Excellent catalytic activity of a two-dimensional Nb4C3Tx (MXene) on hydrogen storage of MgH2

Liu, Yana; Gao, Haiguang; Zhu, Yunfeng; Li, Shenyang; Zhang, Ji‐Guang; Li, Liquan

doi:10.1016/j.apsusc.2019.07.037

Cited by 101 publications

(35 citation statements)

References 56 publications

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“…It was found that the Mg−H bonds can be broken more easily due to the fact that the charge would transfer from the Ti atoms to the Nb atoms and that the adsorption energy of H 2 on NbTi is lower. Liu et al 55 used Nb 4 C 3 to tailor MgH 2 and reported an activation process of MgH 2 −Nb 4 C 3 for the initial three cycles. The activated MgH 2 −5 wt % Nb 4 C 3 starts releasing hydrogen at 150 °C and can desorb about 5.6 wt % of hydrogen in 7 min at a constant temperature of 250 °C.…”

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

145

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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

145

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“…The E a value was calculated to be 56 ± 4 kJ/mol H 2 (Figure 6c), which is close to the activation energy of the MgH 2 −Ni nanocomposite (57.4 kJ/mol H 2 ) synthesized by the Rieke method. 21 However, these values are slightly higher than those obtained for the MgH 2 −5 wt % Nb 4 C 3 T x (27.8 kJ/mol H 2 ) 17 and MgH 2 −10 wt % Ni/CMK-3 (37 kJ/mol H 2 ) composites. 26 3.2.2.…”

Section: Resultsmentioning

confidence: 70%

Using a Self-Assembled Two-Dimensional MXene-Based Catalyst (2D-Ni@Ti₃C₂) to Enhance Hydrogen Storage Properties of MgH₂

Zhu

Panda

et al. 2020

ACS Appl. Mater. Interfaces

137

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In this work, we report the remarkable catalytic effects of a novel Ti3C2 MXene-based catalyst (Ni@Ti-MX), which was prepared via self-assembling of Ni nanoparticles onto the surface of exfoliated Ti3C2 nanosheets. The resultant Ni@Ti-MX catalyst, characterized by ultradispersed Ni nanoparticles being anchored on the monolayer Ti3C2 flakes, was introduced into MgH2 through ball milling. In situ transmission electron microscopy (TEM) analysis revealed that a synergetic catalytic effect of multiphase components (Mg2Ni, TiO2, metallic Ti, etc.) derived in the MgH2 + Ni@Ti-MX composite exhibits remarkable improvements in the hydrogen sorption kinetics of MgH2. In particular, the MgH2 + Ni@Ti-MX composite can absorb 5.4 wt % H2 in 25 s at 125 °C and release 5.2 wt % H2 in 15 min at 250 °C. Interestingly, it can uptake 4 wt % H2 in 5 h even at room temperature. Furthermore, the dehydrogenation peak temperature of the MgH2 + Ni@Ti-MX composite is about 221 °C, which is 50 and 122 °C lower than that of MgH2 + Ti-MX and MgH2, respectively. The excellent hydrogen sorption properties of the MgH2 + Ni@Ti-MX composite are primarily attributed to the peculiar core–shell nanostructured MgH2@Mg2NiH4 hybrid materials and the interfacial coupling effects from different catalyst–matrix interfaces. The results obtained in this study demonstrate that using self-assembling of transition-metal elements on two-dimensional (2D) materials as a catalyst is a promising approach to enhance the hydrogen storage properties of MgH2.

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“…Ongoing recent trends in developing novel systems for energy storage have incorporated MXene materials with a 2D structure, as promising hydride hosts [94,156,[176][177][178][179][180][181][182][183][184][185][186][187][188][189][190][191][192][193][194]. While only few examples are currently available, it is foreseeable that MXenes will grow to become a mainstream storage matrix for nanoconfined hydride-based materials (Table 7).…”

Section: Mxenementioning

confidence: 99%

Recent Development in Nanoconfined Hydrides for Energy Storage

Comănescu

2022

IJMS

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Hydrogen is the ultimate vector for a carbon-free, sustainable green-energy. While being the most promising candidate to serve this purpose, hydrogen inherits a series of characteristics making it particularly difficult to handle, store, transport and use in a safe manner. The researchers’ attention has thus shifted to storing hydrogen in its more manageable forms: the light metal hydrides and related derivatives (ammonia-borane, tetrahydridoborates/borohydrides, tetrahydridoaluminates/alanates or reactive hydride composites). Even then, the thermodynamic and kinetic behavior faces either too high energy barriers or sluggish kinetics (or both), and an efficient tool to overcome these issues is through nanoconfinement. Nanoconfined energy storage materials are the current state-of-the-art approach regarding hydrogen storage field, and the current review aims to summarize the most recent progress in this intriguing field. The latest reviews concerning H2 production and storage are discussed, and the shift from bulk to nanomaterials is described in the context of physical and chemical aspects of nanoconfinement effects in the obtained nanocomposites. The types of hosts used for hydrogen materials are divided in classes of substances, the mean of hydride inclusion in said hosts and the classes of hydrogen storage materials are presented with their most recent trends and future prospects.

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Excellent catalytic activity of a two-dimensional Nb4C3Tx (MXene) on hydrogen storage of MgH2

Cited by 101 publications

References 56 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

Using a Self-Assembled Two-Dimensional MXene-Based Catalyst (2D-Ni@Ti₃C₂) to Enhance Hydrogen Storage Properties of MgH₂

Recent Development in Nanoconfined Hydrides for Energy Storage

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Excellent catalytic activity of a two-dimensional Nb4C3Tx (MXene) on hydrogen storage of MgH2

Cited by 101 publications

References 56 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

Using a Self-Assembled Two-Dimensional MXene-Based Catalyst (2D-Ni@Ti3C2) to Enhance Hydrogen Storage Properties of MgH2

Recent Development in Nanoconfined Hydrides for Energy Storage

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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

Using a Self-Assembled Two-Dimensional MXene-Based Catalyst (2D-Ni@Ti₃C₂) to Enhance Hydrogen Storage Properties of MgH₂