Electrochemical characteristics of amorphous MgTi_xNi(x = 0,0.1,and 0.2) hydrogen storage alloys
来源期刊：Rare Metals2010年第5期
论文作者：LIU Suqin,ZHAO Wenjuan,HUANG Kelong,and HUANG Hongxia College of Chemistry and Chemical Engineering,Central South University,Changsha ,China
文章页码：486 - 490
摘 要：MgTixNi（x = 0,0.1,and 0.2） alloys were successfully prepared by mechanical alloying（MA）,and the influence of milling time on the electrochemical characteristics of the electrodes was discussed.MgTixNi alloys after 90 h milling displayed the best electrochemical performance.The X-ray diffraction patterns showed that the alloy ball-milled for 90 h was amorphous with a widened diffraction peak.The charge-discharge tests indicated that these alloys had good electrochemical activation properties,and the MgTi0.2Ni alloy electrode exhibited the best cycle performance.The initial discharge capacity of the MgTi0.2Ni alloy reached up to 401.1 mAh·g-1,and the retention rate of capacity was 31.0% after 30 cycles,much higher than that of MgNi（17.3%）.The Tafel polarization curves revealed that Ti addition could enhance the anticorrosion performance of these alloys in alkali solution,which was responsible for the ameliorated cyclic stability of these alloy electrodes.
LIU Suqin,ZHAO Wenjuan,HUANG Kelong,and HUANG Hongxia College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China
摘 要：MgTixNi（x = 0,0.1,and 0.2） alloys were successfully prepared by mechanical alloying（MA）,and the influence of milling time on the electrochemical characteristics of the electrodes was discussed.MgTixNi alloys after 90 h milling displayed the best electrochemical performance.The X-ray diffraction patterns showed that the alloy ball-milled for 90 h was amorphous with a widened diffraction peak.The charge-discharge tests indicated that these alloys had good electrochemical activation properties,and the MgTi0.2Ni alloy electrode exhibited the best cycle performance.The initial discharge capacity of the MgTi0.2Ni alloy reached up to 401.1 mAh·g-1,and the retention rate of capacity was 31.0% after 30 cycles,much higher than that of MgNi（17.3%）.The Tafel polarization curves revealed that Ti addition could enhance the anticorrosion performance of these alloys in alkali solution,which was responsible for the ameliorated cyclic stability of these alloy electrodes.
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