorption Center of Excellence describes the progress in developing high-SSA sorbents and pathways for developing improved materials capable of achieving DOE targets. The phenomenon of spillover is also observed and its importance to ensuring improved measurements is discussed. Through the five-year effort of the Hydrogen Storage Materials Centers of Excellence, significant progress was achieved in developing and understanding hydrogen storage materials.

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“…Without doubt, the simplest and mostly used concept of gravimetric adsorption excess gives comparable results among most of the authors. However, despite the general agreement among scientists in the field [6,[25][26][27][28], an example of a misleading concept is the overestimation of the gravimetric excess adsorption by leaving out the addend n exc ·M in the denominator of Equation 1. Thereby, the sample's weight gain due to the adsorbed gas is disregarded, which leads to "g adsorbate /g adsorbent " instead of "wt.%".…”

Section: Equationsmentioning

confidence: 99%

Adsorbent density impact on gas storage capacities

Kunowsky¹,

Suárez-Garcı́a²,

Linares‐Solano³

2013

Microporous and Mesoporous Materials

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In the literature, different approaches, terminologies, concepts and equations are used for calculating gas storage capacities. Very often, these approaches are not well defined, used and/or determined, giving rise to significant misconceptions. Even more, some of these approaches, very much associated with the type of adsorbent material used (e.g., porous carbons or new materials such as COFs and MOFs), impede a suitable comparison of their performances for gas storage applications. We review and present the set of equations used to assess the total storage capacity for which, contrarily to the absolute adsorption assessment, all its experimental variables can be determined experimentally without assumptions, ensuring the comparison of different porous storage materials for practical application. These materialbased total storage capacities are calculated by taking into account the excess adsorption, the bulk density (ρ bulk ) and the true density (ρ true ) of the adsorbent. The impact of the material densities on the results are investigated for an exemplary hydrogen isotherm obtained at room temperature and up * Tel.: +34 965 90 93 50; Fax: +34 965 90 34 54.Email address: kunowsky@ua.es (Mirko Kunowsky) February 5, 2013 to 20 MPa. It turns out that the total storage capacity on a volumetric basis, which increases with both, ρ bulk and ρ true , is the most appropriate tool for comparing the performance of storage materials. However, the use of the total storage capacities on a gravimetric basis cannot be recommended, because low material bulk densities could lead to unrealistically high gravimetric values. Preprint submitted to Microporous and Mesoporous Materials

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Hydrogen adsorption on carbon materials

Cited by 226 publications

References 4 publications

Hydrogen adsorption by perforated graphene

Hydrogen adsorption by perforated graphene

Accelerating the Understanding and Development of Hydrogen Storage Materials: A Review of the Five-Year Efforts of the Three DOE Hydrogen Storage Materials Centers of Excellence

Adsorbent density impact on gas storage capacities

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