Comment to the “Response to “Hydrogen adsorption in Pt catalyst/MOF-5 materials”” by Li et al.

Luzan, Serhiy M.; Talyzin, Alexandr V.

doi:10.1016/j.micromeso.2010.10.005

Cited by 16 publications

(6 citation statements)

References 22 publications

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“…Recently, Luzan and Talyzin and Hirscher c.s. , claimed that the spillover effect from Pt/C catalyst to MOF is below the detection limit. In reply, Yang and co-workers noted that the methodology to maximize spillover is still an art and that spillover depends on many experimental factors. , Luzan and Talyzin repudiated, however, that such factors could explain the absence of spillover in their experiments with Pt/MOF-5 materials …”

Section: Spillover For Hydrogen Storagementioning

confidence: 98%

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Hydrogen Spillover. Facts and Fiction

2012

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Section: Spillover For Hydrogen Storagementioning

confidence: 98%

“…110,111 Luzan and Talyzin repudiated, however, that such factors could explain the absence of spillover in their experiments with Pt/ MOF-5 materials. 112 6. SPILLOVER ONTO ZnO AND ZrO 2 .…”

Section: Spillover To Mofsmentioning

confidence: 99%

Hydrogen Spillover. Facts and Fiction

2012

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“…137,149 Many of the previous reports of high capacities in spillover materials ultimately could not be reproduced, leading to an extended debate in the literature concerning several of the assumptions that drove research on these materials around the time of the HSCoE report. 121,[150][151][152][153][154][155][156] Consequently, spillover materials are no longer a significant focus of hydrogen storage materials research.…”

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confidence: 99%

An assessment of strategies for the development of solid-state adsorbents for vehicular hydrogen storage

Allendorf

Hulvey

Gennett

et al. 2018

Energy Environ. Sci.

228

187

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Nanoporous adsorbents are a diverse category of solid-state materials that hold considerable promise for vehicular hydrogen storage. Although impressive storage capacities have been demonstrated for several materials, particularly at cryogenic temperatures, materials meeting all of the targets established by the U.S. Department of Energy have yet to be identified. In this Perspective, we provide an overview of the major known and proposed strategies for hydrogen adsorbents, with the aim of guiding ongoing research as well as future new storage concepts. The discussion of each strategy includes current relevant literature, strengths and weaknesses, and outstanding challenges that preclude implementation. We consider in particular metal-organic frameworks (MOFs), including surface area/volume tailoring, open metal sites, and the binding of multiple H 2 molecules to a single metal site. Two related classes of porous framework materials, covalent organic frameworks (COFs) and porous aromatic frameworks (PAFs), are also discussed, as are graphene and graphene oxide and doped porous carbons. We additionally introduce criteria for evaluating the merits of a particular materials design strategy. Computation has become an important tool in the discovery of new storage materials, and a brief introduction to the benefits and limitations of computational predictions of H 2 physisorption is therefore presented. Finally, considerations for the synthesis and characterization of hydrogen storage adsorbents are discussed. IntroductionStorage of hydrogen with sufficient gravimetric and volumetric capacity for vehicular use remains a significant obstacle to the widespread adoption of hydrogen fuel cell electric vehicles (FCEVs). Several FCEV models are now commercially available in limited locations around the world, and in these vehicles hydrogen is stored as a gas at room temperature with a fill Table 1 along with the current performance of 700 bar systems. These values pertain to the entire storage system, which includes the mass and volume of hydrogen in addition to the tank and associated balance-ofplant (BOP) components. Notably, it is physically impossible to meet the 2025 and ultimate volumetric capacity target with pressurized gas, as the density of H 2 gas at 700 bar and room temperature is just 40 g L À1 without accounting for the BOP.The search for solid-state H 2 storage materials that can supplant compressed gas systems has been ongoing for at least two decades. The development of a viable storage material Broader contextThe widespread use of hydrogen as a clean, sustainable energy carrier has the potential to provide several significant benefits, including a reduction in oil dependency and emissions, improved energy security and grid resiliency, and substantial economic opportunities across many sectors. Hydrogen-fueled vehicles are already appearing internationally, and one of the critical enabling technologies for increasing their availability is on-board hydrogen storage. Stakeholders in developing a hydrogen in...

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“…Some experimentalists have found it difficult to repeat these results. For example, Luzan and Talyzin , and Hirscher , have reported difficulty in reproducing the results of Yang et al Li and Yang have written that creation of these bridged IRMOF-8 samples remains an art . We are convinced that the results of Li and Yang are correct but are difficult to reproduce.…”

Section: Introductionmentioning

confidence: 89%

Energetics and Thermodynamics of the Initial Stages of Hydrogen Storage by Spillover on Prototypical Metal–Organic Framework and Covalent–Organic Framework Materials

Ganz

Dornfeld

2014

J. Phys. Chem. C

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We study the energetics and thermodynamics of the initial stages of hydrogen storage by spillover on prototypical metal−organic framework (MOF) and covalent−organic framework (COF) materials. We use density functional theory on periodic frameworks to achieve reliable and accurate predictions for these materials. For pure IRMOF-1, it has been suggested that there is an enthalpy barrier to the addition of the first hydrogen per benzene and that this barrier is removed by hole doping. We do not observe this enthalpy barrier. However, we do observe that the binding energy for the first hydrogen is unfavorable and creates a kinetic barrier without hole doping. Therefore, hole doping by Zn vacancies or other means is still necessary for the hydrogen storage process to proceed. We observe that the optical absorption for the Zn vacancy model is different from that of the pure model; therefore, the presence of Zn vacancies could be experimentally tested. For COF-5, we find that the energy barrier is not resolved by doping. This may explain why it has been difficult to achieve significant hydrogen spillover on COF materials.

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Comment to the “Response to “Hydrogen adsorption in Pt catalyst/MOF-5 materials”” by Li et al.

Cited by 16 publications

References 22 publications

Hydrogen Spillover. Facts and Fiction

Hydrogen Spillover. Facts and Fiction

An assessment of strategies for the development of solid-state adsorbents for vehicular hydrogen storage

Energetics and Thermodynamics of the Initial Stages of Hydrogen Storage by Spillover on Prototypical Metal–Organic Framework and Covalent–Organic Framework Materials

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