Hydrogen physisorption in ionic solid compounds with exposed metal cations at room temperature

AbstractThe hydrogen adsorption capacity of various carbon nanostructures including single-wall carbon nanotubes, graphitic nanofibers, activated carbon, and graphite has been measured as a function of pressure and temperature. Our results show that at room temperature and a pressure of 80 bar the hydrogen storage capacity is less than 1 wt.% for all samples. Upon cooling, the capacity of hydrogen adsorption increases with decreasing temperature and the highest value was observed to be 2.9 wt. % at 50 bar and 77 K. The correlation between hydrogen storage capacity and specific surface area is discussed.

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Possible Applications of Nanomaterials for Nuclear Fusion Devices

Energy Harvesting and Systems ◽

10.1515/ehs-2018-0007 ◽

2018 ◽

Vol 5 (1-2) ◽

pp. 11-27 ◽

Cited By ~ 1

Author(s):

Takeo Oku

Keyword(s):

Hydrogen Storage ◽

Heavy Ions ◽

Room Temperature ◽

Nuclear Fusion ◽

Alloy Formation ◽

Muon Catalyzed Fusion ◽

Energy Materials ◽

Plasma Facing Components ◽

Key Points ◽

Diffusion Calculation

Abstract Conditions of nuclear fusion and nuclear fusion devices were described, and some possible applications of nanomaterials for nuclear fusion devices were presented in the present article. Muon-catalyzed fusion is one of methods for nuclear fusion to cause even at room temperature or lower, and protons or heavy ions with huge energy are irradiated to metals such as beryllium or copper, which results in emission of negative or positive charged muons from the metals. An experiment using a pyroelectric power source using lithium tantalite crystal was also reported to achieve nuclear fusion in a desktop-like device. Hydrogen storage is also important for the fusion devices, and the possibility of hydrogen storage in hydrogen storage metallic alloys was studied by diffusion calculation and potential calculation of deuterium fusion. Enhancement of deuterium diffusion in the Pd alloys would be one of the key points for energy materials. Carbon(C)/copper(Cu)-based composite materials with high thermal conductivity and good stability at high temperatures were also developed by adding a small amount of titanium, which has a low enthalpy of alloy formation with C and Cu. These carbon-based materials could be a candidate material for the plasma facing components of fusion devices.

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Early atomic transition metal cations reacting with ammonia at room temperature: H2 elimination and NH3 ligation kinetics across and down the periodic table

International Journal of Mass Spectrometry ◽

10.1016/j.ijms.2018.10.021 ◽

2019 ◽

Vol 435 ◽

pp. 181-187 ◽

Cited By ~ 2

Author(s):

Voislav Blagojevic ◽

Vitali V. Lavrov ◽

Gregory K. Koyanagi ◽

Diethard K. Bohme

Keyword(s):

Transition Metal ◽

Periodic Table ◽

Room Temperature ◽

Metal Cations ◽

Atomic Transition ◽

Transition Metal Cations ◽

H2 Elimination

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Ti-V-C-Based Alloy with a FCC Lattice Structure for Hydrogen Storage

Molecules ◽

10.3390/molecules24030552 ◽

2019 ◽

Vol 24 (3) ◽

pp. 552

Author(s):

Bo Li ◽

Liqing He ◽

Jianding Li ◽

Hai-Wen Li ◽

Zhouguang Lu ◽

...

Keyword(s):

Hydrogen Storage ◽

Room Temperature ◽

Lattice Structure ◽

Activation Process ◽

Face Centered Cubic ◽

Hydrogen Storage Materials ◽

Fcc Lattice ◽

Bcc Structure ◽

Face Centered ◽

Fcc Structure

Here we report a Ti50V50-10 wt.% C alloy with a unique lattice and microstructure for hydrogen storage development. Different from a traditionally synthesized Ti50V50 alloy prepared by a melting method and having a body-centered cubic (BCC) structure, this Ti50V50-C alloy synthesized by a mechanical alloying method is with a face-centered cubic (FCC) structure (space group: Fm-3m No. 225). The crystalline size is 60 nm. This alloy may directly absorb hydrogen near room temperature without any activation process. Mechanisms of the good kinetics from lattice and microstructure aspects were discussed. Findings reported here may indicate a new possibility in the development of future hydrogen storage materials.

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