Nanoconfinement degradation in NaAlH4/CMK-1

Chumphongphan, Somwan; Filsø, Uffe; Paskevicius, Mark; Sheppard, Drew A.; Buckley, Craig E.

doi:10.1016/j.ijhydene.2014.05.087

Cited by 33 publications

(24 citation statements)

References 46 publications

(50 reference statements)

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“…Insight into the cycling of nanoconfined NaAlH 4 is slowly emerging. Upon decomposition of NaAlH 4 , large Al crystallites are observed, which are expelled from the nanopores [166,167]. This is not unexpected, as Al has a much larger surface energy than the NaAlH 4 and does not wet the carbon matrix well.…”

Section: Impact Of Confinement On Hydrogen Release and Reversibilitymentioning

confidence: 91%

Complex and liquid hydrides for energy storage

et al. 2016

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The research on complex hydrides for hydrogen storage was initiated by the discovery of Ti as a hydrogen sorption catalyst in NaAlH 4 by Boris Bogdanovic in 1996. A large number of new complex hydride materials in various forms and combinations have been synthesized and characterized, and the knowledge regarding the properties of complex hydrides and the synthesis methods has grown enormously since then. A significant portion of the research groups active in the field of complex hydrides is collaborators in the International Energy Agreement Task 32. This paper reports about the important issues in the field of complex hydride research, i.e. the synthesis of borohydrides, the thermodynamics of complex hydrides, the effects of size and confinement, the hydrogen sorption mechanism and the complex hydride composites as well as the properties of liquid complex hydrides. This paper is the result of the collaboration of several groups and is an excellent summary of the recent achievements.

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Section: Impact Of Confinement On Hydrogen Release and Reversibilitymentioning

confidence: 91%

Complex and liquid hydrides for energy storage

et al. 2016

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“…Nanoparticles have a well-known tendency to grow to larger particles. Previous work demonstrates that sodium alanate, NaAlH 4 , prefers to crystallise in the larger pores in CA scaffolds [26], and may also migrate out of the scaffold upon cycling [40].…”

Section: Samplementioning

confidence: 99%

Hydrogen Storage Stability of Nanoconfined MgH2 upon Cycling

et al. 2017

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It is of utmost importance to optimise and stabilise hydrogen storage capacity during multiple cycles of hydrogen release and uptake to realise a hydrogen-based energy system. Here, the direct solvent-based synthesis of magnesium hydride, MgH 2 , from dibutyl magnesium, MgBu 2 , in four different carbon aerogels with different porosities, i.e., pore sizes, 15 < D avg < 26 nm, surface area 800 < S BET < 2100 m 2 /g, and total pore volume, 1.3 < V tot < 2.5 cm 3 /g, is investigated. Three independent infiltrations of MgBu 2 , each with three individual hydrogenations, are conducted for each scaffold. The volumetric and gravimetric loading of MgH 2 is in the range 17 to 20 vol % and 24 to 40 wt %, which is only slightly larger as compared to the first infiltration assigned to the large difference in molar volume of MgH 2 and MgBu 2 . Despite the rigorous infiltration and sample preparation techniques, particular issues are highlighted relating to the presence of unwanted gaseous by-products, Mg/MgH 2 containment within the scaffold, and the purity of the carbon aerogel scaffold. The results presented provide a research path for future researchers to improve the nanoconfinement process for hydrogen storage applications.

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“…Carbonization experiments were performed with sucrose, sulfuric acid, and various amounts of pyrrole. Typically, the synthesis of NMK-1-x involved dissolution of 1.25 g sucrose, 0.2-1.2 g pyrrole, and 0.14 g H 2 SO 4 in 5.0 g H 2 O; this solution was then combined with 1 g MCM-48 [19,22]. The sucrose solution corresponded approximately to the maximum amount of sucrose and sulfuric acid that could be contained in the pores of 1 g MCM-48.…”

Section: Investigation Of Carbon Dioxide Adsorption By Nitrogen-dopedmentioning

confidence: 99%

“…Currently, there is significant interest in the development of solid carbon adsorbents that are capable of selectively adsorbing CO 2 , because of their large surface area, porosity, abundance, cost efficiency, low density, fast adsorption kinetics, and high chemical and thermal stability [15][16][17][18]. Furthermore, these materials offer some advantages in terms of ease of handing, pore structure, and surface characteristics, as well as low-regeneration energy [19]. Therefore, carbon materials are currently considered attractive candidate sorbents for CO 2 capture in the development of alternate clean and sustainable energy technologies.…”

mentioning

confidence: 99%

Investigation of carbon dioxide adsorption by nitrogen-doped carbons synthesized from cubic MCM-48 mesoporous silica

Heo¹,

T²,

Park³

2016

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Carbon dioxide (CO 2 ) is a component of the flue gas of power plants and automobile emissions. This gas is recognized as a primary greenhouse gas and is a presumed agent of climate change [1,2]. The drawbacks of the traditional MEA liquid method that is used for CO 2 capture include the requirement for heavy equipment, and the toxic, flammable, corrosive, and volatile nature of the process [3]. Therefore, CO 2 capture by means of adsorption in porous materials has received increasing attention because this method has proven to be superior than the conventional technologies in terms of the advantages associated with it. Compared to traditional processes, the convenient reversibility of adsorption on porous solid materials based on physisorption for the capture and release of CO 2 makes this technique a greener and more cost-efficient method. To date, a variety of solid-based materials have been intensively studied for gas adsorption, especially CO 2 capture, such as metal organic frameworks, covalent organic frameworks, zeolites, activated carbons, functionalized graphene, carbon molecular sieves, chemically modified mesoporous materials, etc [4][5][6][7][8][9][10][11][12][13]. Furthermore, the low concentration of CO 2 in flue gas (ca. 15%) requires selective separation from the large volume of other component gases, mainly N 2 [14]. Ideally, solid sorbents designed for CO 2 capture should offer reduced energy consumption for regeneration, greater capture capacity, stability, selectivity, ease of handling, reduced environmental impact, etc. Currently, there is significant interest in the development of solid carbon adsorbents that are capable of selectively adsorbing CO 2 , because of their large surface area, porosity, abundance, cost efficiency, low density, fast adsorption kinetics, and high chemical and thermal stability [15][16][17][18]. Furthermore, these materials offer some advantages in terms of ease of handing, pore structure, and surface characteristics, as well as low-regeneration energy [19]. Therefore, carbon materials are currently considered attractive candidate sorbents for CO 2 capture in the development of alternate clean and sustainable energy technologies. Based on these strengths, increasing efforts have recently been devoted to the synthesis of element-doped porous carbons that combine the high porosity and unique properties of doped carbon frameworks. The MCM-48 templated carbons have a high porosity without activation usually required to develop an accessible porous structure. Nitrogen doping has earned particular distinction because of the enhanced surface polarity, electrical conductivity, and electron-donor tendency conferred to the mesoporous carbons by nitrogen incorporation, which enables their application in CO 2 capture, electric double-layer capacitors, fuel cells, catalysis, etc [20,21]. In the present study, we describe an alternate approach for the production of nitrogen-containing carbon materials with a cubic structure that facilitates CO 2 diffusion and capture. Fig. 1a p...

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Nanoconfinement degradation in NaAlH4/CMK-1

Cited by 33 publications

References 46 publications

Complex and liquid hydrides for energy storage

Complex and liquid hydrides for energy storage

Hydrogen Storage Stability of Nanoconfined MgH2 upon Cycling

Investigation of carbon dioxide adsorption by nitrogen-doped carbons synthesized from cubic MCM-48 mesoporous silica

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