碱土金属元素改性AB_3型贮氢合金
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摘要
本研究以AB_3型贮氢合金作为研究对象,研究了Al_(12)Mg_(17)-AB_5、Al_(12)Mg_(17)-AB_3及烧结法制备的La_(0.7)Mg_(0.3)Ni_(2.5)Co_(0.4)Mn_(0.2)Al_(0.1)合金的相结构及电化学性能,讨论了AB_3型合金成分、相结构与电化学性能的关系。研究结果表明,通过制备工艺和合金成分的优化,AB_3型贮氢合金的电化学贮氢性能明显提高。La_(0.7)Mg_(0.3)Ni_(2.5)Co_(0.4)Mn_(0.2)Al_(0.1)合金主要由(La,Mg)Ni_3和LaNi_5相构成,综合电化学性能最好。烧结时间对La_(0.7)Mg_(0.3)Ni_(2.5)Co_(0.4)Mn_(0.2)Al_(0.1)合金贮氢性能有明显影响,在1173K烧结4h的合金具有最大放电容量,其值达334mAh/g,在1173K烧结10h的样品循环稳定性最好,经100次循环后,容量保持率为69.1%。
AB_3-type hydrogen storage alloy containing alkaline-earth metals was studied.The Al_(12)Mg_(17)-AB_5,Al_(12)Mg_(17)-AB_3 and La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1) alloys were prepared by sintering method,and phase structure and electrochemical properties of the above AB_3-type hydrogen storage alloys were investigated.The results shown that the phases of the sintered La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1)alloy at different time were mainly consisted of the(La,Mg)Ni_3 and the LaNi_5,the electrochemical hydrogen storage properties were discriminating at different sintering time.The La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1) alloy exhibited best the electrochemical hydrogen storage properties,and the maximum discharge capacity is 334mAh/g sintered for 4 h,and the cycling capacity retention rate is 69.1%after 100 cycles sintered for 10 h at 1173 K.
AB_3-type hydrogen storage alloy containing alkaline-earth metals was studied.The Al_(12)Mg_(17)-AB_5,Al_(12)Mg_(17)-AB_3 and La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1) alloys were prepared by sintering method,and phase structure and electrochemical properties of the above AB_3-type hydrogen storage alloys were investigated.The results shown that the phases of the sintered La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1)alloy at different time were mainly consisted of the(La,Mg)Ni_3 and the LaNi_5,the electrochemical hydrogen storage properties were discriminating at different sintering time.The La_(0.7)Mg_(0.3)N_(i2.5)Co_(0.4)Mn_(0.2)Al_(0.1) alloy exhibited best the electrochemical hydrogen storage properties,and the maximum discharge capacity is 334mAh/g sintered for 4 h,and the cycling capacity retention rate is 69.1%after 100 cycles sintered for 10 h at 1173 K.
引文
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