Phase transformation, thermodynamics and kinetics property of Mg90Ce5RE5 (RE = La, Ce, Nd) hydrogen storage alloys

Hui, Yongzheng; Guo, Shihai; Yuan, Zeming; Yan, Qingzhi; Zhao, Dongliang; Zhang, Yanghuan

doi:10.1016/j.jmst.2020.02.042

Cited by 73 publications

(10 citation statements)

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“…However, its thermal stability is high, and the kinetics is really slow, which severely restricts the practical applications. Many strategies were developed to tailor the performances of MgH 2 , such as nanoscaling, − alloying, − mixing with additives (metals, ,− oxides, ,, halides, and others − ), etc.…”

Section: Introductionmentioning

confidence: 99%

Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂

Liu

Wang

et al. 2021

ACS Appl. Mater. Interfaces

132

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Two-dimensional vanadium carbide (V 2 C) and titanium carbide (Ti 3 C 2 ) MXenes were first synthesized by exfoliating V 2 AlC or Ti 3 AlC 2 and then introduced jointly into magnesium hydride (MgH 2 ) to tailor the hydrogen desorption/absorption performances of MgH 2 . The as-prepared MgH 2 −V 2 C−Ti 3 C 2 composites show much better hydrogen storage performances than pure MgH 2 . MgH 2 with addition of 10 wt % of 2V 2 C/Ti 3 C 2 initiates hydrogen desorption at around 180 °C; 5.1 wt % of hydrogen was desorbed within 60 min at 225 °C, while 5.8 wt % was desorbed within 2 min at 300 °C. Under 6 MPa H 2 , the dehydrided MgH 2 −2V 2 C/Ti 3 C 2 can start to recover hydrogen at room temperature, and 5.1 wt % of H 2 is obtained within 20 s at a constant temperature of 40 °C. The reversible capacity (6.3 wt %) does not decline for up to 10 cycles, which shows excellent cycling stability. The addition of 2V 2 C/Ti 3 C 2 can remarkably lower the activation energy for the hydrogen desorption reaction of MgH 2 by 37% and slightly reduce the hydrogen desorption reaction enthalpy by 2 kJ mol −1 H 2 . It was demonstrated that the combination of V 2 C and Ti 3 C 2 promotes the hydrogen-releasing process of MgH 2 compared with addition of only V 2 C or Ti 3 C 2 , while Ti 3 C 2 impacts MgH 2 more significantly than V 2 C in the hydrogen absorption process of MgH 2 at ambient temperatures. A possible mechanism in the hydrogen release and uptake of the MgH 2 −V 2 C−Ti 3 C 2 system was proposed as follows: hydrogen atoms or molecules may preferentially transfer through the MgH 2 /V 2 C/Ti 3 C 2 triple-grain boundaries during the desorption process and through the Mg/ Ti 3 C 2 interfaces during the absorption process. Microstructure studies indicated that V 2 C and Ti 3 C 2 mainly act as efficient catalysts for MgH 2 . This work provides an insight into the hydrogen storage behaviors and mechanisms of MgH 2 boosted by a combination of two MXenes.

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Section: Introductionmentioning

confidence: 99%

Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂

Liu

Wang

et al. 2021

ACS Appl. Mater. Interfaces

132

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“…In order to improve the adsorption and desorption performance of MgH 2 hydrogen storage materials, researchers have modified MgH 2 by alloying [8][9][10][11][12], nanoscaling [13][14][15][16][17][18][19][20], surface modification [21], and catalyst doping [22][23][24][25][26][27][28], among others. The addition of a catalyst can significantly reduce the energy barrier of hydrogen absorption and desorption reactions, thus decreasing the reaction temperature and improving the kinetic performance.…”

Section: Introductionmentioning

confidence: 99%

The Improvement in Hydrogen Storage Performance of MgH2 Enabled by Multilayer Ti3C2

Fang

Liu

et al. 2021

Micromachines

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MgH2 has become a hot spot in the research of hydrogen storage materials, due to its high theoretical hydrogen storage capacity. However, the poor kinetics and thermodynamic properties of hydrogen absorption and desorption seriously hinder the development of this material. Ti-based materials can lead to good effects in terms of reducing the temperature of MgH2 in hydrogen absorption and desorption. MXene is a novel two-dimensional transition metal carbide or carbonitride similar in structure to graphene. Ti3C2 is one of the earliest and most widely used MXenes. Single-layer Ti3C2 can only exist in solution; in comparison, multilayer Ti3C2 (ML-Ti3C2) also exists as a solid powder. Thus, ML-Ti3C2 can be easily composited with MgH2. The MgH2+ML-Ti3C2 composite hydrogen storage system was successfully synthesized by ball milling. The experimental results show that the initial desorption temperature of MgH2-6 wt.% ML-Ti3C2 is reduced to 142 °C with a capacity of 6.56 wt.%. The Ea of hydrogen desorption in the MgH2-6 wt.% ML-Ti3C2 hydrogen storage system is approximately 99 kJ/mol, which is 35.3% lower than that of pristine MgH2. The enhancement of kinetics in hydrogen absorption and desorption by ML-Ti3C2 can be attributed to two synergistic effects: one is that Ti facilitates the easier dissociation or recombination of hydrogen molecules, while the other is that electron transfer generated by multivalent Ti promotes the easier conversion of hydrogen. These findings help to guide the hydrogen storage properties of metal hydrides doped with MXene.

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“…In recent years, two major approaches have been implemented to enhance the performances of Mg-based alloys: (1) adding catalytic elements, such as RE (rare-earth) elements 12 and TMs (transition metals); 13 and (2) creating amorphous and nanocrystalline microstructures, 14,15 including via hydriding combustion synthesis (HCS), 16 rapid solidification (RS), 17 and ball-milling (BM) methods. 18 Generally, Ni is the most effective of the transition-metal group of catalytic elements on hydrogen storage performance, especially electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Improving the dynamics of a Nd–Mg–Ni-based alloy by combining Ni element and mechanical milling

Zhang

Hui

et al. 2021

RSC Adv.

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Phase transformation, thermodynamics and kinetics property of Mg90Ce5RE5 (RE = La, Ce, Nd) hydrogen storage alloys

Cited by 73 publications

References 50 publications

Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂

Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂

The Improvement in Hydrogen Storage Performance of MgH2 Enabled by Multilayer Ti3C2

Improving the dynamics of a Nd–Mg–Ni-based alloy by combining Ni element and mechanical milling

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Phase transformation, thermodynamics and kinetics property of Mg90Ce5RE5 (RE = La, Ce, Nd) hydrogen storage alloys

Cited by 73 publications

References 50 publications

Combinations of V2C and Ti3C2 MXenes for Boosting the Hydrogen Storage Performances of MgH2

Combinations of V2C and Ti3C2 MXenes for Boosting the Hydrogen Storage Performances of MgH2

The Improvement in Hydrogen Storage Performance of MgH2 Enabled by Multilayer Ti3C2

Improving the dynamics of a Nd–Mg–Ni-based alloy by combining Ni element and mechanical milling

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Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂

Combinations of V₂C and Ti₃C₂ MXenes for Boosting the Hydrogen Storage Performances of MgH₂