Influence of CoSi on the electrochemical hydrogen storage properties of MgNi alloy

Yanhui Zhang; Lifang Jiao; Huatang Yuan; Yunyun Zhang; Li Liu; Yijing Wang

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Influence of CoSi on the electrochemical hydrogen storage properties of MgNi alloy

Yanhui Zhang,Lifang Jiao,Huatang Yuan *,Yunyun Zhang,Li Liu,Yijing Wang

Institute of New Energy Material Chemistry, Nankai University

*Correspondence author

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Funding: 国家自然科学基金,教育部博士点基金,国家８６３计划,天津市自然科学基金（No.50571046, 50631020, 50701025, 20573058,20070055064,2006AA05Z110,07JCYBJC03500）

Opened online:21 January 2008

Accepted by: none

Citation: Yanhui Zhang,Lifang Jiao,Huatang Yuan.Influence of CoSi on the electrochemical hydrogen storage properties of MgNi alloy[OL]. [21 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18234

MgNi and MgNi-CoSi were synthesized by mechanical alloying. The structural and electrochemical properties of the materials were investigated systematically. The results of structural test show that MgNi-CoSi has a better amorphous structure than MgNi. Charge-discharge studies show that the maximum discharge capacities of the alloy electrodes decrease but the cycle stabilities are improved remarkably with the introduction of CoSi. MgNi-CoSi which MA 10 h, performs the best among the as-prepared materials, the discharge capacity retention ratio is 57.6% at cycle 30, and that of MgNi is only 22.2%. Electrochemical impedance spectroscopy and liner polarization studies indicate that the electrochemical kinetics of MgNi is improved by CoSi. Potentiodynamic polarization curves show that the rate of corrosion of the MgNi-CoSi decreases. In conclusion, CoSi adding is an effective way to improve the cycle life of MgNi.

Keywords:Ni/MH batteries; Magnesium-based alloys; MgNi-CoSi; Mechanical alloying; Electrochemical properties

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