The Effects of Sn Element on Hydrogen Storage Characteristics of Mg2-xSnxNi(x=0, 0.05, 0.1, 0.15, 0.2) Alloys

2006 ◽  
Vol 971 ◽  
Author(s):  
Jin Guo ◽  
Cunke Huang ◽  
Kun Yang ◽  
Guangxu Li ◽  
Weiqing Jiang
Keyword(s):  
Hydrogen Storage ◽  
Discharge Capacity ◽  
Hydrogen Absorption ◽  
Main Phase ◽  
Partial Substitution ◽  
Electrochemical Characteristics ◽  
Hydrogen Storage Alloys ◽  
Ni Alloy ◽  
Suitable Amount ◽  
Storage Characteristics

ABSTRACTMg2-xSnxNi (x=0, 0.05, 0.1, 0.15, 0.2) hydrogen storage alloys were prepared and the effects of substitution of Sn for Mg on hydrogen storage performances of the alloys were investigated. In the alloys, Mg2Ni is main phase and the amorphous degree increases gradually with amount of Sn content increasing. Partial substitution of Sn for Mg can change the temperature of hydrogen absorption reaction effectively. The Mg1.85Sn0.15Ni alloy absorbs hydrogen at about 330K which is about 80K lower than that of Mg2Ni alloy. Discharge capacity increases quickly with amount of substitution Sn for Mg increasing. Suitable amount of substitution of Sn for Mg and amorphous can improve the thermodynamic and electrochemical characteristics of hydrogen absorption reaction for Mg2Ni-based alloy.

High-Temperature Characteristics of Melt-Spun Hydrogen Storage Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2505-2508
Author(s):  
Rong Li ◽  
Jianmin Wu ◽  
Yan Qi ◽  
Shaoxiong Zhou
Keyword(s):  
High Temperature ◽  
Hydrogen Storage ◽  
Hydrogen Evolution ◽  
Discharge Capacity ◽  
Hydrogen Storage Alloys ◽  
Temperature Characteristics ◽  
Hydride Formation ◽  
Melt Spun ◽  
Electrochemical Capacity ◽  
Melt Spun Ribbons

In this work, the electrochemical discharge capacity of melt-spun (MmY)1 (NiCoMnAl)5 ribbons, in which the content of yttrium was 0-2.5wt%, was studied in the temperature range of 30~80oC. It was found that adding element yttrium made the electrochemical capacity of the compounds increased. The capacity obtained was 333mAh/g at 30 oC and 247 mAh/g at 80oC when the content of yttrium was 2.0wt%. In addition, 70~85% recovery of the capacity was obtained due to better antioxidation. The increase of charging/discharging efficiency with yttrium substitution for Mm in melt-spun ribbons illustrated by the potential characteristics of charging/discharging is ascribed to the flatter and lower hydride formation potential, as well as the higher hydrogen evolution potential. Moreover, This effect is more prominent with increasing yttrium content.

Electrochemical Hydrogen Storage Characteristics of (Mg1-XZrX)2Ni (x = 0 - 0.3) Alloys Prepared by Mechanical Alloying

2011 ◽  
Vol 291-294 ◽  
pp. 29-33 ◽  
Author(s):  
Yang Huan Zhang ◽  
Zhong Hui Hou ◽  
Shi Hai Guo ◽  
Guo Fang Zhang ◽  
Xia Li ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Discharge Capacity ◽  
Electrochemical Measurement ◽  
Discharge Voltage ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Electrochemical Hydrogen Storage ◽  
Milling Duration ◽  
Storage Characteristics

The electrode alloys (Mg1-xZrx)2Ni (x = 0, 0.3) were prepared by mechanical alloying (MA). Mg in the alloy was partially substituted by Zr in order to improve the electrochemical hydrogen storage characteristics of the Mg2Ni-type alloy. The effects of substituting Mg with Zr as well as milling duration on the microstructures and electrochemical performances of the alloys were investigated in detail. The results showed that the substitution of Zr facilitates the formation of amorphous Mg2Ni-type phase. The electrochemical measurement indicated that the substitution of Zr significantly enhances the discharge capacity and cycle stability of the alloys, and it markedly improved the discharge potential characteristic of the alloys. For a fixed alloy, the electrochemical performances, including the cycle stability and the discharge voltage characteristic as well as discharge capacity, of the alloys were markedly improved with prolonging of the ball-milling duration.

