摘要
金属Ce替代LaNi_(4.5)Al_(0.5)合金中的La用以提高金属吸/放氢热力学性能。通过研究合金La1-xCexNi_(4.5)Al_(0.5)(x=0~0.4)的相结构、储氢热力学以及吸/放氢动力学发现,所制备的合金主相为六方晶系LaNi_(5)相;随着Ce替代量的增加(x=0~0.4),合金晶体结构中a轴呈现减小的趋势、c轴及各向异性(c/a)呈现出先增大后减小再增大的趋势;储氢性能测试表明,随着Ce替代量的增加,合金的吸/放氢平台压升高,最大储氢量减小;合金吸/放氢反应热优化程度与各向异性(c/a)呈现出相同趋势,当x=0.2时,合金吸放氢反应焓变分别降低至26.33 kJ/mol和24.30 kJ/mol。
Metal Ce is used to replace La in alloy LaNi_(4.5)Al_(0.5)to improve the metal hydrogen absorption/desorption thermodynamic properties.The following results were obtained by studying the phase structure,hydrogen storage thermodynamics and hydrogen absorption/desorption kinetics of alloy La_(1-x)Ce_xNi_(4.5)Al_(0.5)(x=0 to 0.4).The main phase of the prepared alloy is LaNi_(5)with hexagonal crystal system characteristics,and with the increase of Ce substitution(x=0 to 0.4),the a-axis of the alloy shows a decreasing trend,while the c-axis and the anisotropy(c/a)show a undulating trend.The maximum hydrogen storage capacity of the alloy decreases as the pressure of hydrogen absorption/desorption plateau increases.The optimization of hydrogen absorption and desorption reaction heat of the alloy shows the same trend as anisotropy(c/a).When x=0.2,the enthalpy change of hydrogen absorption and desorption reaction decreases to 26.33 kJ/mol and 24.30 kJ/mol.
作者
伏康康
赵鑫
可丹丹
齐燕亭
胡锋
蔡颖
闫和平
段亚楠
FU Kang-kang;ZHAO Xin;KE Dan-dan;QI Yan-ting;HU Feng;CAI Ying;YAN He-ping;DUAN Ya-nan(College of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Fangda Carbon New Material Co.,Lid.,Lanzhou 730080,China;Inner Mongolia Chaoke Gas Technology Co.,Ltd.,Baotou 014010,China)
出处
《稀土》
CAS
CSCD
北大核心
2023年第2期86-92,I0005,共8页
Chinese Rare Earths
基金
内蒙古自然科学基金项目(2019BS05020,2020LH05024)。
关键词
贮氢合金
P-C-T曲线
热力学
吸/放氢动力学
活化能
hydrogen storage alloy
P-C-T curve
thermodynamics
hydrogen absorption/desorption kinetics
activation energy
