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 - Publisher Copyright:
© 2015 American Chemical Society.
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.
UR - http://www.scopus.com/inward/record.url?scp=84942756742&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.5b06192
DO - 10.1021/acs.jpcc.5b06192
M3 - Article
AN - SCOPUS:84942756742
SN - 1932-7447
VL - 119
SP - 22272
EP - 22280
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 39
ER -