Characteristics Before and After Heat Treatment of Co-Free AB3-Type Fe Substituted Hydrogen Storage Alloys Used for Ni-MH Batteries

2010 ◽  
Vol 129-131 ◽  
pp. 1049-1054 ◽  
Author(s):  
Feng Wu ◽  
Min Yu Zhang ◽  
Dao Bin Mu
Keyword(s):  
Heat Treatment ◽  
Hydrogen Storage ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
Hydrogen Storage Alloys ◽  
Positive Effects ◽  
Fe Content ◽  
Before And After ◽  
Short Time ◽  
Positive Effect

In this paper, a series of hydrogen storage Co-free AB3-type alloys were directly synthesized with vacuum mid-frequency melting method, and melted alloys were treated by low temperature-short time heat annealing. XRD results indicate that the main phase of melted La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys are LaMg2Ni9 and LaNi5 phase. After heat treatment, some LaMg2Ni9 phase transferred into LaNi3 phase because of the loss of Mg during the heat proceeding. The content of Fe element affects phase structure of alloys and led to different electrochemical properties. Heat treatment has positive effects on cycle stability of La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys but could cause little reduction of discharge capacity of Fe substituted alloy. However, the discharge capacity of La0.7Mg0.3Ni2.8Fe0.2 alloy increased after heat treatment. The EIS results show that heat treatment has positive effect on H transfer within alloy, and Fe content is related to the diffusion coefficient of H atoms within alloys.

Microstructures and Electrochemical Properties of La0.7Ce0.3Ni3.7Co0.7-xAl0.2Mn0.4(Fe0.43B0.57)x (x = 0-0.4) Hydrogen Storage Alloys

2012 ◽  
Vol 608-609 ◽  
pp. 917-920
Author(s):  
Yu Zhou ◽  
Yan Ping Fan ◽  
Xian Yun Peng ◽  
Bao Zhong Liu
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Secondary Phase ◽  
Cycling Stability ◽  
High Rate ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray ◽  
The Matrix

X-ray diffraction results indicate that pristine alloy has a single LaNi5 phase and the alloys containing Fe0.43B0.57 consist of the matrix LaNi5 phase and the La3Ni13B2 secondary phase. The abundance of La3Ni13B2 phase increases with increasing x value. Maximum discharge capacity of the alloy electrodes monotonically decreases from 336.1 mAh/g (x = 0) to 281.2 mAh/g (x = 0.4). High-rate dischargeability of the alloy electrodes first increases with increasing x from 0 to 0.20, and then decreases when x increases to 0.4. Cycling stability decreases with increasing x from 0 to 0.4.

scholarly journals Investigation on the Structure and Electrochemical Properties of La-Ce-Mg-Al-Ni Hydrogen Storage Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Yuqing Qiao ◽  
Jianyi Xi ◽  
Minshou Zhao ◽  
Guangjie Shao ◽  
Yongchun Luo ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Discharge Capacity ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Type Structure ◽  
Hydrogen Storage Alloy ◽  
Alloy Electrode ◽  
Electrochemical Characteristics ◽  
Transfer Resistance ◽  
Discharge Current Density

Structure and electrochemical characteristics of La0.96Ce0.04Mg0.15Al0.05Ni2.8hydrogen storage alloy have been investigated. X-ray diffraction analyses reveal that the La0.96Ce0.04Mg0.15Al0.05Ni2.8hydrogen storage alloy consisted of a (La, Mg)Ni3phase with the rhombohedral PuNi3-type structure and a LaNi5phase with the hexagonal CaCu5-type structure. TEM shows that the alloy is multicrystal with a lattice space 0.187 nm. EDS analyse shows that the content of Mg is 3.48% (atom) which coincide well with the designed composition of the electrode alloy. Electrochemical investigations show that the maximum discharge capacity of the alloy electrode is 325 mAh g−1. The alloy electrode has higher discharge capacity within the discharge current density span from 60 mA g−1to 300 mA g−1. Electrochemical impedance spectroscopy measurements indicate that the charge transfer resistanceRTon the alloy electrode surface and the calculated exchange current densityI0are 0.135 Ω and 1298 mA g−1, respectively; the better eletrochemical reaction kinetic of the alloy electrode may be responsible for the better high-rate dischargeability.

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