Kinetic properties of La2Mg17–x wt.% Ni (x = 0–200) hydrogen storage alloys prepared by ball milling

Li, Xia; Yang, Tai; Zhang, Yanghuan; Zhao, Dongliang; Ren, Huiping

doi:10.1016/j.ijhydene.2014.04.123

Cited by 25 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, just like the experimental alloys shown in Fig. 8, slope potential plateaus exist in all discharge potential curves of Mg-based alloys as a common feature, which has been reported by many kinds of references [44][45][46]. Increasing Ce content and milling duration will conspicuously increase the discharge potential and prolong the discharge plateau, thus improving the discharge potential characteristics of electrodes.…”

Section: Electrochemical Performancessupporting

confidence: 68%

Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg–Ce–Ni–Al-Based Alloys

Zhang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

Self Cite

View full text Add to dashboard Cite

At room temperature, crystalline Mg-based alloys, including Mg 2 Ni, MgNi, REMg 12 and La 2 Mg 17 , have been proved with weak electrochemical hydrogen storage performances. For improving their electrochemical property, the Mg is partially substituted by Ce in Mg-Ni-based alloys and the surface modification treatment is performed by mechanical coating Ni. Mechanical milling is utilized to synthesize the amorphous and nanocrystalline Mg 1−x Ce x Ni 0.9 Al 0.1 (x = 0, 0.02, 0.04, 0.06, 0.08) + 50 wt%Ni hydrogen storage alloys. The effects made by Ce substitution and mechanical milling on the electrochemical hydrogen storage property and structure have been analyzed. It shows that the as-milled alloys electrochemically absorb and desorb hydrogen well at room temperature. The as-milled alloys, without any activation, can reach their maximal discharge capacities during first cycling. The maximal value of the 30-h-milled alloy depending on Ce content is 578.4 mAh/g, while that of the x = 0.08 alloy always grows when prolonging milling duration. The maximal discharge capacity augments from 337.4 to 521.2 mAh/g when milling duration grows from 5 to 30 h. The cycle stability grows with increasing Ce content and milling duration. Concretely, the S 100 value augments from 55 to 82% for the alloy milled for 30 h with Ce content rising from 0 to 0.08 and from 66 to 82% when milling the x = 0.08 alloy mechanically from 5 to 30 h. The alloys' electrochemical dynamics parameters were measured as well which have maximum values depending on Ce content and keep growing up with milling duration extending.

show abstract

Section: Electrochemical Performancessupporting

confidence: 68%

Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg–Ce–Ni–Al-Based Alloys

Zhang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Its crystal structure was drawn with Diamond 3.0 software in Figure 1. It can be seen that the La 7.0 Mg 75.5 Ni 17.5 alloy had a multiphase structure containing an LaMg 2 Ni phase with a CuMgAl 2 -type structure [16][17][18] relatively low hydrogen desorption temperature and fine kinetic properties [14]. However, the hydrogen storage capacity of this alloy was dramatically reduced by excessive un-hydrogenation elements such as La and Ni.…”

Section: Resultsmentioning

confidence: 98%

“…This material with the optimized composition of LaMg 2 Ni exhibited a relatively low hydrogen desorption temperature and fine kinetic properties [14]. However, the hydrogen storage capacity of this alloy was dramatically reduced by excessive un-hydrogenation elements such as La and Ni.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation and Hydrogen Storage Properties of an La7.0Mg75.5Ni17.5 Hydrogen Storage Alloy

Nan

et al. 2017

Crystals

View full text Add to dashboard Cite

X-ray diffraction showed that an La 7.0 Mg 75.5 Ni 17.5 alloy prepared via inductive melting was composed of an La 2 Mg 17 phase, an LaMg 2 Ni phase, and an Mg 2 Ni phase. After the first hydrogen absorption/desorption process, the phases of the alloy turned into an La-H phase, an Mg phase, and an Mg 2 Ni phase. The enthalpy and entropy derived from the van't Hoff equation for hydriding were −42.30 kJ·mol −1 and −69.76 J·K −1 ·mol −1 , respectively. The hydride formed in the absorption step was less stable than MgH 2 (−74.50 kJ·mol −1 and −132.3 J·K −1 ·mol −1 ) and Mg 2 NiH 4 (−64.50 kJ·mol −1 and −123.1 J·K −1 ·mol −1 ). Differential thermal analysis showed that the initial hydrogen desorption temperature of its hydride was 531 K. Compared to Mg and Mg 2 Ni, La 7.0 Mg 75.5 Ni 17.5 is a promising hydrogen storage material that demonstrates fast adsorption/desorption kinetics as a result of the formation of an La-H compound and the synergetic effect of multiphase.

show abstract

“…Moreover, adding Ni in Mg-rich rare earth-Mg system alloy can significantly improve its electrochemical hydrogen storage properties [13][14][15]. In the present work, the LaMg 11-Ni + x wt% Ni (x = 100, 200) alloys were prepared by mechanical milling, and the effects of milling time and Ni content on the structures and electrochemical performances of the alloys have been investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage performances of LaMg11Ni +xwt% Ni (x= 100, 200) alloys prepared by mechanical milling

Zhang

Wang

Zhai

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Kinetic properties of La2Mg17–x wt.% Ni (x = 0–200) hydrogen storage alloys prepared by ball milling

Cited by 25 publications

References 34 publications

Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg–Ce–Ni–Al-Based Alloys

Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg–Ce–Ni–Al-Based Alloys

Phase Transformation and Hydrogen Storage Properties of an La7.0Mg75.5Ni17.5 Hydrogen Storage Alloy

Hydrogen storage performances of LaMg11Ni +xwt% Ni (x= 100, 200) alloys prepared by mechanical milling

Contact Info

Product

Resources

About