Hydrogen storage properties of MgH2-SiC composites

Authors

Abbas Ranjbar, University of WollongongFollow
Zaiping Guo, University of WollongongFollow
Xuebin Yu, University of WollongongFollow
David Wexler, University of WollongongFollow
Andrzej Calka, University of WollongongFollow
C J. Kim, Materials Science, Fudan University, Shanghai
Hua-Kun Liu, University of WollongongFollow

RIS ID

24586

Publication Details

Ranjbar, A., Guo, Z., Yu, X., Wexler, D., Calka, A., Kim, C. J. & Liu, H. K. (2009). Hydrogen storage properties of MgH₂-SiC composites. Materials Chemistry and Physics, 114 (1), 168-172.

Abstract

This paper describes the effects of the addition of SiC on the hydrogen storage properties of MgH₂ synthesized by ball milling. Transmission electron microscope images confirm that ultra-fine SiC particles are uniformly dispersed within the MgH₂ matrix. It was found that the hydrogen absorption/desorption kinetics of MgH₂ can be improved by the addition of a small amount of SiC (5 wt%). Higher level doping introduces negative effects, such as lower capacity, slower absorption/desorption rates, and higher hysteresis, compared to samples with lower SiC doping levels. It is believed that SiC can help to break up particles, reduce the grain size, and improve the surface area of MgH₂, however, large amounts of SiC could also block the hydrogen diffusion path to some extent, which degrades the hydrogen absorption/desorption performance.