A comparative study of NbF5 catalytic effects on hydrogenation/dehydrogenation kinetics of Mg-Zn-Ni and Mg-Cu-Ni systems

Yin, Yi; Qi, Yuan-hong; Li, Bo; Gu, Hu; Zhao, Jinghui; Ji, Liqiang; Zhang, Bo; Yuan, Zeming; Zhang, Yanghuan

doi:10.1016/j.matchar.2021.110993

Cited by 12 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moving towards the last step of hydrogen absorption, i.e., nucleation and growth of MgH 2 phase, it is still not clear if this is a rate-controlling step or not. Many studies have strongly recommended Johnson-Mehl-Avrami-Kolmogorov (JMAK), which is a suitable nucleation and growth model for many catalyzed MgH 2 systems [59,60]. Other diffusion models include "Jander diffusion model" which has been used to fit the kinetics of catalyzed MgH 2 systems [41,61,62].…”

Section: Mechanism Of Hydrogen Absorption/desorption and Need Of Catalystmentioning

confidence: 99%

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

et al. 2021

View full text Add to dashboard Cite

The goal of finding efficient and safe hydrogen storage material motivated researchers to develop several materials to fulfil the demand of the U.S. Department of Energy (DOE). In the past few years, several metal hydrides, complex hydrides such as borohydrides and alanates, have been researched and found efficient due to their high gravimetric and volumetric density. However, the development of these materials is still limited by their high thermodynamic stability and sluggish kinetics. One of the methods to improve the kinetics is to use catalysts. Among the known catalysts for this purpose, transition metals and their compounds are known as the leading contender. The present article reviews the d-block transition metals including Ni, Co, V, Ti, Fe and Nb as catalysts to boost up the kinetics of several hydride systems. Various binary and ternary metal oxides, halides and their combinations, porous structured hybrid designs and metal-based Mxenes have been discussed as catalysts to enhance the de/rehydrogenation kinetics and cycling performance of hydrogen storage systems.

show abstract

Section: Mechanism Of Hydrogen Absorption/desorption and Need Of Catalystmentioning

confidence: 99%

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The development of efficient and safe hydrogen storage technology is required to commercialize the hydrogen economy. So far, several states of storing hydrogen have been explored, namely, gaseous state, − liquid state, − and solid state. − Each of these kinds of storage has its own benefits. However, storing hydrogen in the solid state has more benefits, particularly regarding its safety and high volumetric hydrogen capacity.…”

Section: Introductionmentioning

confidence: 99%

Study of the Hydrogen Storage Properties and Catalytic Mechanism of a MgH₂–Na₃AlH₆ System Incorporating FeCl₃

et al. 2021

View full text Add to dashboard Cite

In this work, the catalytic effects of FeCl3 toward the hydrogen storage properties of the MgH2–Na3AlH6 composite were investigated for the first time. The temperature-programed desorption results indicated that the onset temperature of the hydrogen release of a 10 wt % FeCl3-doped MgH2–Na3AlH6 composite was ∼30 °C lower than that of the undoped MgH2–Na3AlH6 composite. The addition of FeCl3 into the MgH2–Na3AlH6 composite resulted in improved absorption and desorption kinetics performance. The absorption/desorption kinetics measurements at 320 °C (under 33 and 1 atm hydrogen pressure, respectively) indicated that within 10 min, the doped sample absorbed ∼4.0 wt % and desorbed ∼1.5 wt % hydrogen. By comparison, the undoped sample absorbed only ∼2.1 wt % and desorbed only ∼0.6 wt % hydrogen under the same conditions and time. Comparably, the apparent activation energy value of the doped composite is 128 kJ/mol, which is 12 kJ/mol lower than that of the undoped composite (140 kJ/mol). The formation of the new species of MgCl2 and Fe in the doped composite was detected from X-ray diffraction analysis after heating and absorption processes. These two components were believed to play a vital role in reducing the decomposition temperature and kinetics enhancement of the MgH2–Na3AlH6 composite.

show abstract

“…[10][11][12] For that, people usually take changing the alloy chemical composition by alloying processing to improve the alloys absorption-desorption property, as well as the alloys microstructure and thermodynamic characteristics. 13,14 A number of recent studies indicate that addition of transition metals or rare Earth elements to Mg 2 Ni-type alloys can be change microstructure [15][16][17][18][19][20] or form Mg-Ni phases, [21][22][23][24][25][26][27][28] thereby decreasing the decomposition temperature of the Mg 2 Ni hydride and improving its absorption/ desorption kinetics. Calculation shows that the elements doping can cause their lattice distortions so that their interactions between the atoms in the hydride could be reduced.…”

mentioning

confidence: 99%

Electrochemical Hydrogen Storage Kinetics and Microstructure of the Rapidly Quenched Alloy Mg₂Ni_0.75Zn_0.25

Hai

Liu

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

Mg2Ni0.75Zn0.25 alloys are prepared from Mg2Ni as master alloy and pure Zinc ingot by remelting process. The microstructures, electrochemical properties, and desorption kinetics of the as-cast and melt-spun alloys are investigated. The phase compositions and microstructures of the alloys are investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electron backscattering diffraction. The results show that the segregation atoms rich in Zn can inhibit the growth of Mg2Ni grains, especially the nanocrystalline grains formed in Mg2Ni0.75Zn0.25 alloy after melt-spinning. The rapidly quenched Mg2Ni0.75Zn0.25 alloy exhibits the largest discharge performance (102.1 mAh/g) and dehydrogenation activation energy (14.68 kJ/mol). The improvement of the kinetic properties is related to the hydrogen diffusion rate (D) in the alloys and the charge transfer reaction on the surface. The rapidly quenched Mg2Ni0.75Zn0.25 alloy has the largest D, 6.187×10-11 cm2/s. The doping of Zn aggravates the corrosion of alloy electrodes, which destroys the oxide layer on the alloy surface, provides a channel for the diffusion of hydrogen atoms.

show abstract

A comparative study of NbF5 catalytic effects on hydrogenation/dehydrogenation kinetics of Mg-Zn-Ni and Mg-Cu-Ni systems

Cited by 12 publications

References 45 publications

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

Study of the Hydrogen Storage Properties and Catalytic Mechanism of a MgH₂–Na₃AlH₆ System Incorporating FeCl₃

Electrochemical Hydrogen Storage Kinetics and Microstructure of the Rapidly Quenched Alloy Mg₂Ni_0.75Zn_0.25

Contact Info

Product

Resources

About

A comparative study of NbF5 catalytic effects on hydrogenation/dehydrogenation kinetics of Mg-Zn-Ni and Mg-Cu-Ni systems

Cited by 12 publications

References 45 publications

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review

Study of the Hydrogen Storage Properties and Catalytic Mechanism of a MgH2–Na3AlH6 System Incorporating FeCl3

Electrochemical Hydrogen Storage Kinetics and Microstructure of the Rapidly Quenched Alloy Mg2Ni0.75Zn0.25

Contact Info

Product

Resources

About

Study of the Hydrogen Storage Properties and Catalytic Mechanism of a MgH₂–Na₃AlH₆ System Incorporating FeCl₃

Electrochemical Hydrogen Storage Kinetics and Microstructure of the Rapidly Quenched Alloy Mg₂Ni_0.75Zn_0.25