Room temperature hydrogen absorption by Mg and Mg TiFe nanocomposites processed by high-energy ball milling

Silva, Rafael Á.; Neto, Ricardo Mendes Leal; Leiva, Daniel Rodrigo; Ishikawa, Tomaz Toshimi; Kiminami, Cláudio Shyinti; Jorge, Alberto Moreira; Filho, Walter José Botta

doi:10.1016/j.ijhydene.2018.04.174

Cited by 33 publications

(13 citation statements)

References 38 publications

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“…Figure 2a presents a DSC scan where the hydrogen desorption peak can be observed at around 326 °C. Although reactive milling results in only partial hydrogenation of the alloy, it is interesting to note that the peak temperature (326 °C) and the onset temperature of 286 °C for hydrogen desorption are lower than those for commercial magnesium hydride (MgH2) which are roughly on average 426 °C and 442 °C, respectively [28][29][30][31][32][33][34][35][36]. Figure 2b displays the TG curve from which one obtained the value of 0.87 wt% of hydrogen absorbed in the alloy by reactive milling.…”

Section: Thermal Analysis Of the Reactive Milled Samplesmentioning

confidence: 99%

Hydrogen storage in MgAlTiFeNi high entropy alloy

Cardoso

Roche

Jorge

et al. 2021

Journal of Alloys and Compounds

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In this study, the MgAlTiFeNi high entropy alloy was processed by high-energy ball milling under both argon and hydrogen atmospheres. It is shown that this alloy forms a body-centered cubic (BCC) structure when milled under an argon atmosphere (mechanical alloying-MA) and a combination of BCC, FCC, and Mg2NiH4 when milled under hydrogen pressure (reactive milling-RM). The hydrogen storage behavior of the RM samples was evaluated by a combination of thermal analyses and manometric measurements in a Sieverts apparatus. The RM alloy presented a functional hydrogen storage capacity of 0.94 wt% and a very high hydrogen absorption and desorption kinetics at temperatures 100 °C lower than the one for the desorption temperature of the commercial MgH2. Electrochemical discharge of RM samples showed precisely the same hydrogen contend as that obtained in the gas desorption. Electrochemical charging/discharging experiments also were performed in the MA samples, which, however, presented lower electrochemical storage capacity, a behavior probably resulting from the instability of the alloy in the alkaline solution with the formation of a hydroxide layer on its surface that hinders the electrochemical reactions.

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Section: Thermal Analysis Of the Reactive Milled Samplesmentioning

confidence: 99%

Hydrogen storage in MgAlTiFeNi high entropy alloy

Cardoso

Roche

Jorge

et al. 2021

Journal of Alloys and Compounds

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“…24 For instance, an investigation into the catalytic effect of 40 wt % TiFe doped Mg has been reported. 25 The result shows that the composite can absorb about 3 wt % H 2 in 2 h at room temperature, and reversibly desorb the hydrogen starting from temperatures above 280 °C. Also, the effects of TiF 3 , TiCl 3 , TiO 2 , TiN, and TiH 2 on hydrogen sorption kinetics of Mg/MgH 2 were compared by Wang et al 24 and it was reported that TiF 3 has the best doping effects because 3.8 wt % H 2 can be absorbed within 30 s for the milled MgH 2 -4 mol % TiF 3 at 150 °C leading to the absorption rate being 10 times higher than pure MgH 2 .…”

Section: Introductionmentioning

confidence: 94%

Room Temperature Hydrogen Absorption of Mg/MgH₂ Catalyzed by BaTiO₃

et al. 2021

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This paper seeks to present notable insights into the catalytic behavior of a ferroelectric BaTiO3 nanomaterial at the boundary plane in the separation of MgH2 starting from 185 °C. The synergy between mechanical milling and enhanced electronic distribution at the surface of BaTiO3 aided magnesium to a remarkable absorption of 4.5 wt % H2 at room temperature under 30 bar within 20 h. The composite released H2 ∼ 5.7 wt % in 15 min at 310 °C and ∼5.1 wt % in 90 min at 250 °C. The lowered activation energy of decomposition was calculated to be ∼60 kJ/mol with a decomposition enthalpy of 72.3 kJ/mol-H2. The composite reversibly produced ∼5.7 wt % H2 across 20 cycles in less than 120 h at 300 °C. As revealed by detailed experimental results, the interplay between +4 and +3 states of titanium at “111” twin boundaries of BaTiO3, and the formation of oxygen vacancies, play an important role in improving the sorption kinetics and the reversibility of Mg/MgH2. Meanwhile, the anomalous ferroelectric character of the +2 state of barium around Ti–O and Mg after milling of BaTiO3 is also believed to slightly enhance MgH2 desorption enthalpy via a chemisorption process. Our findings have brought MgH2 a few steps closer to practical applications.

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“…After hydrogen absorption, TiFe particles become more refined and uniform. In addition, the presence of free Fe is also found, which promotes the good kinetic properties of Mg+TiFe [21d] . Ternary alloy TiFe 0.8 Mn 0.2 is also used to improve the hydrogen storage performance of MgH 2 .…”

Section: Catalyst Dopingmentioning

confidence: 99%

Review on Hydrogen Storage Performance of MgH₂: Development and Trends

2021

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Hydrogen storage technology is related to the process of hydrogen energy market. Efficient and safe hydrogen storage materials have always been the goal pursued by people. In the past few years, oceans of materials for hydrogen storage have been researched, MgH2 is considered to be one of the most potential hydrogen storage materials due to its high hydrogen storage capacity, good reversibility and price advantage. However, its development has been limited by its good thermodynamic stability and slow dehydrogenation kinetics. In this paper, the improvement of hydrogen storage performance of MgH2 is summarized from catalyst doping, MgH2 nanosizing, alloying and the construction of composite system. In particular, catalyst doping and MgH2 nanosizing will be more effective modification strategies. With the development of nanotechnology, monatomic catalyst will also become a research hotspot. In view of the changes in thermodynamic properties caused by the nanofabrication of MgH2, the loadless freestanding nano MgH2 will undoubtedly receive more attention.

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Room temperature hydrogen absorption by Mg and Mg TiFe nanocomposites processed by high-energy ball milling

Cited by 33 publications

References 38 publications

Hydrogen storage in MgAlTiFeNi high entropy alloy

Hydrogen storage in MgAlTiFeNi high entropy alloy

Room Temperature Hydrogen Absorption of Mg/MgH₂ Catalyzed by BaTiO₃

Review on Hydrogen Storage Performance of MgH₂: Development and Trends

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Room temperature hydrogen absorption by Mg and Mg TiFe nanocomposites processed by high-energy ball milling

Cited by 33 publications

References 38 publications

Hydrogen storage in MgAlTiFeNi high entropy alloy

Hydrogen storage in MgAlTiFeNi high entropy alloy

Room Temperature Hydrogen Absorption of Mg/MgH2 Catalyzed by BaTiO3

Review on Hydrogen Storage Performance of MgH2: Development and Trends

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Room Temperature Hydrogen Absorption of Mg/MgH₂ Catalyzed by BaTiO₃

Review on Hydrogen Storage Performance of MgH₂: Development and Trends