球磨时间对La0.7Pr0.3MgNi3.6Co0.4合金的气态储氢性能影响研究
Research on the effect of ball milling time on the gaseous hydrogen storage properties of La0.7Pr0.3MgNi3.6Co0.4 alloy
张成磊 1翟亭亭 1高雪云 1王海燕1
作者信息
- 1. 内蒙古科技大学材料科学与工程学院,内蒙古包头 014010
- 折叠
摘要
通过机械球磨制备了球磨时间为0.50、1、1.50、2 h的La0.7 Pr0.3 MgNi3.6 Co0.4合金,系统研究了合金的结构及气态储氢性能.采用扫描电镜(SEM)和X射线衍射仪(XRD)对合金的微观组织形貌和相结构进行表征.使用PCT气态储氢测试仪对合金的气态储氢性能进行测试.随着球磨时间的延长,合金粉末的尺寸逐渐减小且非晶结构逐渐增多.球磨可以缩短合金的活化孕育期,并且使吸氢反应活化能由61.83 kJ/mol减小到38.08 kJ/mol.吸氢反应焓变ΔH由46.23 kJ/mol减小到32.33 kJ/mol,吸氢反应熵变ΔS由127.45 J/mol·K减小到88.44 J/mol·K.
Abstract
In this paper,four kinds of La0.7Pr0.3MgNi3.6Co0.4 alloys were prepared by mechanical ball milling with ball milling times of 0.50,1,1.50 and 2 h.The structure and the gaseous hydrogen storage properties of the alloy have been systematically studied.The microstructure and phase structure of the alloy were characterized by scanning electron microscopy(SEM)and X-ray diffractometer(XRD).The gaseous hydrogen storage performance of the alloy was tested by PCT gaseous hydrogen storage tester.With the extension of milling time,the size of alloy powder decreases and the amount of amorphous structure increases gradually.Ball milling can shorten the activation incubation period and reduce the activation energy of hydrogen absorption from 61.83 kJ/mol to 38.08 kJ/mol.The en-thalpy change Δhof hydrogen absorption reaction decreases from 46.23 kJ/mol to 32.33 kJ/mol,and the entropy change Δsof hydro-gen absorption reaction decreases from 127.45 J/mol·K to 88.44 J/mol·K.
关键词
球磨/LaMgNi4/储氢合金/气态储氢性能Key words
ball milling/LaMgNi4/hydrogen storage alloy/gaseous hydrogen storage properties引用本文复制引用
基金项目
内蒙古自治区自然科学基金面上项目(2021MS05064)
出版年
2024
NETL
NSTL
万方数据