Enhanced hydrogen storage kinetics and stability by synergistic effects of in situ formed CeH2.73 and Ni in CeH2.73-MgH 2-Ni nanocomposites

Ouyang, L. Z., Yang, X. S., Zhu, M., Liu, J. W., Dong, H. W., Sun, D. L., Zou, J. and Yao, X. D. (2014) Enhanced hydrogen storage kinetics and stability by synergistic effects of in situ formed CeH2.73 and Ni in CeH2.73-MgH 2-Ni nanocomposites. Journal of Physical Chemistry C, 118 15: 7808-7820. doi:10.1021/jp500439n


Author Ouyang, L. Z.
Yang, X. S.
Zhu, M.
Liu, J. W.
Dong, H. W.
Sun, D. L.
Zou, J.
Yao, X. D.
Title Enhanced hydrogen storage kinetics and stability by synergistic effects of in situ formed CeH2.73 and Ni in CeH2.73-MgH 2-Ni nanocomposites
Formatted title
Enhanced hydrogen storage kinetics and stability by synergistic effects of in situ formed CeH2.73 and Ni in CeH2.73-MgH 2-Ni nanocomposites
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7455
1932-7447
Publication date 2014-04-17
Year available 2014
Sub-type Article (original research)
DOI 10.1021/jp500439n
Open Access Status
Volume 118
Issue 15
Start page 7808
End page 7820
Total pages 13
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2015
Language eng
Formatted abstract
Mg-based materials are promising candidates for high capacity hydrogen storage. However, their poor hydrogenation/dehydrogenation kinetics and high desorption temperature are the main obstacles to their applications. This paper reports a method for in situ formation of cycle stable CeH2.73- MgH2-Ni nanocomposites, from the hydrogenation of as-melt Mg 80Ce18Ni2 alloy, with excellent hydrogen storage performance. The nanocomposites demonstrate reversible hydrogen storage capacity of more than 4.0 wt %, at a low desorption temperature with fast kinetics and long cycle life. The temperature for the full hydrogenation/ dehydrogenation cycle of the composites is significantly decreased to 505 K, which is about 100 K lower than that for pure Mg. The hydrogen desorption activation energy is 63 ± 3 kJ/mol H2 for the composites, which is significantly lower than those of Mg3Ce alloy and pure Mg (104 ± 7 and 158 ± 2 kJ/mol H2, respectively). X-ray diffraction and transmission electron microscopy have been used to reveal the mechanism that delivers this excellent cycle stability and fast hydriding/dehydriding kinetics. It is found that the hydriding/dehydriding process is catalyzed by the combination of in situ formed extremely fine CeH2/CeH2.73 and Ni to Mg/MgH2. In addition, this nanocomposite structure can effectively suppress Mg/MgH2 grain growth and enable the material to maintain its high performance for more than 500 hydrogenation dehydrogenation cycles.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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