Study on phase structure and electrochemical properties of Ml1−xMgxNi2.80Co0.50Mn0.10Al0.10 (x=0.08, 0.12, 0.20, 0.24, 0.28) hydrogen storage alloys

2007 ◽  
Vol 52 (19) ◽  
pp. 5945-5949 ◽  
Author(s):  
Yuan Li ◽  
Shumin Han ◽  
Jinhua Li ◽  
Lin Hu
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Phase Structure ◽  
Hydrogen Storage Alloys

The Phase Structure and Electrochemical Properties of La4MgNi17M2(M=Ni,Co,Mn) Hydrogen Storage Alloys

2014 ◽  
Vol 875-877 ◽  
pp. 282-287
Author(s):  
Fan Song Wei ◽  
Fan Na Wei ◽  
Huan Huan Lu ◽  
Hong Fu Xiang
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Phase Structure ◽  
Storage Capacity ◽  
Electrochemical Measurement ◽  
Xrd Analysis ◽  
High Rate ◽  
Cyclic Stability ◽  
Hydrogen Storage Alloys ◽  
Hydrogen Storage Capacity

The phase structure and electrochemical properties of La4MgNi17M2(M=Ni,Co,Mn) alloys were investigated in detail. The XRD analysis revealed that the main phases in the alloys are LaNi5 and La4MgNi19 phases (Ce5Co19+Pr5Co19 structure). When the Ni element in the alloy was substituted by Mn or Co, the abundant of La4MgNi19 phase increased, and especially in the La4MgNi17Mn2 alloy, that increased to 70.7%. The electrochemical measurement showed that the activation of La4MgNi17M2(M=Ni,Co,Mn) alloy electrodes were improved, and it only needed 1-2 cycles.what’s more, with the elements substitution for Ni ,the maximum discharge capacity gradually increased to 386.10 mA·h/g (Co) and 375.18 mA·h/g (Mn), but high-rate dischargeability (HRD) decreased somewhat (Co, HRD900=86.2%). It is found that the HRD was mainly controlled by the electrocatalytic activity on the alloy electrode surface, and the decline of cyclic stability was due to the appearance of A5B19 type phase with larger hydrogen storage capacity, which lead to bigger volume expansion or intercrystalline stress, then easier pulverization during charging/discharging. In addition, the cyclic stability (S100) was improved with Co substitution, and worsened with Mn substitution, because Mn element was easily corroded and Co improved the ability of Corrosion resistance.

Phase structure and electrochemical properties of La0.7Ce0.3Ni3.75Mn0.35Al0.15Cu0.75−x(Fe0.43B0.57)x hydrogen storage alloys

2012 ◽  
Vol 516 ◽  
pp. 53-57 ◽  
Author(s):  
Baozhong Liu ◽  
Mengjuan Hu ◽  
Liqiang Ji ◽  
Yanpin Fan ◽  
Yongguang Wang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Phase Structure ◽  
Hydrogen Storage Alloys
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