Hydrogen generation via hydrolysis of ball milled WE43 magnesium waste

Bacha, S. Al; Awad, A.S.; Asmar, El; Tayeh, Toufic; Bobet, Jean-Louis; Nakhl, M.; Zakhour, M.

doi:10.1016/j.ijhydene.2019.05.123

Cited by 42 publications

(17 citation statements)

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“…The addition of 5 wt.% of 2 additives (Graphite and Nickel) was found to enhance Mg [23] and WE43 [13] The same phenomenon was observed in a previous work [13]. Adding AlCl3 reduces particles size and favor cracks formation (section 3.4) and graphite may form a fine protective layer on the fresh surface [13,23].…”

Section: Synergetic Effect Of Graphite and Alcl3supporting

confidence: 69%

“…. This phenomenon may be attributed to the lubricant effect of graphite [13,23]. It is worth pointing out that increasing graphite content up to 10 wt.% does not change the crystallite size variation and consequently the materials reactivity.…”

Section: Graphite Additionmentioning

confidence: 89%

“…The chlorides were stored in a glove box to avoid hydration. Based on our previous studies [13,23], we have adopted the addition of 5 wt. % of additives (i.e.…”

Section: Ball Millingmentioning

confidence: 99%

“…Ball milling with 5 wt. % of graphite improves the hydrolysis performance of Mg [23] and WE43 magnesium waste [13]. The effect of ball milling with graphite on the hydrolysis performance of Mg17Al12 was investigated by varying ball milling time (i.e.…”

Section: Graphite Additionmentioning

confidence: 99%

“…high purity) are recycled to secondary ingots [5,6]. It has been shown that other magnesium-based alloy wastes can be used to generate H2 by the hydrolysis reaction [7][8][9][10][11][12][13]. Hydrolysis with magnesium-based materials is an electrochemical reaction where Mg is oxidized to Mg 2+ (i.e.…”

Section: Introductionmentioning

confidence: 99%

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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: Synergetic Effect Of Graphite and Alcl3supporting

confidence: 69%

Section: Graphite Additionmentioning

confidence: 89%

“…The chlorides were stored in a glove box to avoid hydration. Based on our previous studies [13,23], we have adopted the addition of 5 wt. % of additives (i.e.…”

Section: Ball Millingmentioning

confidence: 99%

Section: Graphite Additionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Supra Hydrolytic Catalysis of Ni₃Fe/rGO for Hydrogen Generation

et al. 2022

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Light metal hydrolysis for hydrogen supply is well suited for portable hydrogen fuel cells. The addition of catalysts can substantially aid Mg hydrolysis. However, there is a lack of clear catalytic mechanism to guide the design of efficient catalysts. In this work, the essential role of nanosized catalyst (Ni3Fe/rGO) in activating micro‐sized Mg with ultra‐rapid hydrolysis process is investigated for the first time. Here, an unprecedented content of 0.2 wt% Ni3Fe/rGO added Mg can release 812.4 mL g−1 hydrogen in just 60 s at 30 °C. Notably, an impressive performance with a hydrogen yield of 826.4 mL g−1 at 0 °C in only 30 s is achieved by the Mg‐2 wt% Ni3Fe/rGO, extending the temperature range for practical applications of hydrolysis. Moreover, the four catalysts (Ni3Fe/rGO, Ni3Fe, Ni/rGO, Fe/rGO) are designed to reveal the influence of composition, particle size, and dispersion on catalytic behavior. Theoretical studies corroborate that the addition of Ni3Fe/rGO accelerates the electron transfer and coupling processes and further provides a lower energy barrier diffusion path for hydrogen. Thus, a mechanism concerning the catalyst as migration relay is proposed. This work offers guidelines designing high‐performance catalysts especially for activating the hydrolysis of micro‐sized light weight metals.

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