桂林电子科技大学学报Issue(3)：254-258,5.
Co部分替代Ni对La0.4Er0.4Mg0.2Ni3.3-xCoxAl0.2（0.1≤x≤0.4）储氢合金结构和电化学性能的影响
Effect of Co substitution for Ni on the structure and electrochemical properties of La0.4Er0.4Mg0.2Ni3.3-xCoxAl0.2(0.1≤x≤0.4)hydrogen storage alloys
摘要
Abstract
The method of Co to partial substitution Ni is used to improve the structure and electrochemical properties of the hydrogen storage La0.4 Er0.4 Mg0.2 Ni3.3-xCoxAl0.2 (0.1≤x≤0.4),La0.4 Er0.4 Mg0.2 Ni3.3-xCoxAl0.2 (0.1≤x≤0.4)alloys are prepared by induc-tion melting.The structure and electrochemical properties of La0.4 Er0.4 Mg0.2 Ni3.3-xCoxAl0.2 (0.1≤x≤0.4)hydrogen storage al-loys have been investigated by X-ray diffraction (XRD)technique and electrochemical measurement methods.XRD results reveal that all the alloys mainly consist of LaNi5 phase and La2 Ni7 phase.The electrochemical experiments demonstrate that the substitution of Co for Ni can increase the maximum discharge capacity and discharge capacity retention after 50 charge-discharge cycle and decrease the high rate dischargeability of the alloy electrodes.With x increasing from 0.1 to 0.4,the discharge capacity increases from 225 mA·h/g to 254.9 mA·h/g and the discharge capacity retention increases from 57.11% to 66.10% after 50 charge-discharge cycle.The results obtained from the electrochemical impedance spectroscopy (EIS)show the charge-transfer ability on the alloys surface decreases firstly and then increases with the Co addition.关键词
储氢合金/电化学性能/高倍率性能/电化学阻抗图谱Key words
hydrogen alloy/electrochemical property/high rate dischargeability/electrochemical impedance spectroscopy分类
通用工业技术引用本文复制引用
李斯,邓健秋,唐莹,刘鹏..Co部分替代Ni对La0.4Er0.4Mg0.2Ni3.3-xCoxAl0.2（0.1≤x≤0.4）储氢合金结构和电化学性能的影响[J].桂林电子科技大学学报,2014,(3):254-258,5.基金项目
国家自然科学基金(51261003) （51261003）
广西自然科学基金(2012GXNSFGA060002,2011GXNSFD018004) （2012GXNSFGA060002,2011GXNSFD018004）
广西教育厅科研项目(201201ZD009) （201201ZD009）
广西信息科学实验中心项目(20130113) （20130113）
