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Issue 75, 2015
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Improved hydrogen storage properties of MgH2 by addition of Co2NiO nanoparticles

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Abstract

A sample of MgH2 and 10 wt% Co2NiO was prepared by the ball milling technique. The hydrogen storage properties and reaction mechanism of the sample were examined. The temperature-programmed desorption result shows that the addition of 10 wt% Co2NiO to MgH2 exhibited a lower onset desorption temperature of 300 °C, which was decreased to 117 and 70 °C compared to as-received and as-milled MgH2, respectively. The de/rehydrogenation kinetics of MgH2 + 10 wt% Co2NiO showed improvement compared to un-doped MgH2. The results of the Kissinger plot shows that the activation energy for the hydrogen desorption of MgH2 was reduced to about 65.0 and 15.0 kJ mol−1 compared to as-received and as-milled MgH2, respectively. Meanwhile, the X-ray diffraction analysis shows the formation of a new phase of Mg–Co alloy and Co1.29Ni1.71O4 after the dehydrogenation and rehydrogenation process. It is reasonable to conclude that the Co2NiO additive plays a catalytic role through the formation of active species of Mg–Co alloy and Co1.29Ni1.71O4 during the heating process, thus improving the hydrogen storage properties of MgH2.

Graphical abstract: Improved hydrogen storage properties of MgH2 by addition of Co2NiO nanoparticles

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Publication details

The article was received on 20 apr. 2015, accepted on 06 júl. 2015 and first published on 08 júl. 2015


Article type: Paper
DOI: 10.1039/C5RA07094E
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RSC Adv., 2015,5, 60983-60989

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    Improved hydrogen storage properties of MgH2 by addition of Co2NiO nanoparticles

    N. Juahir, N. S. Mustafa, A. M. Sinin and M. Ismail, RSC Adv., 2015, 5, 60983
    DOI: 10.1039/C5RA07094E

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