Improvement on the kinetic and thermodynamic characteristics of Zr1-xNbxCo (x = 0–0.2) alloys for hydrogen isotope storage and delivery

Yao, Zhendong; Xiao, Xuezhang; Liang, Zipeng; Kou, Huaqin; Luo, Wenhua; Chen, Changan; Jiang, Lijun; Chen, Lixin

doi:10.1016/j.jallcom.2019.01.100

Cited by 53 publications

(27 citation statements)

References 35 publications

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“…Moreover, the ZrCo phase diagram and EDX analysis were used to ensure the accuracy of the results. The ZrCo reaction can easily form ZrCo 2 , Zr 6 Co 23 , and Zr 2 Co 11 phases below approximately 1800 K when the Co content is higher than 65 at%, 40,41 consistent with previous reports 15,19,24 . As shown in Figure 3E, the composition of the ZrV 0.24 Co 1.76 phase was confirmed by combining XRD and EDX spectroscopy.…”

Section: Resultssupporting

confidence: 89%

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Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Liang

Wang

et al. 2022

Intl J of Energy Research

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Summary To improve the kinetic properties of the ZrCo alloy, Zr50‐xVxCo50 (x = 0, 2.5, 3.5, and 5.0) samples were fabricated by vacuum arc‐melting. The effects of the V substitution on the microstructure, hydrogen absorption/desorption kinetics, cycling stability, and antidisproportionation properties of ZrCo were systematically investigated. X‐ray diffraction results show that the Zr50‐xVxCo50 (x = 2.5, 3.5, and 5.0) alloys consisted of ZrCo phase and ZrV0.24Co1.76 second phase. The lattice parameter and cell volume gradually decreased with the increase in the V content. The initial activation behavior was improved for the Zr50‐xVxCo50 (x = 2.5, 3.5, and 5.0) samples because of the catalytic effect of the ZrV0.24Co1.76 second phase. Additionally, the equilibrium pressure of hydrogen absorption increased and the plateau width decreased with the increase in the V content. To obtain thermodynamic and kinetic data, ΔH and Ea were calculated using the Van't Hoff equation and Kissinger equation. ΔH of the Zr50‐xVxCo50 (x = 0, 2.5, 3.5, and 5.0)‐H system was reduced from 90.12 to 72.52 kJ·mol−1, while Ea of ZrCoH3 decreased from 113.38 ± 4.2 to 94.13 ± 2.9 kJ·mol−1 for hydrogen desorption, which is beneficial for the hydrogenation/dehydrogenation reaction. Furthermore, the cycling stability and antidisproportionation properties were enhanced after the V addition, particularly for the Zr47.5V2.5Co50 alloy exhibiting an excellent initial activation behavior.

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Section: Resultssupporting

confidence: 89%

“…Elemental doping to optimize the properties of ZrCo has led to outstanding achievements. In terms of kinetic properties, Co replaced by Mn, Nb, Mo, and Fe largely reduces the activation time and increases the activation rate 15,18,19 . The temperature and pressure affect the hydriding/dehydriding kinetics of the ZrCo alloy 20‐22 .…”

Section: Introductionmentioning

confidence: 99%

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Liang

Wang

et al. 2022

Intl J of Energy Research

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“…The experimental results, after 50 hydrogen absorption and desorption cycles at 350 °C, are shown in Figure 2 c. The hydrogen storage capacity retention rate of the Zr 0.8 Nb 0.2 Co alloy is 68.5%, and it is much higher than that of the ZrCo alloy. From the point of view of thermodynamics, it can also be seen that the disproportionation energy of the new alloy increases from 147.8 kJ/mol for ZrCo to 182.1 kJ/mol for Zr 0.85 Nb 0.15 Co [ 69 ].…”

Section: Effects Of Element Substitution On Anti-disproportionatiomentioning

confidence: 99%

“…When the temperature is 583 K, after 50 hydrogen absorption–desorption cycles, the ultimate hydrogen storage capacity is shown in Figure 3 b: ZrCo 0.7 Ni 0.3 > ZrCo 0.8 Ni 0.2 > ZrCo > ZrCo 0.9 Ni 0.1 . The XRD test shows that the lattice parameters and cell volume increase as the Ni content increased, as presented in Table 1 [ 69 , 76 ]. As the Ni content increases, the hydrogen atom occupancy of the 8e site decreases from ~3.8% for ZrCoD 3 to ~2.5% for ZrCo 0.7 Ni 0.3 D 3 , and the Zr–D distance of ZrCoD 3 increases from 1.937 Å to 2.022 Å (ZrCo 0.7 Ni 0.3 D 3 ) [ 58 ].…”

