Hydrogen release from Mg(NH2)2-MgH2 through mechanochemical reaction.
A total of 7.4 wt % of hydrogen was released from the mixture of magnesium amide and magnesium hydride at a molar ratio of 1:2 by mechanical ball milling. Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD) characterizations along with the amount of hydrogen released at different stages of ball milling reveal that magnesium imide was first formed in the reaction. The imide then reacted continuously with magnesium hydride and was converted to magnesium nitride and hydrogen. Thermodynamic calculation shows that the hydrogen desorption is a mild endothermic reaction with the standard enthalpy change of about 3.5 kJ/mol of H2.
Hu
Jianjiang
J
Department of Physics, National University of Singapore, Singapore 117542.
Wu
Guotao
G
Liu
Yongfeng
Y
Xiong
Zhitao
Z
Chen
Ping
P
Murata
Kenji
K
Sakata
Ko
K
Wolf
Gerd
G