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Issue 16, 2016
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Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

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Abstract

The effects of Na3FeF6 catalyst on the hydrogen storage properties of MgH2 have been studied for the first time. The results showed that for the MgH2 sample doped with 10 wt% Na3FeF6, the onset dehydrogenation temperature decreased to 255 °C, which was 100 °C and 162 °C lower than those of the as-milled and as-received MgH2 sample, respectively. The re/dehydrogenation kinetics were also significantly enhanced compared to the un-doped MgH2. The absorption kinetics showed that the as-milled MgH2 only absorbed 3.0 wt% of hydrogen at 320 °C in 2 min of rehydrogenation, but about 3.6 wt% of hydrogen was absorbed within the same period of time after 10 wt% Na3FeF6 was added to MgH2. The desorption kinetics showed that the MgH2 + 10 wt% Na3FeF6 sample could desorb about 3.8 wt% of hydrogen in 10 min at 320 °C. In contrast, the un-doped MgH2 sample desorbed only 0.2 wt% of hydrogen in the same period of time. The activation energy for the decomposition of the as-milled MgH2 was 167.0 kJ mol−1, and this value decreased to 75.0 kJ mol−1 after the addition of 10 wt% Na3FeF6 (a reduction by about 92.0 kJ mol−1). It is believed that the in situ formation of the active species of NaMgF3, NaF and Fe during the heating process could enhance the hydrogen storage properties of MgH2, due to the catalytic effects of these new species.

Graphical abstract: Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

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Publication details

The article was received on 11 jan. 2016, accepted on 06 mar. 2016 and first published on 08 mar. 2016


Article type: Paper
DOI: 10.1039/C6DT00068A
Dalton Trans., 2016,45, 7085-7093

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    Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

    N. N. Sulaiman, N. S. Mustafa and M. Ismail, Dalton Trans., 2016, 45, 7085
    DOI: 10.1039/C6DT00068A

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