Controllable fabrication of Ni-based catalysts and their enhancement on desorption properties of MgH2

Zhang, Ji‐Guang; Li, Shenyang; Zhu, Yunfeng; Lin, Huaijun; Liu, Yana; Zhang, Yao; Ma, Zhongliang; Li, Liquan

doi:10.1016/j.jallcom.2017.05.011

Cited by 44 publications

(12 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, GS can separate the Ni catalyzed particles from each other and prevent the aggregation of MgH 2 adjacent at high temperature and pressure. [107] Catalyst prepared by C supported metal Ni also has good performance. Using benzimidazole as reducing agent and carbon precursor, Li et al [108] prepared nano Ni@C by selftemplate method.…”

Section: Ni-based Carbon-supported Catalystmentioning

confidence: 97%

“…The doped nano-sized Ni catalyst (5 at%) significantly reduces the desorption temperature of MgH 2 , and the hydrogen absorption kinetics of the composite system is even 16 times higher than that of pure MgH 2 . [15] Zhang et al [16] prepared Ni-based catalysts with different morphologies by different methods. They concluded that the particle size and distribution of catalysts in MgH 2 matrix were closely related to the desorption performance and independent of the initial shape of Ni.…”

Section: Transition Metal Element 21 Transition Metal Nickelmentioning

confidence: 99%

“…The initial hydrogen pressures used in the hydrogen absorption and desorption process are 3.0 and 0.005 MPa, respectively. [107] Reproduced with permission from Ref. [107].…”

Section: Ni-based Carbon-supported Catalystmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

et al. 2021

View full text Add to dashboard Cite

Magnesium hydride (MgH 2 ) has become a very promising hydrogen storage material because of its high hydrogen storage capacity, good reversibility and low cost. However, high thermodynamic stability and slow kinetic performance of MgH 2 limit its practical application. In the past few decades, many alternative methods have been designed to solve this problem. A large number of studies have demonstrated that the use of metal catalyst doping modification, MgH 2 nanocrystallization and other methods can greatly improve the hydrogen absorption and dehydrogenation performance of MgH 2 . Therefore, this paper reviews and summarizes the modification effect of transition metal catalyst doping on the hydrogen storage performance of MgH 2 , especially the catalysis on the de/rehydrogenation performance of MgH 2 . In addition, promoting effects of carbon materials, transition metal alloys and compounds on the hydrogen storage performance of MgH 2 were also summarized. Finally, the existing problems and challenges of MgH 2 as hydrogen storage materials are discussed, and some possible strategies are proposed.

show abstract

Section: Ni-based Carbon-supported Catalystmentioning

confidence: 97%

Section: Transition Metal Element 21 Transition Metal Nickelmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Graphene is an ideal scaffold material due to its low-density, high chemical stability and large surface area. There are plenty of studies reporting the enhanced kinetics by adding metal-graphene composites, such as Ni@rGO [104,113,114], NiCo@rGO [115], Ni 2 P@rGO [36], TiN@rGO [101], and CeF 4 @Gr [116]. Adding graphene not only enhances the dispersion of metal compounds, but also prevents the aggregation of MgH 2 , thereby further enhancing cycle properties.…”

Section: Adding Dopantsmentioning

confidence: 99%

Lightweight hydrides nanocomposites for hydrogen storage: Challenges, progress and prospects

Huang

et al. 2019

Sci. China Mater.

View full text Add to dashboard Cite

As typical high-capacity complex hydrides, lightweight hydrides have attracted intensive attention due to their high gravimetric and volumetric energy densities of hydrogen storage. However, lightweight hydrides also have high thermodynamic stability and poor kinetics, so they ususally require high hydrogen desorption temperature and show inferior reversibility under mild conditions. This review summarizes recent progresses on the endeavor of overcoming thermodynamic and kinetic challenges for Mg based hydrides, lightweight metal borohydrides and alanates. First, the current state, advantages and challenges for Mg-based hydrides and lightweight metal hydrides are introduced. Then, alloying, nanoscaling and appropriate doping techniques are demonstrated to decrease the hydrogen desorption temperature and promote the reversibility behavior in lightweight hydrides. Selected scaffolds materials, approaches for synthesis of nanoconfined systems and hydriding-dehydriding properties are reviewed. In addition, the evolution of various dopants and their effects on the hydrogen storage properties of lightweight hydrides are investigated, and the relevant catalytic mechanisms are summarized. Finally, the remaining challenges and the sustainable research efforts are discussed.

show abstract

“…The composite of MgH 2 + 5 wt.% Ni/TiO2 is reported to desorb 5.24 wt.% H 2 in 30 min at 250 °C temperature [27]. Recently, Zhang et al systematically studied the influence of Ni morphology (including shape and size) on the hydrogen storage performances of MgH 2 , and provided a guideline for designing nanostructured catalysts with high activity [28]. Moreover, the novel carbon structure is more favorable for further improving its catalytic activity of Ni/C compounds [29,30,31,32].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Hydrogen Desorption Characteristics of MgH2 With Core-shell Ni@C Composites

Deng

2018

Molecules

View full text Add to dashboard Cite

Magnesium hydride (MgH2) has become popular to study in hydrogen storage materials research due to its high theoretical capacity and low cost. However, the high hydrogen desorption temperature and enthalpy as well as the depressed kinetics, have severely blocked its actual utilizations. Hence, our work introduced Ni@C materials with a core-shell structure to synthesize MgH2-x wt.% Ni@C composites for improving the hydrogen desorption characteristics. The influences of the Ni@C addition on the hydrogen desorption performances and micro-structure of MgH2 have been well investigated. The addition of Ni@C can effectively improve the dehydrogenation kinetics. It is interesting found that: i) the hydrogen desorption kinetics of MgH2 were enhanced with the increased Ni@C additive amount; and ii) the dehydrogenation amount decreased with a rather larger Ni@C additive amount. The additive amount of 4 wt.% Ni@C has been chosen in this study for a balance of kinetics and amount. The MgH2-4 wt.% Ni@C composites release 5.9 wt.% of hydrogen in 5 min and 6.6 wt.% of hydrogen in 20 min. It reflects that the enhanced hydrogen desorption is much faster than the pure MgH2 materials (0.3 wt.% hydrogen in 20 min). More significantly, the activation energy (EA) of the MgH2-4 wt.% Ni@C composites is 112 kJ mol−1, implying excellent dehydrogenation kinetics.

show abstract

Controllable fabrication of Ni-based catalysts and their enhancement on desorption properties of MgH2

Cited by 44 publications

References 44 publications

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

Improvement of Mg‐Based Hydrogen Storage Materials by Metal Catalysts: Review and Summary

Lightweight hydrides nanocomposites for hydrogen storage: Challenges, progress and prospects

Improvement of Hydrogen Desorption Characteristics of MgH2 With Core-shell Ni@C Composites

Contact Info

Product

Resources

About