Effect of Mg3MnNi2 on the electrochemical and hydrogenation properties of Mg2Ni alloy

• Main Authors: Chun-Yu Lin, 林峻右
• Other Authors: Chih-Kuang Lin
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/92353164022956185726

碩士 === 國立中央大學 === 材料科學與工程研究所 === 96 === Mg3MnNi2-Mg2Ni alloy systems with different ratio is produced by an innovative method, isothermal evaporation casting process (IECP) in this work. The effects of Mg3MnNi2(β phase) on the electrochemical and hydrogenation properties of Mg2Ni(γ phase) alloy were investigated. Inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and X-ray diffraction (XRD) analyses demonstrate that mass production for Mg3MnNi2-Mg2Ni alloy systems with different ratio was successfully fabricated by IECP. It is observed that HCP-Mg2Ni (γ phase) and FCC-Mg3MnNi2 (β phase) have nearly oxidation/reduction potential and their absorption/ desorption pressure plateaus are similar. It is also found by X-ray photoelectron spectroscopy (XPS) that addition Mg3MnNi2 in Mg2Ni alloy reduced the passive Mg(OH)2 layer formation and led to discharge capacity, discharge efficiency and discharge cycle life improving. It is found that it is difficult to corroded in alkaline electrolyte and hydrogenation for Mg3MnNi2 in comparison with Mg2Ni. It is caused Mg3MnNi2 addition in Mg2Ni resulted in an improvement for electrochemical properties and a deceleration for hydriding-dehydriding rate.