Effect of nanostructure Ni on the sorption properties of mechanical milled MgH2 for solid hydrogen storage materials

Zulkarnain Jalil,Adi Rahwanto,Erfan Handoko,Ade Gafar Abdullah,Asep Bayu Dani Nandiyanto

doi:10.1051/matecconf/201819702014

Zulkarnain Jalil, Adi Rahwanto + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201819702014

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Abstract

Among the metal hydrides, magnesium has the theoretically highest weight capacity for hydrogen storage (7.6wt.%), lightweight and a reasonably low cost. However, high working temperature (<300°C), slow reaction kinetics (need more than 1 hour to produce 5 wt% of hydrogen) and difficult activation limit the practical application of Mg-based hydrides. In order to improve their performance, MgH2 was catalyzed with Ni nanoparticles which reactively milled under hydrogen atmosphere. Phase identification and microstructure were characterised by XRD and scanning electron microscope (SEM). Hydrogen sorption properties was studied by gravimetric analysis method. The results show that, small amount of Ni in nanometer scale proved to be as a suitable catalyst for improvement the kinetics of MgH2 and at the same time allowed to reduce the milling time process.

Highlights

Among the metal hydrides, magnesium has the theoretically highest weight capacity for hydrogen storage (7.6wt.%), lightweight and a reasonably low cost 1
The reactive ball milling under hydrogen atmosphere was successfully introduced to prepare hydrogen storage materials [5-8]
The starting mixture of MgH2-2 mol% nano-Ni shows the presence of microcrystalline magnesium hydride and Ni nanoparticles

Summary

Introduction

Magnesium has the theoretically highest weight capacity for hydrogen storage (7.6wt.%), lightweight and a reasonably low cost 1. High working temperature (>300°C), slow reaction kinetics (need more than 1 hour to produce 5 wt% of hydrogen) and difficult activation limit the practical application of Mg-based hydrides. Many efforts have been done to improve the hydriding and dehydriding properties such as element substitution (metal or metal oxides) as catalyst in nanometer scale and modification of ball milling technique have been used to improve sorption and kinetics properties [2-4]. The reactive ball milling under hydrogen atmosphere was successfully introduced to prepare hydrogen storage materials [5-8]. We report on MgH2 catalyzed with small amount of Ni in nanoparticles scale and the preparation was done by reactive ball milling under 10 bar hydrogen. Hydrogen sorption properties were studied by gravimetric analysis in a wide temperature range for absorption (50-300 °C) and desorption (250-350 °C)

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Conclusion