Journal
INTERMETALLICS
Volume 127, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2020.106961
Keywords
Mg3GeNi2; Hydrogen storage electrode alloy; Electrochemical performance; Ni-MH battery; Mechanical milling; Electrocatalyst
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Funding
- National Natural Science Foundation of China [51771092, 21975125]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJB430014]
- Six Talent Peaks Project in Jiangsu Province [XNY-020]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
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Mg3GeNi2 hydrogen storage electrode alloy was synthesized successfully via mechanical milling followed by sintering, and its electrochemical performance as the negative electrode material in a nickel-metal hydride (Ni-MH) battery was studied for the first time. Then, different amounts of nano-nickel were added to the selected alloy with the pre-milling duration of 60 h to further improve the electrochemical performance. XRD results indicate that partial substitution of Mg by Ge in Mg2Ni can form a stable new phase of Mg3GeNi2 with excellent cycle stability. Nano-Ni addition can increase dramatically the discharge capacity and electrochemical kinetics of the alloy, which is attributed to the good electrocatalytic capability of the nano-Ni. The Mg3GeNi2-5 wt.% nano-Ni sample shows the optimum overall properties with the best electrochemical kinetics and the highest discharge capacity.
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