期刊
MEMBRANES
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/membranes11010067
关键词
hydrogen permeation; vanadium; mobility; chemical potential; first principle calculation
类别
资金
- CREST project of the Japan Science and Technology Agency (JST) [JPMJCR1443]
- KAKENHI of the Japan Society for the Promotion of Science (JSPS) [JP19H02454]
Vanadium (V) alloy membranes have higher hydrogen permeability but poor resistance to hydrogen-induced embrittlement. Adding Cr and Fe can enhance the mobility of hydrogen atoms, while the additions of Al and Pd decrease hydrogen diffusivity. For V-based alloy membranes, Fe and Cr are more suitable alloy elements compared with Al and Pd in terms of hydrogen diffusivity.
Vanadium (V) has higher hydrogen permeability than Pd-based alloy membranes but exhibits poor resistance to hydrogen-induced embrittlement. The alloy elements are added to reduce hydrogen solubility and prevent hydrogen-induced embrittlement. To enhance hydrogen permeability, the alloy elements which improve hydrogen diffusivity in V are more suitable. In the present study, hydrogen diffusivity in V-Cr, V-Al, and V-Pd alloy membranes was investigated in view of the hydrogen chemical potential and compared with the previously reported results of V-Fe alloy membranes. The additions of Cr and Fe to V improved the mobility of hydrogen atoms. In contrast, those of Al and Pd decreased hydrogen diffusivity. The first principle calculations revealed that the hydrogen atoms cannot occupy the first-nearest neighbor T sites (T1 sites) of Al and Pd in the V crystal lattice. These blocking effects will be a dominant contributor to decreasing hydrogen diffusivity by the additions of Al and Pd. For V-based alloy membranes, Fe and Cr are more suitable alloy elements compared with Al and Pd in view of hydrogen diffusivity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据