Effects of different carbon materials on MgH2 decomposition

Lillo-Ródenas, M.A.; Guo, Zhengxiao; Aguey-Zinsou, Kondo Francois; Cazorla‐Amorós, Diego; Linares-Solano, Á.

doi:10.1016/j.carbon.2007.10.033

Cited by 165 publications

(79 citation statements)

References 41 publications

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“…These values were reached after a long grinding time and under more energetic conditions The effect of using carbon materials with different structures on MgH 2 decomposition was studied and the carbon nanotubes showed better results than graphite and activated carbon. So the ones that do not have a 1-D morphology showed the worst results and therefore contributes to interpret these findings mentioned previously 6 . Besides the catalytic properties of those materials, it seems as if the one-dimensional morphology facilitates the hydrogen diffusion.…”

Section: Resultssupporting

confidence: 65%

“…Besides the catalytic properties of those three types of materials, it seems as if the one-dimensional morphology facilitates the hydrogen diffusion. The effects of using different carbon materials on MgH 2 decomposition was studied and carbon nanotubes showed better results than graphite and activated carbon that to not have a 1-D morphology and therefore contributes to interpret these findings 6 . Other studies also investigated the results of the addition of MWCNT to MgH 2 15,16 .…”

Section: Resultsmentioning

confidence: 99%

“…However, the use of magnesium for hydrogen storage presents some limitations such as slow kinetics and high operation temperatures. A nanomaterial such as carbon nanotube (CNT) is milled to magnesium to help overcome those limitations aforementioned [6][7][8][9][10][11] . Researchers agree that carbon nanotubes can act as a catalyst enhancing hydrogen uptake but the sorption mechanism is still not fully understood 8 .The type of CNT chosen for this work was the multi-walled carbon nanotube (MWCNT) and magnesium hydride (MgH 2 ) was used to be milled to the catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

et al. 2017

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Studies show that the carbon nanotubes (CNTs) serve as hydrogen diffusion channels, when used with magnesium hydride. The hydrogen sorption study, of a MgH 2 and 5wt% of multiwalled carbon nanotubes mixture, was the main purpose of this work. The samples were analyzed by means of X-ray diffraction (XRD) and also studied in a differential scanning calorimeter (DSC). The carbon nanotubes, that were ball milled during 20 min to the MgH 2, were observed in the scanning electron microscopy (SEM) images. The mixture of MgH 2 -CNT turned out to enhance the hydrogen sorption when compared to pure MgH 2 and in 5 min it desorbed around 5 wt% of hydrogen, at 350 o C and 0.1 bar.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

et al. 2017

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“…CNTs and CNFs can contain Ni, Co or Fe impurities, for example that can get into contact with the metal (hydride) phase due to destruction of the tubes upon ball-milling. 35,36 Also the ball mill vial or the (typically steel) balls are sources for contaminations.…”

Section: Synthesis Strategiesmentioning

confidence: 99%

“…35,[73][74][75][76][77] The effect of carbon as additive on the hydrogen release from ball-milled MgH 2 is illustrated in Fig. 5.…”

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The impact of carbon materials on the hydrogen storage properties of light metal hydrides

2011

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The safe and efficient storage of hydrogen is still one of the remaining challenges towards fuel cell powered cars. Metal hydrides are a promising class of materials as they allow the storage of large amounts of hydrogen in a small volume at room temperature and low pressures. However, usually the kinetics of hydrogen release and uptake and the thermodynamic properties do not satisfy the requirements for practical applications. Therefore current research focuses on catalysis and the thermodynamic tailoring of metal hydride systems. Surprisingly, carbon materials used as additive or support are very effective to improve the hydrogen storage properties of metal hydrides allowing fast kinetics and even a change in the thermodynamic properties. Even though the underlying mechanisms are not always well understood, the beneficial effect is probably related to the peculiar structure of the carbon materials. This feature article gives an introduction to the different carbon materials, an overview of the preparation strategies to synthesize carbon/hydride nanocomposites, and highlights the beneficial effect of carbon by discussing two important hydrides: MgH 2 and NaAlH 4 .

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Catalytic Application of Carbon‐based Nanostructured Materials on Hydrogen Sorption Behavior of Light Metal Hydrides

Shahi¹,

Srivastava²

2013

Advanced Carbon Materials and Technology

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The development of hydrogen storage materials with favorable thermodynamics (e.g., kinetics, desorption/adsorption temperature) has attracted considerable attention in recent years. Alanates, amide-hydride mixtures and magnesium hydride are the candidates with the most potential storage material due to their high hydrogen storage capacity and good reversibility, but each has its own limitations (e.g., high desorption temperature and sluggish kinetics). Carbon has many allotropes such as graphite, activated carbon, fullerenes, carbon nanotubes, and the most recent, graphene, etc. These have novel properties which are useful in many new innovative applications. Several recent investigations have also demonstrated the benefi cial effect of carbon materials as catalyst for enhancing sorption behavior of different light hydrogen storage materials. Carbon with a small curvature radius exhibits prominent "catalytic" effect for light metal and complex hydrides. The reduction in curvature radius of carbon nanostructures enhances the electron affi nity and interaction of carbon with hydrogen because the hydrogen release/combination energy has been changed, and consequently, the de-/rehydrogenation kinetics of the material is improved. In this chapter, we will highlight the current advances (including our recent works) in the hydrogen sorption enhancement of metal and complex hydrides by incorporating carbon nanomaterials as a catalyst. There will be a particular emphasis on carbon nanotubes,

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Effects of different carbon materials on MgH2 decomposition

Cited by 165 publications

References 41 publications

Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

The impact of carbon materials on the hydrogen storage properties of light metal hydrides

Catalytic Application of Carbon‐based Nanostructured Materials on Hydrogen Sorption Behavior of Light Metal Hydrides

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