A study of hydrogen generation by reaction of an activated Mg–CoCl 2 (magnesium–cobalt chloride) composite with pure water for portable applications

Sun, Qian; Zou, Meishuai; Guo, Xiaoyan; Yang, Rongjie; Huang, Han-Liang; Huang, Peng; He, Xiangdong

doi:10.1016/j.energy.2014.11.016

Cited by 49 publications

(15 citation statements)

References 24 publications

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“…Mg and Mg17Al12) has to be studied separately. The hydrolysis of Mg have been widely reported [18][19][20][21][22][23][24][25][26][27][28] whereas the "Mg17Al12 -H2" subject is not sufficiently investigated. Previous studies have shown that Mg17Al12 can be used for hydrogen storage [29][30][31][32] while the production of hydrogen by the hydrolysis reaction has never been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of ball milling in presence of additives (Graphite, AlCl3, MgCl2 and NaCl) on the hydrolysis performances of Mg17Al12

Bacha

Zakhour²,

Nakhl³

et al. 2020

International Journal of Hydrogen Energy

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In most of the Mg-Al alloys, Al forms with Mg the intermetallic compound Mg17Al12. In order to understand the hydrogen production from the Mg-Al alloys waste by the hydrolysis reaction in "model" seawater (i.e. 3.5 wt. % NaCl), hydrolysis with Mg17Al12 was investigated. The effect of ball milling time, the nature of the additives (graphite, NaCl, MgCl2 and AlCl3) and the synergetic effects of both graphite and AlCl3 were investigated. It has been established that increasing ball milling time up to 5h is necessary to activate the intermetallic and to decrease sufficiently its crystallites and particles size. On one hand, the presence of AlCl3 provides the best hydrolysis performance (14 % of the theoretical hydrogen volume in 1h). On the other hand, the mixture obtained by simultaneous addition of graphite and AlCl3 shows the best hydrolysis performances with 16% of the theoretical H2 volume reached in 1h.

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Section: Introductionmentioning

confidence: 99%

Effect of ball milling in presence of additives (Graphite, AlCl3, MgCl2 and NaCl) on the hydrolysis performances of Mg17Al12

Bacha

Zakhour²,

Nakhl³

et al. 2020

International Journal of Hydrogen Energy

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“…On the other hand, the higher the specific surface, the faster the reaction rate and the greater the yield. A widely used technique to nanostructure materials is mechanical milling [8,15,16,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. The combination of cold welding and fracture produces homogeneous materials with small particles, high specific surface area and a microstructure that favors the hydrolysis reaction [37].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Mg for hydrogen production by hydrolysis obtained by MgH2 milling and dehydriding

Pighin

Urretavizcaya

Bobet

et al. 2020

Journal of Alloys and Compounds

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The synthesis, characterization and hydrolysis properties of nanostructured MgH2 and Mg in a 0.6 M MgCl2 aqueous solution are reported. The microstructural properties of commercial MgH2 are modified by mechanical milling without additives under H2 atmosphere for 5 h. The nanostructured Mg is obtained by dehydriding the as-milled MgH2 under vacuum at 355 °C for 2.5 h. The as-milled MgH2 shows average hydrolysis properties with good hydrogen production capacity (1390 mL/g H2) and kinetics (50% of the total yield in 2.3 min). The nanostructured Mg exhibits excellent hydrolysis properties with a high yield (910 mL/g H2), fast kinetics (90% of the total yield in 2.6 min) and practically no effect of a MgO/Mg(OH)2 passivating layer. The hydrolysis properties of both materials are attributed to their morphology and microstructure. The activation energies of the reaction are estimated and the mechanisms are discussed.

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“…The hydrogen generation amount and reaction rate are effectively improved by varying the properties of water. Owing to the formation of a galvanic cell, Mg─CoCl 2 , Mg─AlCl 3 , and Mg─FeCl 3 , prepared by ball milling could rapidly react with water and exhibit a high conversion and hydrogen generation rate during the first minute. Hydrogen is produced by the reaction of Al foil with water in NaCl + CuSO 4 solution through the contact corrosion effect between Al and Cu .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of the fresh Co, Ni, and anion ions on aluminum or magnesium with water reactions

et al. 2018

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Summary To analyze the effect of Co and Ni on hydrogen generation in water, the reactions of Mg and Al with water in CoCl2 and NiCl2 solutions are studied in terms of amount of H2 produced and rate of reaction. Mg rapidly reacts with water in CoCl2 and NiCl2, producing high amount of H2 without induction time. While there is a short induction time is detected for Al─H2O reaction in CoCl2 and NiCl2. In addition to the galvanic cell behavior of the Mg (Al)/Co (Ni) compounds formed, Co and Ni catalyze the hydrogen production reaction; however, the agglomeration of Co or Ni leads to a noticeable decrease in H2 production. The open‐circuit potential in CoCl2 and NiCl2 solutions after the addition of Mg or Al at ambient temperature shows an obvious change, coinciding with the initiation of the hydrogen generation process. Mg rapidly reacts with water in Co (Ac)2, CoSO4, Ni (Ac)2 and NiSO4 solutions as a consequence of its intrinsic metallic properties and of the formation of Co or Ni. The hydrogen production amount is lower (<200 ml g−1) in Co (NO3)2 and Ni (NO3)2, even after adding NaCl. No reaction occurs when adding Al in CoSO4, Co (Ac)2, Co (NO3)2, NiSO4, Ni (Ac)2, and Ni (NO3)2. The synergistic effect of Co, Ni, and anion ions in water affects the rate of Al or Mg corrosion and hydrogen generation.

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A study of hydrogen generation by reaction of an activated Mg–CoCl 2 (magnesium–cobalt chloride) composite with pure water for portable applications

Cited by 49 publications

References 24 publications

Effect of ball milling in presence of additives (Graphite, AlCl3, MgCl2 and NaCl) on the hydrolysis performances of Mg17Al12

Effect of ball milling in presence of additives (Graphite, AlCl3, MgCl2 and NaCl) on the hydrolysis performances of Mg17Al12

Nanostructured Mg for hydrogen production by hydrolysis obtained by MgH2 milling and dehydriding

Synergistic effect of the fresh Co, Ni, and anion ions on aluminum or magnesium with water reactions

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