Synthesis and hydrogen storage properties of mechanically ball-milled SiC/MgH2 nanocomposites

Effect of SiC on hydrogen storage properties of Mg95Ni5 prepared by hydriding combustion synthesis and mechanical milling

“…The above microstructures are favorable for the increasing of the active sites and the shortening of the hydrogen diffusion distance, with a result of improving hydriding and dehydriding properties. This effect has also been observed by other researchers for brittle-hard systems [40][41][42][43]46,47]. Secondly, the SiC/Mg interface may act as active sites for nucleation during hydriding and dehydriding, and then decrease the nucleation barrier [33,48,49].…”

“…Recently, it has been reported that SiC can also significantly improve the hydrogen desorption properties of commercial MgH 2 by means of mechanical milling for these reasons as below [39][40][41][42][43]. Firstly, as a hard material, SiC can decrease the grain size of MgH 2 , increase the concentration of defects, which are beneficial for the dehydriding kinetics by means of reducing the diffusion path.…”

Catalytic effect of SrTiO3 on the hydrogen storage behaviour of MgH2

“…Thus from the point of physical perspective, the catalytic effect of SrTiO 3 is due to its ability to reduce the particle sizes. Finer particle sizes will lead to higher absorption and desorption kinetics due to larger surface areas and higher nucleation sites as well as shorter hydrogen diffusion lengths [6,12,20,22,38] .…”

“…[20,21] and Imamura et al . [22] studied the improvement done by SiC to the MgH 2 system. In the first study [20] , Ranjbar et al .…”

“…As for Imamura et al . [22] , they had studied the synthesising process of the MgH 2 -SiC composite. They observed that 10 mol% of SiC had caused the composite to dehydrogenate at 207 °C and 75 mol% of the SiC had further lowered the dehydrogenation temperature to 164 °C.…”