in-situ formed Pt nano-clusters serving as destabilization-catalysis bi-functional additive for MgH2

Yuan, Zirui; Li, Shaohan; Wang, Kaiwen; Xu, Nuo; Sun, Weiwei; Sun, Litao; Cao, Hujun; Lin, Huaijun; Zhu, Yunfeng; Zhang, Yao

doi:10.1016/j.cej.2022.135050

Cited by 45 publications

(18 citation statements)

References 42 publications

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“…It indicated that the hydrogen desorption behaviors of MgH 2 –Ni@C depended on the catalyst content. Previous studies focused on the balance between the hydrogen desorption properties (temperature and capacity) and catalyst addition amount. ,,, Then, the hydrogen storage properties of the better MgH 2 –catalyst composite were discussed, but the complicated hydrogen desorption behaviors caused by the catalyst addition amount need to be paid much more attention. To understand the catalysis of Ni@C in the hydrogen desorption of the MgH 2 –catalyst composite, the DSC measurement of MgH 2 – Z wt % Ni@C was stopped at some key temperature points and the corresponding phase structure was tested by XRD and TEM (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…The reaction kinetics can be affected by the physical adsorption/desorption and dissociation/recombination of hydrogen molecules on the surface and the diffusion and migration of the hydrogen atom in the bulk of particle. , Except for the physicochemical property of Mg/MgH 2 itself, particle size and uniformity, temperature, pressure, catalyst, and other potential affecting factors for improving the hydrogen storage performance need to be considered. In general, the catalysts mostly act as reaction sites for hydrogen dissociation and recombination to shorten the reaction process in the MgH 2 –catalyst composite and weaken the apparent activation energy of hydrogen absorption and desorption. , Several hydrogen desorption mechanisms have been established to explain the sharp improvement of the MgH 2 –catalyst system, including spillover, hydrogen pump, , and electron transfer or interaction. ,, …”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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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“…It can be seen that Mg, Mn, V, and O are uniformly distributed in the sample, implying that the catalysts are well-distributed on the Mg/MgH 2 surface. The in situ formed catalysts are uniformly distributed and have a positive effect on dehydrogenation and hydrogenation. − Based on the above characterization and analysis, the reaction path of the MgH 2 + MnV 2 O 6 composite after ball milling can be expounded as follows After ball milling of MgH 2 –6MnVO, MnV 2 O 6 was decomposed into MnV alloy and V 2 O 3 , which participated in the catalytic process of MgH 2 dehydrogenation and hydrogenation. In the following, the entire catalytic reaction process and the route are described in detail in Figure .…”

Section: Resultsmentioning

confidence: 99%

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

et al. 2022

ACS Appl. Mater. Interfaces

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While magnesium hydride (MgH2) has drawn considerable attention as a promising hydrogen storage material, it suffers from sluggish kinetics and high desorption temperature, hindering potential applications. Herein, we show that the hydrogen desorption kinetics of MgH2 can be significantly improved using bimetallic oxide MnV2O6 as the catalyst. A MgH2–MnV2O6 composite was prepared by a high-energy ball milling method. The results showed that the MgH2–MnV2O6 composite can release 5.57 wt % hydrogen within 10 min under 250 °C. The dehydrogenated MgH2–MnV2O6 sample can absorb 3.09 wt % hydrogen within 10 min under 50 °C. Notably, the reversible hydrogen storage property did not degrade at least within 100 cycles, showing excellent cycle stability. X-ray diffraction and transmittance electron microscopy measurements revealed that MnV alloy and V2O3 phases were formed during the ball milling process, leading to the synergistic catalytic effect. We argue that the bimetallic MnV alloy plays key catalytic roles in this system because MnV alloy can promote the fracture of the H–H and Mg–H bonds, significantly improving the hydrogen storage kinetics and low-temperature reversible hydrogen storage performance of MgH2.

