Nanolayer-like-shaped MgFe(2)O(4) synthesised via a simple hydrothermal method and its catalytic effect on the hydrogen storage properties of MgH(2).
Nanolayer-like-shaped MgFe(2)O(4) synthesised via a simple hydrothermal method and its catalytic effect on the hydrogen storage properties of MgH(2).
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DOI：
10.1039/c8ra02168f
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发表时间：
2018-04-23
期刊：
影响因子：
3.9
通讯作者：
Ismail, M.
中科院分区：
文献类型：
--
作者：
Ali, N. A.;Idris, Nurul Hayati;Din, M. F. Md;Mustafa, N. S.;Sazelee, N. A.;Yap, F. A. Halim;Sulaiman, N. N.;Yahya, M. S.;Ismail, M.
本文研究了水热法合成的纳米层状MgFe 2 O 4对MgH 2储氢性能的影响。采用球磨法制备MgH 2 + 10wt%MgFe2O4。掺杂MgFe 2 O 4的MgH 2样品分别在比研磨的和纯MgH 2低约250 °C、90 °C和170 °C下开始释放H2。在320 °C下，等温解吸动力学研究已经显示掺杂样品在10分钟内解吸了约4.8重量%的出，而研磨的MgH 2解吸了小于1.0重量%的出。对于等温吸收动力学，掺杂样品可以在200 °C下在10分钟内吸收约5.5重量%的H2。同时，未掺杂的样品在相同条件下仅吸收4.0wt%的H2。掺杂10wt%MgFe2O4的MgH 2复合材料的活化能为99.9 kJ mol-1，与研磨的MgH 2（133.0 kJ mol-1）相比，其显示出降低了33.1 kJ mol-1。X射线衍射分析表明，MgFe 2 O 4掺杂的MgH 2体系在脱氢过程中形成了新的物种Fe和MgO，这些新物种被认为是真实的催化剂，通过协同催化作用对MgFe 2 O 4掺杂的MgH 2体系的吸附性能起到了至关重要的作用。纳米层状MgFe 2 O 4-添加MgH 2复合材料的去/吸收性能的改善相比，未掺杂的MgH 2。
In this study, the effect of nanolayer-like-shaped MgFe2O4 that is synthesised via a simple hydrothermal method on the performance of MgH2 for hydrogen storage is studied. MgH2 + 10 wt% MgFe2O4 is prepared by using the ball milling method. The MgFe2O4-doped MgH2 sample started to release H2 at approximately 250 °C, 90 °C and 170 °C lower than the milled and pure MgH2 respectively. At 320 °C, the isothermal desorption kinetic study has shown that the doped sample has desorbed approximately 4.8 wt% H2 in 10 min while the milled MgH2 desorbed less than 1.0 wt% H2. For isothermal absorption kinetics, the doped sample can absorb approximately 5.5 wt% H2 in 10 min at 200 °C. Meanwhile, the undoped sample absorbs only 4.0 wt% H2 in the same condition. The activation energy of 10 wt% MgFe2O4-doped MgH2 composite is 99.9 kJ mol−1, which shows a reduction of 33.1 kJ mol−1 compared to the milled MgH2 (133.0 kJ mol−1). X-ray diffraction spectra display the formation of new species which are Fe and MgO after dehydrogenation, and these new species are believed to act as the real catalyst that plays a crucial role in improving the sorption performance of the MgFe2O4-doped MgH2 system by providing a synergetic catalytic effect. The nanolayer-like-shaped MgFe2O4-added MgH2 composite showed an improvement in de/absorption properties compared to that of un-doped MgH2.
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影响因子：
5.4
作者：
Aguey-Zinsou, K. -F.;Fernandez, J. R. Ares;Bormann, R.
通讯作者：
Bormann, R.
影响因子：
9.2
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
10.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Roennebro, Ewa