Section: Effects Of Element Substitution On Anti-disproportionatiomentioning

confidence: 99%

“…Energy dispersive X-ray spectrometer (EDS) mapping micrographs (9) of the Zr 0.85 Nb 0.15 Co alloy; ( b ) ingot morphology and initial activation curves of Zr 1 – x Nb x Co samples (1) and hydriding kinetics curves of activated Zr 1 – x Nb x Co samples (2). X-ray diffraction (XRD) patterns of Zr 1 – x Nb x Co–H hydride samples after activation (3) and after dehydrogenation (4); ( c ) comparison of the cyclic hydrogen desorption capacity of Zr 1–x Nb x Co–H (x = 0–0.2) at 350 °C [ 69 ]; ( d ) XRD patterns of the samples loaded in the various beds after hydrogen delivery for the seventh cycle; ( e ) temperature-programmed hydrogen delivery curves of the ZrCo bed, Zr 0.8 Hf 0.2 Co bed, and Zr 0.8 Ti 0.2 Co bed from room temperature to 500 °C at a 2 °C/min heating rate; ( f ) comparison of hydrogen delivery amounts of the ZrCo bed, Zr 0.8 Ti 0.2 Co bed, and Zr 0.8 Hf 0.2 Co bed for seven cycles at 350 °C and 450 °C [ 18 ].…”

Section: Figurementioning

confidence: 99%

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Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Wang

et al. 2020

Materials

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Hydrogen-induced disproportionation (HID) during the cycles of absorption and desorption leads to a serious decline in the storage capacity of the ZrCo alloy, which has been recognized as the biggest obstacle to its application. Therefore, the prerequisite of a ZrCo application is to solve its anti-disproportionation problem in the field of rapid hydrogen isotope storage. Beyond surface modification and nanoball milling, this work systematically reviews the method of element substitution, which can obviously improve the anti-disproportionation. From a micro angle, as hydrogen atoms that occupy the 8e site in the ZrCoH3 lattice are instable and are considered to be the driving force of disproportionation, researchers believe that element substitution by changing the occupation of hydrogen atoms at the 8e site can improve the anti-disproportionation of the alloy. At present, Ti/Nb substitutions for the Zr terminal among substitute elements have an excellent anti-disproportionation performance. In this work, up-to-date research studies on anti-disproportionation and its disproportionation mechanism of the ZrCo alloy are introduced by combining experiments and simulations. Moreover, the optimization of the alloy based on the occupation mechanism of 8e sites is expected to improve the anti-disproportionation of the ZrCo alloy.

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Recent Progress in Functional Nanomaterials towards the Storage, Separation, and Removal of Tritium

et al. 2023

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Tritium is a sustainable next‐generation prime fuel for generating nuclear energy through fusion reactions to fulfill the increasing global energy demand. Owing to the scarcity–high demand tradeoff, tritium must be bred inside a fusion reactor to ensure sustainability and must therefore be separated from its isotopes (protium and deuterium) in pure form, stored safely, and supplied on demand. Existing multistage isotope separation technologies exhibit low separation efficiency and require intensive energy inputs and large capital investments. Furthermore, tritium‐contaminated heavy water constitutes a major fraction of nuclear waste, and accidents like the one at Fukushima Daiichi leave behind thousands of tons of diluted tritiated water, whose removal is beneficial from an environmental point of view. In this review, we discuss the recent progress and main research trends in hydrogen isotope storage and separation by focusing on the use of metal hydride (e.g., intermetallic, and high‐entropy alloys), porous (e.g., zeolites and metal organic frameworks (MOFs)), and 2‐D layered (e.g., graphene, hexagonal boron nitride (h‐BN), and MXenes) materials to separate and store tritium based on their diverse functionalities. Finally, the challenges and future directions for implementing tritium storage and separation are summarized in the reviewed materials.This article is protected by copyright. All rights reserved

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Improvement on the kinetic and thermodynamic characteristics of Zr1-xNbxCo (x = 0–0.2) alloys for hydrogen isotope storage and delivery

Cited by 53 publications

References 35 publications

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Recent Progress in Functional Nanomaterials towards the Storage, Separation, and Removal of Tritium

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Improvement on the kinetic and thermodynamic characteristics of Zr1-xNbxCo (x = 0–0.2) alloys for hydrogen isotope storage and delivery

Cited by 53 publications

References 35 publications

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr 50‐ x V x Co 50 ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr 50‐ x V x Co 50 ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Research Progress on the Anti-Disproportionation of the ZrCo Alloy by Element Substitution

Recent Progress in Functional Nanomaterials towards the Storage, Separation, and Removal of Tritium

Contact Info

Product

Resources

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Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys

Effects of V doping on microstructure, kinetic, and thermodynamic characteristics of Zr _{50‐
x} V _x Co ₅₀ ( x = 0, 2.5, 3.5, and 5.0) hydrogen storage alloys