Phase equilibria of Ce–Mg–Ni ternary system at 673 K and hydrogen storage properties of selected alloy

Wu, Kong-Bao; Luo, Qun; Chen, Shuanglin; Gu, Qinfen; Chou, Kuo‐Chih; Wang, Xun-Li; Li, Qian

doi:10.1016/j.ijhydene.2015.11.068

Cited by 28 publications

(5 citation statements)

References 46 publications

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“…[ 56 ] The lattice parameters, unit cell volumes, and the corresponding abundances of each phase are summarized in Table 1 . Combined with the ternary phase diagram, [ 57 ] the X‐ray diffraction (XRD) pattern of Mg10Ni alloy shown in Figure 3a is marked and the dominant phase is hexagonal close‐packed metallic Mg ( P63/mmc ) with JCPDS#89‐4244. The corresponding abundance of Mg is about 84.4%.…”

Section: Resultsmentioning

confidence: 99%

“…[56] The lattice parameters, unit cell volumes, and the corresponding abundances of each phase are summarized in Table 1. Combined with the ternary phase diagram, [57] the X-ray diffraction (XRD) pattern of Mg10Ni alloy Figure 3d shows the partially amplified diffraction patterns; it can be seen that the Bragg diffraction peaks corresponding to the Mg phase shift to low angles, indicating that the atoms of Ce dissolve into the lattice cells of Mg, leading to the expansion of crystal cells. According to the Bragg diffraction law, 2dsinθ ¼ nλ, it is determined that once the alloying elements dissolve into the lattice cell, the diffraction angle 2θ decreases and the crystal space d increases.…”

Section: Phase Compositions and Microstructuresmentioning

confidence: 99%

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H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

Bai

Cao

et al. 2022

Energy Tech

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To adjust the hydrolysis H2 generation properties of as‐cast Mg–10wt%Ni (Mg10Ni) alloy, intermediate alloys Mg–Ce and Mg–La are introduced to prepare Mg9Ni10Ce and Mg9Ni10La. The H2 generation thermodynamics are investigated based on microstructures, electrochemical polarization properties, and fitted information of hydrolysis curves by Avrami–Erofeev and Arrhenius equations. The results indicate that Ni/La/Ce alloying elements can modify the microstructures of the Mg matrix by forming active phases Mg2Ni and Mg12Ce or Mg17La2, phase boundaries, and α‐Mg solid‐solution. The H2 generation capacities of Mg10Ni, Mg9Ni10Ce, and Mg9Ni10La are 532, 511, and 444 mL g−1 with 0.63, 0.68, and 0.59 conversion yields in 2.5 h at 293 K in NaCl solution. The conversion yields of Mg10Ni, Mg9Ni10La, and Mg9Ni10Ce can be promoted to 0.88, 0.91 and 0.99 at 308 K with 741, 756 and 690 mL g−1 H2, respectively. Due to the high content of eutectic structure and active phase as well as the stronger electrochemical hydrolysis tendency, the modification effect of La is better than Ce. The microstructure–property relationship and thermodynamics built herein can provide an effective strategy to regulate Mg‐based alloys to achieve a high conversion yield and rapid rate by electrochemical hydrolysis H2 generation.

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Section: Resultsmentioning

confidence: 99%

Section: Phase Compositions and Microstructuresmentioning

confidence: 99%

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

Bai

Cao

et al. 2022

Energy Tech

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“…However, a new phase with fairly new diffracting pattern is observed in SAED3 which has not been reported before in MgNiCe system. 32,33) As shown in SAED3 pattern, five extra and uniformly distributed diffraction spots are obviously observed between two adjacent diffracting spots of Mg 12 Ce. The features are commonly adopted evidences proving the existence of the 18R type LPSO phase in MgTM (transition metals)RE systems.…”

Section: Microstructure Of As-cast Alloymentioning

confidence: 89%

Improved Absorption and Desorption Kinetics of Mg–Ni–Ce Alloy Activated under Elevated Hydrogen Pressure

Xie

2020

Mater. Trans.

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The large-scale application of Mg as a hydrogen storage material has been limited by its slow absorption and desorption kinetics at moderate temperatures. Refining the microstructures is an effective way to improve the hydrogen storage performance. Aiming at improving the de-/absorption kinetics of Mg-based alloys by in situ formed superfine catalysts, Mg7Ni4Ce (mass%) alloy has been prepared and activated by controlling the activation hydrogen pressure. The phase components, microstructure and hydrogen storage properties have been systematically investigated. It is found that an 18R-type long-period stacking ordered (LPSO) phase is formed in the eutectic region of as-cast MgCeNi ternary alloy. The observed LPSO structure is a variant of Mg 12 Ce rather than Mg. Abundant secondary phase particles are obtained in the asactivated alloy. For the sample which is activated at 300°C under 7.5 MPa hydrogen pressure, the particle size of secondary phase is much finer than that of the sample activated under 3 MPa hydrogen pressure. The sample activated under higher hydrogen pressure shows superior absorption and desorption kinetics.

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“…The anodic reaction of the above‐mentioned hydrolysis process is M g → M g 2+ + 2e − , and the cathodic reaction is H 2 O + 2e − → H 2 ↑ + OH − . It is proved that the H 2 production reaction of Mg can be seriously prevented by the by‐product of Mg(OH) 2 passive film bonded on the surface of Mg surface 51‐54 . So, modifying the Mg‐based alloys to achieve rapid H 2 production and high conversion yield is the focus of research on hydrolysis hydrogen production Mg‐based alloys.…”

Section: Introductionmentioning

confidence: 99%

“…It is proved that the H 2 production reaction of Mg can be seriously prevented by the by-product of Mg(OH) 2 passive film bonded on the surface of Mg surface. [51][52][53][54] So, modifying the Mg-based alloys to achieve rapid H 2 production and high conversion yield is the focus of research on hydrolysis hydrogen production Mg-based alloys.…”

mentioning

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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Phase equilibria of Ce–Mg–Ni ternary system at 673 K and hydrogen storage properties of selected alloy

Cited by 28 publications

References 46 publications

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

Improved Absorption and Desorption Kinetics of Mg–Ni–Ce Alloy Activated under Elevated Hydrogen Pressure

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

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Phase equilibria of Ce–Mg–Ni ternary system at 673 K and hydrogen storage properties of selected alloy

Cited by 28 publications

References 46 publications

H2 Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

H2 Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

Improved Absorption and Desorption Kinetics of Mg–Ni–Ce Alloy Activated under Elevated Hydrogen Pressure

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

Contact Info

Product

Resources

About

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

H₂ Production of As‐Cast Multialloying Mg‐Rich Alloys by Electrochemical Hydrolysis in NaCl Solution

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