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Structure and Electrochemical Properties of A_2B_7-Type La-Mg-Ni Hydrogen Storage Alloys 被引量:2

Structure and Electrochemical Properties of A_2B_7-Type La-Mg-Ni Hydrogen Storage Alloys
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摘要 Investigation of alloy structure shows that La2-xMgxNi7 (x = 0.3 - 0.8) alloys are mainly com- posed of Ce/Ni7-type, Gd2Co7-type and PuNi3-type phase. The influence of Mg content in alloys on the phase structure is great, resulting in a linear decrease of the unit cell parameters of main phases and increase of hydrogen absorption/desorption plateau as Mg content increases. Electrochemical measurements show that as the Mg content increases, the discharge capacity of alloy electrodes first increases and then decreases. The cyclic stability presents a deteriorative trend. La1.4Mg0.6 Ni7 alloy electrode exhibits the maximum electrochemical discharge capacity (378 mAh·g^-1), and the La1.6Mg0.4Ni7 alloy electrode shows the best cyclic stability (S270 = 81%). Investigation of alloy structure shows that La2-xMgxNi7 (x = 0.3 - 0.8) alloys are mainly com- posed of Ce/Ni7-type, Gd2Co7-type and PuNi3-type phase. The influence of Mg content in alloys on the phase structure is great, resulting in a linear decrease of the unit cell parameters of main phases and increase of hydrogen absorption/desorption plateau as Mg content increases. Electrochemical measurements show that as the Mg content increases, the discharge capacity of alloy electrodes first increases and then decreases. The cyclic stability presents a deteriorative trend. La1.4Mg0.6 Ni7 alloy electrode exhibits the maximum electrochemical discharge capacity (378 mAh·g^-1), and the La1.6Mg0.4Ni7 alloy electrode shows the best cyclic stability (S270 = 81%).
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第5期625-625,共1页 稀土学报(英文版)
关键词 hydrogen storage alloy A2B7-type P-C-T isotherm electrochemical properties rare earths hydrogen storage alloy A2B7-type P-C-T isotherm electrochemical properties rare earths
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