Achieving fast hydrogenation by hydrogen-induced phase separation in Mg-based amorphous alloys

Achieving fast hydrogenation by hydrogen-induced phase separation in Mg-based amorphous alloys

作者

Huang, LJ (Huang, L. J.) 1

Wang, H (Wang, H.) 1

Ouyang, LZ (Ouyang, L. Z.) 1

Sun, DL (Sun, D. L.) 2

Lin, HJ (Lin, H. J.) 3

Zhu, M (Zhu, M.) 1

JOURNAL OF ALLOYS AND COMPOUNDS

卷887

文献号161476

DOI10.1016/j.jallcom.2021.161476

出版时间DEC 20 2021

文献类型Article

摘要

Mg-based amorphous alloys are one of the potential hydrogen storage materials. The challenges which are blocking application of such alloys involve unfavorable crystallization of amorphous phase in hydrogenation and dehydrogenation and sluggish low-temperature de/hydrogenation kinetics. To solve those challenges, the Mg60RExNi30-xCu10 (RE=La and Ce; x = 5, 7.5, 10 and 15) amorphous alloys were prepared by melt spinning and the structural transformation of amorphous phase and its correlation to hydrogenation ki-netics has been investigated. It is observed that all the amorphous powders are able to absorb more than 3.0 wt%-H at 130 degrees C under 4.5 MPa-H-2, and the hydrogen absorption rate of the Mg60RE10Ni20Cu10 amorphous alloys is much faster than other alloys by forming a dual amorphous phase structure during hydrogenation. XRD characterization of Mg60Ce10Ni20Cu10 hydrides proved that such dual amorphous phase structure is resulted by hydrogen-induced amorphous phase separation. According to EDX results, the dual amorphous phase structure consists of Ce-rich and Ni-Cu-rich domains with a size of about 5 nm which gradually form by element aggregation during hydrogen absorption. Meanwhile, it is also confirmed that the element aggregation is the precursor of hydrogen-induced crystallization as crystallization is observed in the Ni-Cu-rich domain. It is verified that the hydrogen-induced amorphous phase separation of the Mg-based amorphous alloys is tunable and can be used for obtaining superior hydrogenation performance. The hydrogen-induced structural evolution revealed in this work might inspire the development of new Mg-based hydrogen storage amorphous alloys. (C) 2021 Published by Elsevier B.V.

关键词

作者关键词Hydrogen storageMg-based amorphous alloyHydrogen-induced amorphous phase separationCrystallization

Keywords PlusGLASS-FORMING ABILITYSTORAGE PROPERTIESTHERMAL-STABILITYMETALLIC GLASSESCEKINETICSLACUNANOCRYSTALLINETHERMODYNAMICS

作者信息

通讯作者地址

Zhu, M.

(通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

通讯作者地址

Lin, H. J.

(通讯作者)

Jinan Univ, Inst Adv Wear & Corros Resistance & Funct Mat, Guangzhou 510632, Peoples R China

地址

1 South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China

2 Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

3 Jinan Univ, Inst Adv Wear & Corros Resistance & Funct Mat, Guangzhou 510632, Peoples R China

电子邮件地址hjlin@jnu.edu.cnmemzhu@scut.edu.cn

类别/分类

研究方向ChemistryMaterials ScienceMetallurgy & Metallurgical Engineering