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“…29-37 29-37 Several research groups have also looked into various transition metal-based catalysts in order to increase the performance of Mg/MgH 2 . 18,23,24,[38][39][40][41][42][43][44][45] The use of TiVO 3.5 catalyst resulted in a significant improvement in MgH 2 storage kinetics. 46 TiF 4 is a good catalyst for enhancing the MgH 2 re/dehydrogenation kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have published their findings on Mg‐based alloys for hydrogen storage applications 29‐37 . Several research groups have also looked into various transition metal‐based catalysts in order to increase the performance of Mg/MgH 2 18,23,24,38‐45 . The use of TiVO 3.5 catalyst resulted in a significant improvement in MgH 2 storage kinetics 46 .…”

Section: Introductionmentioning

confidence: 99%

Catalytic characteristics of titanium‐( IV )‐isopropoxide ( TTIP ) on de/re‐hydrogenation of wet ball‐milled MgH ₂ / Mg

Pandey

Verma

Bhatnagar

et al. 2022

Intl J of Energy Research

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Magnesium hydride (MgH 2 ) has received much attention as a solid-state hydrogen storage material worldwide due to its high hydrogen storage capacity, good reversibility, and low cost. However, its practical application has been limited due to its high thermodynamic stability and slow kinetics. In the present work, we have employed a new type of catalyst, Titanium-tetraisopropoxide (TTIP) (Ti(OC 3 H 7 ) 4 ), to catalyze MgH 2 . To disperse the catalyst evenly over the MgH 2 , the milling operation was conducted using tetrahydrofuran (THF) as a process control agent. Here, using THF as the process control agent during the wet ball milling along with TTIP of MgH 2 itself used to improve the de/re-hydrogenation behavior of MgH 2 . A de/re-hydrogenation investigation demonstrates that MgH 2 catalyzed by TTIP has better hydrogen storage properties (onset dehydrogenation temperature 210 C) than as-cast MgH 2 (onset dehydrogenation temperature $400 C). Furthermore, a remarkable catalytic behavior of TTIP on MgH 2 was observed during de-/rehydrogenation kinetics (absorb the hydrogen $4.6 wt% within the 1.5 minutes at a temperature of 300 C under a hydrogen pressure of 20 atm and release the hydrogen of $4.98 wt% within 5 minutes at $300 C) due to formation of intermediate compound Mg 1Àx Ti x O, and it retains nearly constant hydrogen storage capacity (from 5.25 to 5.20 wt% in rehydrogenation and from 4.95 wt % to 4.95 wt% in dehydrogenation) up to 60 cycles of de/re-hydrogenation. The estimated desorption activation energy for MgH 2 -TTIP using Arrhenius equation is 77.67 kJ/mol. The reason for de/re-hydrogenation kinetics improvement of MgH 2 -TTIP can be seen in the mechanism.

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in-situ formed Pt nano-clusters serving as destabilization-catalysis bi-functional additive for MgH2

Cited by 45 publications

References 42 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

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Catalytic characteristics of titanium‐( IV )‐isopropoxide ( TTIP ) on de/re‐hydrogenation of wet ball‐milled MgH ₂ / Mg

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in-situ formed Pt nano-clusters serving as destabilization-catalysis bi-functional additive for MgH2

Cited by 45 publications

References 42 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

Synergistic Effect of a Facilely Synthesized MnV2O6 Catalyst on Improving the Low-Temperature Kinetic Properties of MgH2

Catalytic characteristics of titanium‐( IV )‐isopropoxide ( TTIP ) on de/re‐hydrogenation of wet ball‐milled MgH 2 / Mg

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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

Synergistic Effect of a Facilely Synthesized MnV₂O₆ Catalyst on Improving the Low-Temperature Kinetic Properties of MgH₂

Catalytic characteristics of titanium‐( IV )‐isopropoxide ( TTIP ) on de/re‐hydrogenation of wet ball‐milled MgH ₂ / Mg