Hydrogen-Induced Reversible Phase Transformations and Hydrogen Storage Properties of Mg-Ag-Al Ternary Alloys

时间:2018-05-25作者:浏览量:39


标题

Hydrogen-Induced Reversible Phase Transformations and Hydrogen Storage Properties of Mg-Ag-Al Ternary Alloys

作者

作者:Lu, YS (Lu, Yanshan)[1,2 ]; Wang, H (Wang, Hui)[1,2,3 ]; Liu, JW (Liu, Jiangwen)[1,2,3 ]; Li, ZM (Li, Ziming)[1,2 ]; Ouyang, LZ (Ouyang, Liuzhang)[1,2,3 ]; Zhu, M (Zhu, Min)[1,2,3 ]

期刊信息


JOURNAL OF PHYSICAL CHEMISTRY C


卷:120

期:48

页:27117-27127

DOI:10.1021/acs.jpcc.6b08291

出版年:DEC 8 2016

文献类型:Article

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摘要

Overly stable thermodynamics and sluggish kinetics hinder the practical applications of Mg-based hydrogen storage alloys. Compositional and structural modifications are important strategies in tuning these hydrogen storage properties. In this study, Mg-based Mg-Ag-Al ternary alloys were investigated to explore their performance as hydrogen storage alloys. Mg80Ag15Al5 exhibits a reaction pathway that differs from that in pure Mg, in which the intermediate phase, consisting of a new ternary solid solution MgAg(Al), reacts with MgH2 during dehydriding and contributes to an increase in the dehydriding equilibrium pressure (0.22 MPa at 300 degrees C) and to a reversible hydrogen storage capacity of 1.7 wt %. Adjusting the composition to Mg85Ag5Al10 results in a reversible hydrogen storage capacity of approximately 3.8 wt % and an elevated equilibrium pressure (0.26 MPa at 300 degrees C). These Mg-Ag-Al ternary alloys also show enhanced hydrogen sorption kinetics relative to that of Mg, and the apparent activation energies for hydrogenation and dehydrogenation of the Mg85Ag5Al10 sample are lowered to 74.5 kJ mol(-1) and 124.8 kJ mol(-1), respectively. This work demonstrates the possibility of exploring new hydrogen storage alloys via creating different reaction pathways for hydrogen-induced reversible phase transformations.

关键词

KeyWords Plus:SOLID-SOLUTION ALLOYS; MAGNESIUM HYDRIDE; SORPTION KINETICS; PRESSURE METHOD; DESORPTION; ABSORPTION; BEHAVIOR; DESTABILIZATION; ENTHALPY; SYSTEM

作者信息

作者信息

通讯作者地址:Zhu, M (通讯作者)

显示更多South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China.
通讯作者地址:Zhu, M (通讯作者)
显示更多South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China.
通讯作者地址:Zhu, M (通讯作者)
显示更多South China Univ Technol, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China.


地址:

显示更多[ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China
显示更多[ 2 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China
显示更多[ 3 ] South China Univ Technol, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China


电子邮件地址:memzhu@scut.edu.cn

出版商

AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA

类别分类

类别 / 分类

研究方向:Chemistry; Science & Technology - Other Topics; Materials Science

Web of Science 类别:Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary