镁
X射线光电子能谱
材料科学
扫描电子显微镜
氧化物
球磨机
氢
化学工程
氯化物
腐蚀
冶金
化学
复合材料
有机化学
工程类
作者
Xiaoxuan Wang,Xiaoyan Guo,Lixiang Zhu,Shuo Wang,Meishuai Zou,Xiaodong Li,Xiaodong Zhang,Tinglu Song
出处
期刊:Metals
[MDPI AG]
日期:2021-09-10
卷期号:11 (9): 1435-1435
被引量:1
摘要
Magnesium has bright market prospects such as generating thrust for under water engines and hydrogen production. However, the passive oxide film on the surface of magnesium powder prevents the further reaction of magnesium with water at room temperature. In this paper, highly active magnesium-based materials were prepared via ball milling pure Mg with different chlorides (NiCl2, CoCl2, CuCl2, FeCl3). The activity of the as obtained powder was analyzed through Scanning Electron Microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), synchrotron X-ray tomography, Extended X-ray Absorption Fine Structure (EXAFS), etc. Among the various compositions, the Mg-6%CoCl2 composite exhibited the best hydrogen production performance with a hydrogen generation volume of 423 mL/(0.5 g) and a conversion yield of 96.6%. The related activation mechanism was thoroughly studied, showing that the addition of chloride during ball milling can effectively break the continuity of oxide films on Mg surfaces and introduces a large number of micro defects. In addition, the EXAFS and tomography data verified that metallic cobalt was generated during the ball milling process, subsequently forming a Mg-Co micro glance cell, and the Cl− in the system accelerates the corrosion of Mg. The active mechanism can be verified as synergistic effects of micro glance cell and as-generated surface microcracks.
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