Crystal structure, phase stoichiometry and chemical environment of MgxNbyOx+y nanoparticles and their impact on hydrogen storage in MgH2

Pukazhselvan, D.; Otero‐Irurueta, Gonzalo; Pérez, J.; Singh, Budhendra; Bdikin, Igor; Singh, Manoj K.; Fagg, Duncan P.

doi:10.1016/j.ijhydene.2016.04.029

Cited by 27 publications

(15 citation statements)

References 31 publications

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“…The observations explored above reveal that pure Fe is ab etter additivet han all other additives of the present study, both for MgH 2 and MgH 2 /Mg 2 FeH 6 composites. Regarding the catalytic reaction mechanism,o ur recent previous studies [6,29,30] suggested ad iffusion barrier cracking mechanism, based on the evolution of new in situ products in the Nb 2 O 5 loaded MgH 2 system. Although it is difficult to generalize on the role of metal oxide additives with the present additive Fe, we believe that the Fe additive helps to decrease the hydrogen diffusion pathways by fragmentation of particles for the improved dehydrogenation of MgH 2 ,r ather than any intrinsic catalytic effect offered by the formed mixed metal phase Mg 2 FeH 6 .I n the literature, [18,19,21] the mechanism of Fe addition to MgH 2 has been explained by variousr esearchers on the basis of substitutionm odels.…”

Section: Resultsmentioning

confidence: 99%

Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe−C, and Fe−Mg Additives

et al. 2016

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This study highlights that Fe additives offer better catalytic properties than carbon, Fe-C (iron carbide/carbon composites), and Fe-Mg (Mg FeH ) additives for the low-temperature dehydrogenation of magnesium hydride. The in situ X-ray diffraction measurements prove the formation of a Mg FeH phase in iron additive loaded MgH . Nonetheless, differential scanning calorimetry data suggest that this Mg FeH phase does not have any influence on dehydrogenation properties of MgH . On the other hand, the composite system Mg FeH /MgH shows significantly improved dehydrogenation properties even in absence of further additives. It is suggested that the improved system performance of Fe loaded MgH is attributed to restrictions on crystal growth of MgH and the catalytic behavior of Fe nanoparticles, rather than any intrinsic catalytic properties offered by the formed mixed metal phase Mg FeH .

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Section: Resultsmentioning

confidence: 99%

Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe−C, and Fe−Mg Additives

et al. 2016

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“…As shown in Figure 8 , Mg 3 NbO 11 is formed after the reduction at 1203 K for 2 h. The results show that the oxygen content of 1203 K reduced niobium powder after pickling is higher than 1133 K reduced niobium powder 15 , 24 – 26 . The oxygen content of niobium powder is significantly affected by the reduction temperature, reduction time, and magnesium content.…”

Section: Resultsmentioning

confidence: 88%

Effect of magnesium reduction on the oxygen content of pickling niobium powder

Wang

Zhang²,

Liu

et al. 2021

Sci Rep

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Considering the problem of high oxygen content in industrial niobium powder, the oxygen reduction of high oxygen niobium powder with the addition of magnesium is studied. Based on the thermodynamic analysis of magnesium thermal reduction of niobium powder, the effects of reduction temperature, magnesium addition, reduction time, and reduction atmosphere on the oxygen content of pickling niobium powder are studied. The results show that with an increase in the magnesium addition, the oxygen content of pickling niobium powder gradually decreases to a certain value, and then remains unchanged. In a certain temperature range (953–1203 K), with an increase in the reduction temperature, the oxygen content of pickling niobium powder first decreases, and then increases; the best oxygen content is 356 ppm at 1133 K. With the extension in reduction time (2–6 h), the oxygen content of pickling niobium powder first decreases, and then remains unchanged. Finally, the oxygen content of pickled niobium powder is reduced to approximately 356 ppm at 400% magnesium addition at 1133 K for 4 h.

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“…Therefore, the reduction process is optimized as follows: 1133 K reduction temperature, 400% excess magnesium addition for 4 h, and the oxygen content of acid washed niobium powder is as low as 356 ppm. It can be seen from Figure 8 that magnesium niobate mg3nbo11 is formed after reduction at 1203 K for 2 h. As a result, the oxygen content of 1203 K reduced niobium powder after pickling is higher than that of 1133 K reduced niobium powder [24][25][26]. It is known from that reduction temperature, reduction time and magnesium addition all have great influence on oxygen content of pickling niobium powder.…”

Section: Effect Of Reduction Temperature and Time On Oxygen Content Of Pickling Niobium Powdermentioning

confidence: 96%

Effect of Magnesium Reduction Process on Oxygen Content of Pickling Niobium Powder

Wang

Liu

Zhang

et al. 2021

Preprint

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Aiming at the problem of high oxygen content in industrial niobium powder, the oxygen reduction process of high oxygen niobium powder magnesium was studied. Based on the thermodynamic analysis of magnesium thermal reduction of niobium powder, the effects of reduction temperature, magnesium addition, reduction time and reduction atmosphere on oxygen content of pickling niobium powder were studied. The results show that: with the increase of magnesium addition, the oxygen content of pickling niobium powder gradually decreases to a certain value and then remains unchanged. In a certain temperature range (953k-1203k), with the increase of reduction temperature, the oxygen content of pickling niobium powder first decreases and then increases, and the best oxygen content is 356ppm at 1133k; with the extension of reduction time (2-6h), the oxygen content of pickling niobium powder first decreases and then remains unchanged. Finally, the oxygen content of pickled niobium powder is reduced to about 356 ppm at 400% Mg addition, 1133 K reduction temperature and 4 h reduction time.

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Crystal structure, phase stoichiometry and chemical environment of MgxNbyOx+y nanoparticles and their impact on hydrogen storage in MgH2

Cited by 27 publications

References 31 publications

Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe−C, and Fe−Mg Additives

Dehydrogenation Properties of Magnesium Hydride Loaded with Fe, Fe−C, and Fe−Mg Additives

Effect of magnesium reduction on the oxygen content of pickling niobium powder

Effect of Magnesium Reduction Process on Oxygen Content of Pickling Niobium Powder

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