Optimization of LaNi5 hydrogen storage properties by the combination of mechanical alloying and element substitution

LaNi5 is a commercial hydrogen storage alloy with great potential. But its performance still needs to be optimized to meet the standard proposed by the US Department of Energy. Element substitution is a very important method to optimize the performance of hydrogen storage alloys, especially suitable...

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Bibliographic Details
Published in:International journal of hydrogen energy 2024-01, Vol.53, p.394-402
Main Authors: Liu, Yuchen, Chabane, Djafar, Elkedim, Omar
Format: Article
Language:English
Subjects:
Acoustics
Automatic
Electric power
Electrochemical tests
Engineering Sciences
Fluid mechanics
Hydrogen storage alloys
LaNi5 optimization
Materials
Mechanical alloying
Mechanics
Micro and nanotechnologies
Microelectronics
Physics
Thermics
Total energy
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Summary:LaNi5 is a commercial hydrogen storage alloy with great potential. But its performance still needs to be optimized to meet the standard proposed by the US Department of Energy. Element substitution is a very important method to optimize the performance of hydrogen storage alloys, especially suitable for AB5 alloys. As a novel method to produce nanocrystalline hydrogen storage alloys, mechanical alloying is also often applied to optimize the properties of hydrogen storage alloys. In this work, first of all, the simulation method based on first principles is applied to predict the performance of 8 elements substituting Ni respectively, and select the most suitable element to substitute Ni. Then the phase composition characterization, hydrogen storage performance tests and electrochemical performance tests were carried out. It was found that mechanical alloying can greatly improve the hydrogen storage performance of LaNi5, and different ball milling times can bring about different performance changes. After adding Cr to the ball-milled LaNi5, the properties of the formed LaNi4Cr were further improved. •Calculation of total energy was applied to select substitution atoms.•Among 8 elements, Cr was the best one to substitute Ni.•Mechanical alloying was used to synthesis LaNi5.•The particle size and strain rate were calculated from XRD patterns.•The two methods greatly improve the properties of LaNi5.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.12.038