测定了 LaNi_(5- x)Al_x(x=0,0.1,0.2,0.3)系合金在吸放氢过程中的贮氢性能。结果表明,贮氢容量随合金中 Al 含量的增加而降低,平台压力和热力学焓变和熵变随合金中 Al 含量的增加而降低,合金形成氢化物的稳定性增强;LaNi5- Alx 系合金...测定了 LaNi_(5- x)Al_x(x=0,0.1,0.2,0.3)系合金在吸放氢过程中的贮氢性能。结果表明,贮氢容量随合金中 Al 含量的增加而降低,平台压力和热力学焓变和熵变随合金中 Al 含量的增加而降低,合金形成氢化物的稳定性增强;LaNi5- Alx 系合金在吸放氢过程中的平台压力存在一定的差异,即滞后现象,滞后系数随合金中 Al 含量的增加而降低, x这 LaNi_(5- x)Al_x系的晶胞体积随合金中 Al 含量的增加而增加的必然结果; LaNi_(5- x)Al_x系合金的吸放氢动力学参数也与合金中的 Al 含量有关,活化能随 Al 含量的增加而降低,但活化能不存在数量级的差异。展开更多
This paper presents a new method of surface modification on LaNi5 hydr ogen storage alloy. The hydrogen alloy was treated in the acid CuSO4 solution co ntaining HF. The effect of HF on surface state of alloy was studi...This paper presents a new method of surface modification on LaNi5 hydr ogen storage alloy. The hydrogen alloy was treated in the acid CuSO4 solution co ntaining HF. The effect of HF on surface state of alloy was studied and the elec trochemical properties of modified alloy were investigated. Electrochemical impe dance spectra (EIS) was also applied to analyze the resistance property of alloy electrode after modification. SEM and XRD results showed that HF had corrosive effect on hydrogen alloy, which help copper grain to precipitate on alloy surfac e. EIS analysis showed that modified alloy had lower contact resistance and elec trochemical polarization, which resulted in a higher conductivity and electroche mical activation. Electrochemical testing showed modified alloy had better activ ation behavior and excellent large current discharge ability. Thus it could well satisfy the requirement of the application as power sources on electric vehicle s.展开更多
文摘测定了 LaNi_(5- x)Al_x(x=0,0.1,0.2,0.3)系合金在吸放氢过程中的贮氢性能。结果表明,贮氢容量随合金中 Al 含量的增加而降低,平台压力和热力学焓变和熵变随合金中 Al 含量的增加而降低,合金形成氢化物的稳定性增强;LaNi5- Alx 系合金在吸放氢过程中的平台压力存在一定的差异,即滞后现象,滞后系数随合金中 Al 含量的增加而降低, x这 LaNi_(5- x)Al_x系的晶胞体积随合金中 Al 含量的增加而增加的必然结果; LaNi_(5- x)Al_x系合金的吸放氢动力学参数也与合金中的 Al 含量有关,活化能随 Al 含量的增加而降低,但活化能不存在数量级的差异。
文摘This paper presents a new method of surface modification on LaNi5 hydr ogen storage alloy. The hydrogen alloy was treated in the acid CuSO4 solution co ntaining HF. The effect of HF on surface state of alloy was studied and the elec trochemical properties of modified alloy were investigated. Electrochemical impe dance spectra (EIS) was also applied to analyze the resistance property of alloy electrode after modification. SEM and XRD results showed that HF had corrosive effect on hydrogen alloy, which help copper grain to precipitate on alloy surfac e. EIS analysis showed that modified alloy had lower contact resistance and elec trochemical polarization, which resulted in a higher conductivity and electroche mical activation. Electrochemical testing showed modified alloy had better activ ation behavior and excellent large current discharge ability. Thus it could well satisfy the requirement of the application as power sources on electric vehicle s.
