Hydrogenation thermodynamics of melt-spun magnesium rich Mg–Ni nanocrystalline alloys with the addition of multiwalled carbon nanotubes and TiF3

Hou, Xiaojiang; Hu, Rui; Zhang, Tiebang; Kou, Hongchao; Li, Jinshan

doi:10.1016/j.jpowsour.2015.12.050

Cited by 73 publications

(18 citation statements)

References 57 publications

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“…Thus no significant loss of hydrogen capacity is detected. Moreover, the phenomenon of hydrogen trapping by lattice defects, such as grain/phase boundaries and dislocations [47,48] cannot be evidenced due to the experimental resolution. To understand the kinetics mechanism behind this two-stage hydrogen absorption, two general kinetic models, Jonhson-Mehl-Avrami-Kolomogorov (JMAK) model [49] and Jander model [50], have been used to fit the isothermal data.…”

Section: Microstructure Analysis Of the Cold Forged (Cf) Samplementioning

confidence: 99%

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Wen

Rango

Allain-Bonasso

et al. 2020

Journal of Power Sources

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Different fast forging processes are used for microstructure optimization in an attempt to improve hydrogen storage in Mg-based composites obtained from a mixture of Mg-22 wt.% Ni powders.First, fast forging is employed at room temperature to change the amount of structural defects, produce fine grains and modify crystallographic textures. The effects of such microstructure modifications (including the exact nature of phases) on the H-storage behavior are investigated.A Mg {0001} basal fiber texture develops upon fast cold forging, which facilitates the initial activation of hydrogenation while, owing to the high stability of the MgH 2 hydride, the kinetics of desorption remains rather slow. Second, to promote hydrogen desorption, forging is conducted at elevated temperature to form Mg 2 Ni phase. Interestingly, for this sample, faster desorption is recorded while slower absorption kinetics is obtained due to the occurrence of dynamic recrystallization inducing weaker texture and lower amount of structural defects. Third, annealing followed by cold forging is used to produce a microstructure consisting of fragmented Mg 2 Ni lamellae embedded in a textured Mg-matrix. Using this third approach, both hydrogen absorption and desorption kinetics are found to be markedly improved.

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Section: Microstructure Analysis Of the Cold Forged (Cf) Samplementioning

confidence: 99%

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Wen

Rango

Allain-Bonasso

et al. 2020

Journal of Power Sources

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“…All the bulk Mg‐M (M = Ni, Ce, and La) alloys are three‐dimensional interface reaction controlled process due to m values closed to 1.07. The hydrolysis process of HEBM Mg‐Ni alloys except for HEBM Mg30La alloy is dominated by the one‐dimensional diffusion reaction 85 . While, the H 2 production process of HEBM Mg‐30La alloy is dominated by a three‐dimensional interface reaction controlled reaction.…”

Section: Resultsmentioning

confidence: 99%

Comparative investigation on feasible hydrolysis H ₂ production behavior of commercial Mg‐M (M = Ni, Ce, and La) binary alloys modified by high‐energy ball milling—Feasible modification strategy for Mg‐based hydrogen producing alloys

et al. 2020

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The bulk Mg-M (M = Nickel [Ni], cerium [Ce], and Lanthanum [La]) alloys are successfully ameliorated by high-energy ball milling (HEBM) to modify the hydrolysis H 2 generation performance in simulated seawater solution (3.5 wt% NaCl). The H 2 generation kinetics, rate-limiting steps, thermodynamics and the hydrolysis mechanism are investigated by combining the fitting results of the hydrolysis curves and microstructures information. The results indicate that the as-cast Mg25Ni possesses higher generation capacity and faster initial rate. The capacities of as-cast Mg25Ni, Mg30Ce, and Mg30La alloys at 48 C within 180 minutes are 760 mL g −1 , 725 mL g −1 , and 525 mL g −1. The hydrolysis H 2 generation apparent activation energies of the as-cast Mg25Ni, Mg30Ce, and Mg30La alloys are 30.92, 17.05, and 28.04 kJÁmol −1 , respectively. The HEBM technique can elevate the hydrolysis performance of Mg-M alloys. And the highest H 2 producing capacity as high as 589 mL g −1 is obtained by HEBM Mg30La alloy at 48 C within 30 minutes. The hydrolysis apparent activation energies E a are 9.57, 14.65, and 23.88 kJ/mol for HEBM Mg25Ni, Mg30Ce, and Mg30La alloys. The initial rate and the final yield of H 2 generation for Mgbased alloys are affected by the activity of matrix alloy, microstructure, particle size, surface state, and many other factors. K E Y W O R D S H 2 production, HEBM, hydrogen generation mechanism, kinetics, Mg intermediate alloys 1 | INTRODUCTION Hydrogen is currently the most appealing option for fossil fuels in the future. The production of H 2 is the primary problem of hydrogen utilization. 1-5 The hydrogen-energy process chain is consisted by the hydrogen production 6 , hydrogen storage 7-10 and regeneration. 11-13 Nowadays, the wide usages of H 2 energy are still seriously prevented

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“…Some scholars added V, Cr, Ti and Mn into the Mg−Ni−H system to further weaken the metal hydrogen bond and reduce the stability of the hydride [85b,c] . X. Hou et al [85d] . reduced the enthalpy of dehydrogenation reaction by 2–4 kJ/mol by adding carbon nanotubes and TiF 3 to Mg 10 Ni, and the maximum hydrogen absorption was 6.52 wt %.…”

Section: Alloyingmentioning

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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Hydrogenation thermodynamics of melt-spun magnesium rich Mg–Ni nanocrystalline alloys with the addition of multiwalled carbon nanotubes and TiF3

Cited by 73 publications

References 57 publications

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Comparative investigation on feasible hydrolysis H ₂ production behavior of commercial Mg‐M (M = Ni, Ce, and La) binary alloys modified by high‐energy ball milling—Feasible modification strategy for Mg‐based hydrogen producing alloys

Review on Hydrogen Storage Performance of MgH₂: Development and Trends

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Hydrogenation thermodynamics of melt-spun magnesium rich Mg–Ni nanocrystalline alloys with the addition of multiwalled carbon nanotubes and TiF3

Cited by 73 publications

References 57 publications

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Improving hydrogen storage performance of Mg-based alloy through microstructure optimization

Comparative investigation on feasible hydrolysis H 2 production behavior of commercial Mg‐M (M = Ni, Ce, and La) binary alloys modified by high‐energy ball milling—Feasible modification strategy for Mg‐based hydrogen producing alloys

Review on Hydrogen Storage Performance of MgH2: Development and Trends

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Comparative investigation on feasible hydrolysis H ₂ production behavior of commercial Mg‐M (M = Ni, Ce, and La) binary alloys modified by high‐energy ball milling—Feasible modification strategy for Mg‐based hydrogen producing alloys

Review on Hydrogen Storage Performance of MgH₂: Development and Trends