Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH<sub>2</sub>

Song, Mengchen; Zhang, Liuting; Yao, Zhendong; Zheng, Jiaguang; Shang, Danhong; Chen, Lixin; Li, Hong

doi:10.1039/d2qi00863g

Cited by 33 publications

(6 citation statements)

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“…As shown in Figure a, even after 50 cycles of hydrogen absorption at 150 °C and desorption at 275 °C, the MgH 2 –5 wt % Ni@C composite exhibited excellent reversibility, and the total capacity decay for hydrogen absorption and desorption was only 2.9 and 5.6% after 50 cycles, respectively. Compared with other MgH 2 –catalyst composites, ,,, the MgH 2 –5 wt % Ni@C composite in this work exhibits superior cycling stability. We observed the microstructure and phase composition of the MgH 2 –5 wt % Ni@C composite before and after hydrogen absorption/desorption cycling.…”

Section: Resultsmentioning

confidence: 99%

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite

Qian

et al. 2022

ACS Appl. Mater. Interfaces

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Doping a catalyst can efficiently improve the hydrogen reaction kinetics of MgH2. However, the hydrogen desorption behaviors are complicated in different MgH2–catalyst systems. Here, a carbon-encapsulated nickel (Ni@C) core–shell catalyst is synthesized to improve the hydrogen storage properties of MgH2. The complicated hydrogen desorption mechanism of the MgH2–Ni@C composite is elucidated. The experimental and theoretical calculation results indicate a short-range nanoreaction effect on the hydrogen desorption behaviors of the MgH2–Ni@C composite. The Ni@C catalysts and the adjacent MgH2 form nanoreaction sites along with preferential hydrogen desorption. The new interface between the in situ formed Mg and residual MgH2 contributes to the subsequent hydrogen desorption. With the nanoreaction sites increased via adding more catalyst, the short-range nanoreaction effect is more prominent; as a comparison, the interface effect becomes weaker or even disappears. In addition, the core–shell structure catalyst shows ultrahigh structural stability and catalytic activity, even after 50 hydrogen absorption and desorption cycles. Hence, this study provides new insights into the complicated hydrogen desorption behaviors and comes up with the short-range nanoreaction effect in the MgH2–catalyst system.

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Section: Resultsmentioning

confidence: 99%

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite

Qian

et al. 2022

ACS Appl. Mater. Interfaces

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“…Later, Zhang et al [ 82 ] found that iron nanosheets (Fe NS) led to better dehydrogenation/rehydrogenation kinetics of Mg/MgH 2 compared to iron particles. Recently, Song et al [ 93 ] introduced Fe nanocatalysts into MgH 2 and found that the operating temperature and activation energy of MgH 2 was significantly reduced. However, the growth of grains in Mg/MgH 2 -Fe composites during the dehydrogenation/rehydrogenation cycle resulted in capacity loss and kinetic degradation.…”

Section: Improvement Of Hydrogen Storage Performance Of Mg/mgh ...mentioning

confidence: 99%

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Yang

Zhang

et al. 2023

Materials

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Due to its high hydrogen storage efficiency and safety, Mg/MgH2 stands out from many solid hydrogen storage materials and is considered as one of the most promising solid hydrogen storage materials. However, thermodynamic/kinetic deficiencies of the performance of Mg/MgH2 limit its practical applications for which a series of improvements have been carried out by scholars. This paper summarizes, analyzes and organizes the current research status of the hydrogen storage performance of Mg/MgH2 and its improvement measures, discusses in detail the hot studies on improving the hydrogen storage performance of Mg/MgH2 (improvement measures, such as alloying treatment, nano-treatment and catalyst doping), and focuses on the discussion and in-depth analysis of the catalytic effects and mechanisms of various metal-based catalysts on the kinetic and cyclic performance of Mg/MgH2. Finally, the challenges and opportunities faced by Mg/MgH2 are discussed, and strategies to improve its hydrogen storage performance are proposed to provide ideas and help for the next research in Mg/MgH2 and the whole field of hydrogen storage.

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“…Besides the 2D grain boundaries, the large density of 1D lattice defects, such as dislocations, created by HEBM can further promote hydrogen sorption due to the enhanced diffusion length of hydrogen [34,35]. The catalytic effect of various additives, such as transition metals [36][37][38][39][40], metal oxides [32,[41][42][43][44][45], and carbonbased materials [46][47][48] incorporates an easier H 2 molecule dissociation at the surface of the nanoparticles, resulting in the reduction in hydride formation enthalpy. The hydriding reaction of Mg-based materials with hydrogen includes several stages, such as (I) Physisorption of the H 2 molecules by weak van der Waals interaction onto the free surface of magnesium powder particles; (II) Dissociation of hydrogen molecules into two H atoms; (III) Chemisorption of hydrogen atoms; (IV) Diffusion into bulk lattice sites, preferably along grain boundaries and dislocations and as a final step; (V) The nucleation and growth of the MgH 2 takes place [23,49].…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Multi-Particle Model Describing the Hydrogen Absorption of Nanocrystalline Magnesium Powders: A Case Study

Révész,

Pintér

2024

Energies

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Classical kinetic models describing the hydrogen absorption of nanocrystalline metallic hydrides generally do not involve any parameter related to the change in the crystallite size during the hydrogenation at constant temperature. In the present investigation, ball-milled nanocrystalline Mg powders exhibiting lognormal crystallite size distribution have been subjected to hydrogen absorption in a Sievert-type apparatus. Partially absorbed states were achieved by interrupting the hydrogenation cycle at different hydrogen content, i.e., when 15%, 50%, and 90% of Mg powder transformed to MgH2. The evolution of the characteristic size of the nucleating MgH2 phase was determined from X-ray diffraction analysis. Considering the crystallite size distribution of the as-milled powder agglomerate as well as the growth during the isothermal hydrogenation process, a time-dependent multi-particle reaction function ∝CV¯t;R(t) was developed. It was shown unambiguously for this case study that the measured hydrogen absorption curve of the ball-milled Mg powder shows the best correlation with this model when it is compared to classical kinetic functions or the previously developed multi-particle reaction function excluding the change in the average crystallite size during hydrogenation.

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Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH₂

Abstract: Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH2. To address this challenge, understanding the mechanism of kinetics declining during cycling is crucial but...

Cited by 33 publications

References 60 publications

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Time-Dependent Multi-Particle Model Describing the Hydrogen Absorption of Nanocrystalline Magnesium Powders: A Case Study

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Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH2

Abstract: Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH2. To address this challenge, understanding the mechanism of kinetics declining during cycling is crucial but...

Cited by 33 publications

References 60 publications

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH2–Ni@C Composite

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH2–Ni@C Composite

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends

Time-Dependent Multi-Particle Model Describing the Hydrogen Absorption of Nanocrystalline Magnesium Powders: A Case Study

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Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH₂

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite

Short-Range Nanoreaction Effect on the Hydrogen Desorption Behaviors of the MgH₂–Ni@C Composite