Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II: Microstructure Evolution

Chengshang Zhou; Zhigang Zak Fang; Robert C. Bowman; Yang Xia; Jun Lu; Xiangyi Luo; Yang Ren

doi:10.1021/acs.jpcc.5b06192

Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II: Microstructure Evolution

Chengshang Zhou
, Zhigang Zak Fang^*
, Robert C. Bowman
, Yang Xia
, Jun Lu
, Xiangyi Luo
, Yang Ren

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

28 Citations (Scopus)

Abstract

In Part I, the cyclic stabilities of the kinetics of catalyzed MgH₂ systems including MgH₂-TiH₂, MgH₂-TiMn₂, and MgH₂-VTiCr were investigated, showing stable kinetics at 300 °C but deteriorations of the hydrogenation kinetics at temperatures below 150 °C. The present Part II describes the characterization of uncycled and cycled catalyzed MgH₂ by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. XRD analysis shows the crystallite sizes of the Mg and MgH₂ significantly increased after the cycling. The mean crystallite sizes of the catalysts (TiH₂ and VTiCr) increased moderately after the cycling. SEM and TEM imaging were used to compare the microstructures of uncycled (as-milled) and cycled materials, revealing a drastic change of the microstructure after 100 cycles. In particular, results from energy-dispersive spectroscopy (EDS) mapping show that a change of distribution of the catalyst particles in the Mg and MgH₂ phase occurred during the cycling.

Original language	English
Pages (from-to)	22272-22280
Journal	The Journal of Physical Chemistry C
Volume	119
Issue number	39
DOIs	https://doi.org/10.1021/acs.jpcc.5b06192
Publication status	Published - 11 Sept 2015
Externally published	Yes

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@article{75603b12a04044a2a5831764bee5afdf,

title = "Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II: Microstructure Evolution",

abstract = "In Part I, the cyclic stabilities of the kinetics of catalyzed MgH2 systems including MgH2-TiH2, MgH2-TiMn2, and MgH2-VTiCr were investigated, showing stable kinetics at 300 °C but deteriorations of the hydrogenation kinetics at temperatures below 150 °C. The present Part II describes the characterization of uncycled and cycled catalyzed MgH2 by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. XRD analysis shows the crystallite sizes of the Mg and MgH2 significantly increased after the cycling. The mean crystallite sizes of the catalysts (TiH2 and VTiCr) increased moderately after the cycling. SEM and TEM imaging were used to compare the microstructures of uncycled (as-milled) and cycled materials, revealing a drastic change of the microstructure after 100 cycles. In particular, results from energy-dispersive spectroscopy (EDS) mapping show that a change of distribution of the catalyst particles in the Mg and MgH2 phase occurred during the cycling.",

author = "Chengshang Zhou and Fang, \{Zhigang Zak\} and Bowman, \{Robert C.\} and Yang Xia and Jun Lu and Xiangyi Luo and Yang Ren",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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doi = "10.1021/acs.jpcc.5b06192",

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volume = "119",

pages = "22272--22280",

journal = "The Journal of Physical Chemistry C",

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Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II: Microstructure Evolution. / Zhou, Chengshang; Fang, Zhigang Zak; Bowman, Robert C. et al.
In: The Journal of Physical Chemistry C, Vol. 119, No. 39, 11.09.2015, p. 22272-22280.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II

T2 - Microstructure Evolution

AU - Zhou, Chengshang

AU - Fang, Zhigang Zak

AU - Bowman, Robert C.

AU - Xia, Yang

AU - Lu, Jun

AU - Luo, Xiangyi

AU - Ren, Yang

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2015/9/11

Y1 - 2015/9/11

N2 - In Part I, the cyclic stabilities of the kinetics of catalyzed MgH2 systems including MgH2-TiH2, MgH2-TiMn2, and MgH2-VTiCr were investigated, showing stable kinetics at 300 °C but deteriorations of the hydrogenation kinetics at temperatures below 150 °C. The present Part II describes the characterization of uncycled and cycled catalyzed MgH2 by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. XRD analysis shows the crystallite sizes of the Mg and MgH2 significantly increased after the cycling. The mean crystallite sizes of the catalysts (TiH2 and VTiCr) increased moderately after the cycling. SEM and TEM imaging were used to compare the microstructures of uncycled (as-milled) and cycled materials, revealing a drastic change of the microstructure after 100 cycles. In particular, results from energy-dispersive spectroscopy (EDS) mapping show that a change of distribution of the catalyst particles in the Mg and MgH2 phase occurred during the cycling.

AB - In Part I, the cyclic stabilities of the kinetics of catalyzed MgH2 systems including MgH2-TiH2, MgH2-TiMn2, and MgH2-VTiCr were investigated, showing stable kinetics at 300 °C but deteriorations of the hydrogenation kinetics at temperatures below 150 °C. The present Part II describes the characterization of uncycled and cycled catalyzed MgH2 by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. XRD analysis shows the crystallite sizes of the Mg and MgH2 significantly increased after the cycling. The mean crystallite sizes of the catalysts (TiH2 and VTiCr) increased moderately after the cycling. SEM and TEM imaging were used to compare the microstructures of uncycled (as-milled) and cycled materials, revealing a drastic change of the microstructure after 100 cycles. In particular, results from energy-dispersive spectroscopy (EDS) mapping show that a change of distribution of the catalyst particles in the Mg and MgH2 phase occurred during the cycling.

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U2 - 10.1021/acs.jpcc.5b06192

DO - 10.1021/acs.jpcc.5b06192

M3 - RGC 21 - Publication in refereed journal

SN - 1932-7447

VL - 119

SP - 22272

EP - 22280

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

IS - 39

ER -

Stability of Catalyzed Magnesium Hydride Nanocrystalline During Hydrogen Cycling. Part II: Microstructure Evolution

Abstract

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