Effects of Ce-Based Dopants on the Hydrogen Storage Material of NaAlH4

2012 ◽  
Vol 1441 ◽  
Author(s):  
Jianjiang Hu ◽  
Raiker Witter ◽  
Shuhua Ren ◽  
Maximilian Fichtner
Keyword(s):  
Hydrogen Storage ◽  
Sorption Properties ◽  
Desorption Kinetics ◽  
Chemical Forms ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Heating Treatment ◽  
Up Scaling

ABSTRACTCerium in various chemical forms was introduced into NaAlH4 to study the hydrogen sorption properties of the resulted material. Although all the Ce precursors tested in this work resulted in a reversible hydrogen storage material, an immediate enhancement in the desorption kinetics could be achieved by a heating treatment, resulting in the in situ formation of cerium aluminide (CeAl4) in the material. While the use of CeAl4 instead of CeCl3 can increase the hydrogen capacity by bypassing the formation of the ineffective NaCl, the highest capacity of 4.9 wt% was obtained from NaAlH4 doped directly with commercial metallic cerium, which may provide a much simplified process for a possible up-scaling preparation of this hydrogen storage material.

scholarly journals Improved kinetic behaviour of Mg(NH2)2-2LiH doped with nanostructured K-modified-LixTiyOz for hydrogen storage

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Gökhan Gizer ◽  
Julián Puszkiel ◽  
Maria Victoria Castro Riglos ◽  
Claudio Pistidda ◽  
José Martín Ramallo-López ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Kinetic Behaviour ◽  
Enhanced Absorption ◽  
Tiny Amount ◽  
Slow Absorption ◽  
Kinetic Barriers

AbstractThe system Mg(NH2)2 + 2LiH is considered as an interesting solid-state hydrogen storage material owing to its low thermodynamic stability of ca. 40 kJ/mol H2 and high gravimetric hydrogen capacity of 5.6 wt.%. However, high kinetic barriers lead to slow absorption/desorption rates even at relatively high temperatures (>180 °C). In this work, we investigate the effects of the addition of K-modified LixTiyOz on the absorption/desorption behaviour of the Mg(NH2)2 + 2LiH system. In comparison with the pristine Mg(NH2)2 + 2LiH, the system containing a tiny amount of nanostructured K-modified LixTiyOz shows enhanced absorption/desorption behaviour. The doped material presents a sensibly reduced (∼30 °C) desorption onset temperature, notably shorter hydrogen absorption/desorption times and reversible hydrogen capacity of about 3 wt.% H2 upon cycling. Studies on the absorption/desorption processes and micro/nanostructural characterizations of the Mg(NH2)2 + 2LiH + K-modified LixTiyOz system hint to the fact that the presence of in situ formed nanostructure K2TiO3 is the main responsible for the observed improved kinetic behaviour.

scholarly journals In-Situ TEM Observation for Reaction Mechanism in MgH2 Hydrogen Storage Material

2010 ◽  
Vol 74 (3) ◽  
pp. 205-208 ◽  
Author(s):  
Akifumi Ono ◽  
Shigehito Isobe ◽  
Yongming Wang ◽  
Naoyuki Hashimoto ◽  
Somei Ohnuki
Keyword(s):  
Reaction Mechanism ◽  
Hydrogen Storage ◽  
In Situ Tem ◽  
Hydrogen Storage Material ◽  
Storage Material

In Situ Hydrogenation and Desulfurization of CS2 by Mg-Based Hydrogen Storage Material:Products and Mechanism Analysis

2013 ◽  
Vol 726-731 ◽  
pp. 668-672
Author(s):  
Tong Huan Zhang ◽  
Min Jian Yang ◽  
Peng Bo Li ◽  
Wei Xian Ran ◽  
Qian Qian Zhang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Ball Milling ◽  
Hydrogen Desorption ◽  
Mechanism Analysis ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Coupling Relationship ◽  
Negative Effect ◽  
Sulfur Fixation

Mg-based hydrogen storage material was prepared by ball milling, and then the material was used to react with CS2. The morphology and hydrogen desorption properties of the hydrogen storage material as well as the CS2hydrogenation product were analyzed. Results show that in situ hydrogenation and desulfurization of CS2happens with the MgH2in the hydrogen storage material as hydrogen donator and desulfurizer at 300 °C and ordinary pressure, and MgS, CH4and H2S are generated from the reaction. There is a coupling relationship between dehydrogenation of the hydrogen storage material and hydrogenation of CS2. The addition of nickel and molybdenum show negative effect on the sulfur fixation capability of the Mg-based hydrogen storage material though they could decrease the dehydrogenation temperature of the material.

scholarly journals Active catalytic species generated in situ in zirconia incorporated hydrogen storage material magnesium hydride

2021 ◽  
Author(s):  
D. Pukazhselvan ◽  
K.S. Sandhya ◽  
Devaraj Ramasamy ◽  
Aliaksandr Shaula ◽  
Igor Bdikin ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Magnesium Hydride ◽  
Hydrogen Storage Material ◽  
Storage Material

Periodic DFT insights into hydrogen storage of a B4CN3 nanosheet

2021 ◽  
Vol 45 (5) ◽  
pp. 2463-2469
Author(s):  
Rezvan Rahimi ◽  
Mohammad Solimannejad
Keyword(s):  
Hydrogen Storage ◽  
Adsorption Energy ◽  
Desorption Kinetics ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Uptake Capacity ◽  
Target Set ◽  
Adsorption Desorption ◽  
Periodic Dft ◽  
The Ideal

The B4CN3 monolayer is fulfilling both the conditions for utilizing it as a hydrogen storage material. First, favorable averaged adsorption energy per H2 molecule which is within the ideal range for faster adsorption/desorption kinetics and second, the H2 uptake capacity of B4CN3 monolayer is higher than the target set by DOE (5.5 wt% by 2020).

Mg-Ni-H Hydrogen Storage System Prepared by Controlled Hydriding Combustion Synthesis

2011 ◽  
Vol 197-198 ◽  
pp. 749-752 ◽  
Author(s):  
Jing Liu ◽  
Qian Li ◽  
Kuo Chih Chou
Keyword(s):  
Magnetic Field ◽  
Hydrogen Storage ◽  
Combustion Synthesis ◽  
High Magnetic Field ◽  
Storage System ◽  
Magnetic Intensity ◽  
Hydrogen Storage Material ◽  
Storage Material ◽  
Hydrogen Capacity ◽  
Hydrogen Storage System

The Mg2NiH4 hydrogen storage material was successfully prepared by controlled hydriding combustion synthesis (CHCS) from Mg and Ni powders in a high magnetic field. The effects of magnetic intensity on the structure, phase compositions and the hydriding/dehydriding (A/D) properties of the composite are investigated. As a result, a high magnetic field promotes the formation of Mg2NiH4. The PCT results show that the maximal hydrogen capacity at 573 K is 3.59 wt.%. The comparison of the hydrogen A/D results under the different conditions suggested that 4 T is the optimal magnetic intensity in our trial.

Enhanced quantum yield of nitrogen fixation for hydrogen storage with in situ-formed carbonaceous radicals

2015 ◽  
Vol 51 (23) ◽  
pp. 4785-4788 ◽  
Author(s):  
Weirong Zhao ◽  
Haiping Xi ◽  
Meng Zhang ◽  
Yajun Li ◽  
Jinsheng Chen ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Quantum Yield ◽  
Hydrogen Storage ◽  
Uv Irradiation ◽  
Hydrogen Storage Material ◽  
Storage Material

N2 can be reduced to NH3, a green hydrogen storage material, using suitable photocatalysts and scavengers under UV irradiation.

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