Ce替代La对合金LaNi_(4.5)Al_(0.5)储氢性能及热力学的影响  

Effect of Ce Substitution for La on the Hydrogen Storage Properties and Thermodynamics of Alloy LaNi_(4.5)Al_(0.5)

作　　者：伏康康 赵鑫 可丹丹 齐燕亭 胡锋[1] 蔡颖[1] 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)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]方大炭素新材料科技股份有限公司,甘肃兰州730080 [3]内蒙古潮科气体科技有限公司,内蒙古包头014010

出　　处：《稀土》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)。

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.

关 键 词：贮氢合金 P-C-T曲线 热力学 吸/放氢动力学 活化能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]