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您的检索式：作者名="F.A.Halim Yap"
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| 1 | The effect of K2SiF6 on the MgH2 hydrogen storage properties显示文摘The catalytic effect of K2SiF6 on MgH2 was first timely studied.The MgH2+5 wt.%K2SiF6 was prepared via the ball milling technique.The catalyst had lessened the initial decomposition temperature by 134℃ and 48℃ as compared to both pristine and milled MgH2 samples,respectively.In 2 minutes,4.5 wt.%of hydrogen was absorbed(250℃)by the doped composite,which was 0.8 wt.%higher than the milled MgH2.Meanwhile,for the desorption kinetics(320℃,1 atm),the amount of desorbed hydrogen was increased by 2.4 wt.%and 2.3 wt.%for the first 10 and 20 minutes.Besides,contracting volume and Johnson-Mehl-Avrami models were used to analyse the kinetics sorptions.The decomposition activation energy calculated based on Kissinger equation was 114 kJ/mol.As for the active species,Mg2Si,MgF2 and KH were formed during the heating process.These active species are speculated to be responsible for the improvement of the hydrogenation properties of the composite. | M.Ismail M.S.Yahya N.A.Sazelee N.A.Ali F.A.Halim Yap N.S.Mustafa | 2020 | Journal of Magnesium and Alloys2020，8，3： | 6 |
| 2 | Improved hydrogen storage properties of MgH_2 catalyzed with K_2NiF_6显示文摘In this study, the hydrogen storage properties of MgH_2-X wt% K_2NiF_6(X = 5, 10, 15, 20, and 50) were investigated for the first time. From the analysis of the onset desorption temperature and isothermal de/absorption kinetics, it was shown that MgH_2+ 5 wt% K_2NiF_6sample has the best performance. The 5wt% doped sample started to release hydrogen at about 260 °C, which was a reduction of about 95 °C and 157 oC compared with the as-milled and as-received MgH_2. In addition, the de/absorption kinetics of the MgH_2+ 5 wt% K_2NiF_6 were also improved significantly compared to the un-doped MgH_2. The apparent activation energy for hydrogen desorption exhibited the decrement from 167.0 k J/mol for as-milled MgH_2 to 111.0 k J/mol with the addition of 5 wt% K_2NiF_6. Moreover, the X-ray diffraction spectra displayed the formation of new phases of KF, KH, Mg_2Ni and Mg_2NiH_4 by doping the K_2NiF_6with MgH_2 after the dehydrogenation and rehydrogenation processes. The scanning electron microscope results revealed that MgH_2 doped with 5 wt% K_2NiF_6demonstrated the smallest particle size compared to the as-received and as-milled MgH_2. It is believed that the formation of in situ active species of KF, KH, and Mg_2Ni could provide a synergetic catalytic effect in enhancing the hydrogen sorption properties of MgH_2. | N.N.Sulaiman N.Juahir N.S.Mustafa F.A.Halim Yap M.Ismail | 2016 | Journal of Energy Chemistry2016，25，5： | 5 |
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