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Abstract
The hydrogen storage characteristics of SiC/MgH 2 nanocomposites which are prepared by mechanical ball milling of MgH 2 and SiC with cyclohexane have been studied. MgH 2 as a starting material exhibited a desorption peak of hydrogen at 705 K in thermal desorption spectrometry (TDS), while the ball-milled SiC/MgH 2 nanocomposites showed much lower desorption temperatures near 437 K. The hydrogen storage properties of SiC/MgH 2 were significantly improved as a result of nanocomposite formation. In addition, the nanocomposites were characterized by X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimeter (DSC) and pressure–composition isotherm (PCT) measurements. For the SiC/MgH 2 nanocomposites, the reversibility of hydrogen absorption/desorption was observed, but heating above 573 K led to the irreversible breakdown of nanocomposites into MgH 2 and SiC.
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