Preparation and hydrogen sorption properties of a Ni decorated Mg based Mg@Ni nano-composite

Zou, Jianxin; Long, Sheng Ru; Chen, Xi; Zeng, Xiaoqin; Ding, Wei

doi:10.1016/j.ijhydene.2014.11.113

Cited by 66 publications

(22 citation statements)

References 35 publications

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“…Carbon structures are one of the most studied systems as Following the above reports, several efforts have been devoted to improve the sorption properties of MgH 2 using different nano-transition metals in different amount, prepared by different routes etc. [49,50], however, nano-Ni has always shown superior performance among them [51][52][53][54]. Recently Chen et al [53] prepared a composite of porous Ni nano-fibers via electrospinning technique and prepared a composite of these with MgH 2 using ball milling.…”

Section: Carbon and Other Elements As Additivementioning

confidence: 99%

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

2018

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Hydrogen storage materials have been a subject of intensive research during the last 4 decades. Several developments have been achieved in regard of finding suitable materials as per the US-DOE targets. While the lightweight metal hydrides and complex hydrides meet the targeted hydrogen capacity, these possess difficulties of hard thermodynamics and sluggish kinetics of hydrogen sorption. A number of methods have been explored to tune the thermodynamic and kinetic properties of these materials. The thermodynamic constraints could be resolved using an intermediate step of alloying or by making reactive composites with other hydrogen storage materials, whereas the sluggish kinetics could be improved using several approaches such as downsizing and the use of catalysts. The catalyst addition reduces the activation barrier and enhances the sorption rate of hydrogen absorption/desorption. In this review, the catalytic modifications of lightweight hydrogen storage materials are reported and the mechanism towards the improvement is discussed.

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Section: Carbon and Other Elements As Additivementioning

confidence: 99%

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

2018

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“…Ni was added to Mg by Revesz et al [4], Zou et al [5], and Orimo et al [6] to improve the hydrogen sorption kinetics of Mg, to lower the hydrogen release temperature of MgH 2 , or to increase the hydrogen storage capacity of Mg.…”

Section: Introductionmentioning

confidence: 99%

“…Summarizing, Ni [4][5][6], Ti [7,8], and Ni and Ti [9] were added to Mg to improve hydrogen sorption properties. In Table 1 lists the compositions and names of the samples.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zn(BH4)2, Ni, and/or Ti Doping on the Hydrogen-Storage Features of MgH2

Song¹,

Kwak²

2019

Korean J. Met. Mater.

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In the present work, MgH 2 was doped with Zn(BH 4) 2 , Ni, and/or Ti to improve its hydrogen absorption and release features. Samples were prepared by grinding in a planetary ball mill in a hydrogen atmosphere. To increase the hydrogen absorption and release rates without significantly sacrificing hydrogenstorage capacity the additive percentages were less than 10 wt%. The activation of these samples was not necessary. M2.5Z2.5N had the largest quantity of hydrogen absorbed in 60 min, Q a (60 min), at the number of cycles, NC, of one (NC=1), followed in descending order by M5Z2.5N2.5T and M1Z. M5Z2.5N2.5T had the highest initial release rate, followed in descending order by M2.5Z2.5N and M1Z. M5Z2.5N2.5T had the highest initial release rate and M1Z had the largest quantity of hydrogen released in 60 min, Q d (60 min) at NC=2. The sample without Ni (M1Z) had the lowest initial release rate at NC=2. Among these samples, M2.5Z2.5N had the best hydrogen absorption and release properties. Grinding MgH 2 with Zn(BH 4) 2 , Ni, and/ or Ti in hydrogen is believed to create defects, induce lattice strain, generate cracks, and reduce the particle sizes. The formed hydrides β-MgH 2 , γ-MgH 2 , and TiH 1.924 are believed to help produce finer particles in the sample by being pulverized during grinding in hydrogen. The formed Zn and TiH 1.924 and the NaCl remained unreacted during cycling. It was deemed that the formed Mg 2 Ni phase contributed to the increases in the initial hydrogen absorption and release rates and the improvement in cycling performance by absorbing and releasing hydrogen itself.

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“…The preparation of the Zn(BH 4 ) 2 was accompanied by the formation of sodium chloride (NaCl). Nakamori et al [2,3] In order to improve the hydrogen sorption properties of Mg, Ni [4][5][6], Ti [7,8], and Ti and/or Ni [9] were added. Orimo et al [6]…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Hydrogen Release Properties of Zn(BH4)2-Added MgH2 Alloy and Zn(BH4)2 and Ni-Added MgH2 Alloy

Song¹,

Kwak²

2018

Korean J. Met. Mater.

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Samples with compositions of 99 w/o MgH 2 +1 w/o Zn(BH 4) 2 (designated MgH 2-1Zn(BH 4) 2) and 96 w/o MgH 2 +2 w/o Zn(BH 4) 2 +2 w/o Ni (designated MgH 2-2Zn(BH 4) 2-2Ni) were prepared by milling in a planetary ball mill in a hydrogen atmosphere (reaction-involving milling). The hydrogen release properties of MgH 2-1Zn(BH 4) 2 and MgH 2-2Zn(BH 4) 2-2Ni were compared. A larger quantity of additives and the addition of Ni decreased the temperature at which MgH 2 decomposes in the as-milled samples. Activation processes were not required for these two samples. A larger quantity of additives and the addition of Ni by milling in a hydrogen atmosphere increased the quantity of hydrogen absorbed in 60 min (U (60 min)), the initial hydrogen release rate, and the quantity of hydrogen released in 60 min (R (60 min)). MgH 2-2Zn(BH 4) 2-2Ni had an effective hydrogen storage capacity of about 5.5 w/o at the cycle number, CN, of one (CN=1). A ZnH 2 phase, which has not been reported to be formed, was found in the MgH 2-1Zn(BH 4) 2 sample and the Zn(BH 4) 2 and Ni-added MgH 2 sample after hydrogen uptake-release cycling. Mg 2 Ni was formed in the Zn(BH 4) 2 and Niadded MgH 2 sample after hydrogen uptake-release cycling. The rapid hydrogen release rate of the Mg 2 NiH 4 formed in MgH 2-2Zn(BH 4) 2-2Ni is believed to increase the initial hydrogen release rate of MgH 2-2Zn(BH 4) 2-2Ni. The Mg 2 Ni decomposed from Mg 2 NiH 4 might facilitate the nucleation of a Mg-H solid solution in the MgH 2-2Zn(BH 4) 2-2Ni sample. There is also a slight possibility that the contraction due to the relatively rapid hydrogen release of the Mg 2 NiH 4 provides passages for the hydrogen released from neighboring MgH 2 .

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Preparation and hydrogen sorption properties of a Ni decorated Mg based Mg@Ni nano-composite

Cited by 66 publications

References 35 publications

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

Catalytic Tuning of Sorption Kinetics of Lightweight Hydrides: A Review of the Materials and Mechanism

Effects of Zn(BH<sub>4</sub>)<sub>2</sub>, Ni, and/or Ti Doping on the Hydrogen-Storage Features of MgH<sub>2</sub>

Comparison of the Hydrogen Release Properties of Zn(BH4)2-Added MgH2 Alloy and Zn(BH4)2 and Ni-Added MgH2 Alloy

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