The role of SiC on the Desorption Temperature of Mg-based Hydrogen Storage Materials Prepared by Intensive Milling Method

Zulkarnain Jalil

doi:10.18502/keg.v1i1.498

Abstract

<p>Magnesium, theoretically, have the ability to absorb hydrogen in large quantities (~ 7.6 wt%). However, the kinetic reaction is very slow, thereby hindering the application of magnesium for hydrogen storage material. In this paper, we reported a series of preliminary studies on magnesium inserting with silicon carbide (2 wt%)obtain by mechanical milling method. The vibratory mill type apparatus was used for 180 hours. As the results, structural characterization by XRD showed that the crystallite size after milling for 180 hours decreased around tens nanometer. It was also found that the desorption temperature for the sample after 180 milling inform us that the material decomposed at 330°C. It can concluded that Mg catalyzed with 2 wt% of silicon carbide (SiC) can be prepared by vibratory ball milling. </p>

Highlights

Among the metal hydrides, magnesium has the theoretically highest weight capacity for hydrogen storage (7.6 wt.%), lightweight and a reasonably low cost [1]
In order to find a more suitable co-catalyst material to be used with magnesium, Ranjbar et al [8], introduced a new catalyst based on silicon carbide (SiC) to be inserted in magnesium as host material
The sorption properties were improved and the kinetics was very fast. By using this finding as a motive of our study, here we report our work on Mg catalyzed with 2wt% of SiC prepared by vibration ball milling (VBM)

Summary

Introduction

Magnesium has the theoretically highest weight capacity for hydrogen storage (7.6 wt.%), lightweight and a reasonably low cost [1]. High working temperature, slow reaction kinetics and difficult activation limit the practical application of Mg-based hydrides. Many efforts have been done to improve the adsorption properties and reaction kinetics such as element substitution (metal or metal oxides) as catalyst in nanometer scale and modification of ball milling technique as well [2,3,4,5]. The reactive ball milling under hydrogen atmosphere was successfully introduced to prepare hydrogen storage materials [6,7]. The sorption properties were improved and the kinetics was very fast. By using this finding as a motive of our study, here we report our work on Mg catalyzed with 2wt% of SiC prepared by vibration ball milling (VBM).

Objectives

Methods

Results

Conclusion