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Author

Moon, Hoi Ri
Functional Inorganic Nanomaterials for Energy Lab (FINE)
Research Interests
  • Inorganic-organic hybrid materials, carbon capture materials, hydrogen storage materials, heterogeneous catalyst

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Air-stable magnesium nanocomposites provide rapid and high-capacity hydrogen storage without using heavy-metal catalysts

Cited 124 times inthomson ciCited 111 times inthomson ci
Title
Air-stable magnesium nanocomposites provide rapid and high-capacity hydrogen storage without using heavy-metal catalysts
Author
Jeon, Ki-JoonMoon, Hoi RiRuminski, Anne M.Jiang, BinKisielowski, ChristianBardhan, RiziaUrban, Jeffrey J.
Keywords
Air-stable; Alternative energy; Bond formation; Carbon based materials; Clean energy; Combustion products; Diffusion paths; Film study; Gas-barrier; High density; High energy densities; High-capacity; Light weight; Magnesium nano-composites; matrix; Metal catalyst; Metal hydrides; Metal organic framework; Micro structuring; Nano-structuring; Nanoporous polymers; Organic matter; Potential sources; Room temperature; Temperature rise; Theoretical calculations; Thermodynamic state
Issue Date
201104
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v.10, no.4, pp.286 - 290
Abstract
Hydrogen is a promising alternative energy carrier that can potentially facilitate the transition from fossil fuels to sources of clean energy because of its prominent advantages such as high energy density (142 MJ kg(-1); ref. 1), great variety of potential sources (for example water, biomass, organic matter), light weight, and low environmental impact (water is the sole combustion product). However, there remains a challenge to produce a material capable of simultaneously optimizing two conflicting criteria-absorbing hydrogen strongly enough to form a stable thermodynamic state, but weakly enough to release it on-demand with a small temperature rise. Many materials under development, including metal-organic frameworks, nanoporous polymers, and other carbon-based materials, physisorb only a small amount of hydrogen (typically 1-2 wt%) at room temperature. Metal hydrides were traditionally thought to be unsuitable materials because of their high bond formation enthalpies (for example MgH2 has a Delta H-f similar to 75 kJ mol(-1)), thus requiring unacceptably high release temperatures resulting in low energy efficiency. However, recent theoretical calculations and metal-catalysed thin-film studies have shown that microstructuring of these materials can enhance the kinetics by decreasing diffusion path lengths for hydrogen and decreasing the required thickness of the poorly permeable hydride layer that forms during absorption. Here, we report the synthesis of an air-stable composite material that consists of metallic Mg nanocrystals (NCs) in a gas-barrier polymer matrix that enables both the storage of a high density of hydrogen (up to 6 wt% of Mg, 4 wt% for the composite) and rapid kinetics (loading in < 30 min at 200 degrees C). Moreover, nanostructuring of the Mg provides rapid storage kinetics without using expensive heavy-metal catalysts.
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DOI
http://dx.doi.org/10.1038/NMAT2978
ISSN
1476-1122
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