Enhancing hydrogen storage properties of MgH2 through addition of Ni/CoMoO4 nanorods

被引：81

作者：

Huang, T. ^{[1
,2
,3
,4
,5
,6
]}

Huang, X. ^{[7
]}

Hu, C. ^{[1
,2
]}

Wang, J. ^{[1
,2
]}

Liu, H. ^{[6
]}

Ma, Z. ^{[1
,2
]}

Zou, J. ^{[1
,2
,3
,4
,5
]}

Ding, W. ^{[1
,2
,3
,4
,5
]}

机构：

[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Ctr Hydrogen Sci, Shanghai 200240, Peoples R China

[4] Shanghai Mg Power Tech Co Ltd, Shanghai 200240, Peoples R China

[5] Shanghai Jiao Tong Univ, Shanghai Engn Res Ctr Mg Mat & Applicat, Shanghai 200240, Peoples R China

[6] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[7] China Acad Engn Phys, Inst Mat, Jiangyou 621908, Sichuan, Peoples R China

来源：

MATERIALS TODAY ENERGY | 2021年 / 19卷

基金：

中国国家自然科学基金;

关键词：

Bimetallic oxide nanorods; Magnesium hydride; De/hydriding kinetics; Dual role; Facilitated hydrogen pump; SYNERGISTIC CATALYSIS; CARBON NANOTUBES; NANOPARTICLES; TRANSITION; CO; PERFORMANCE; NB;

D O I：

10.1016/j.mtener.2020.100613

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, one-dimensional NiMoO4 and CoMoO4 nanorods are prepared and introduced into MgH2 to improve its hydrogen storage properties. It is observed that the MgH2 -NiMoO4 system exhibits lower dehydrogenation temperature and faster kinetics than the MgH2 -CoMoO4 system and pure MgH2, indicating the superior promoting effect of NiMoO4 over CoMoO4. Concretely, NiMoO4 reacts with MgH2 during the first dehydrogenation to in situ form Mg2Ni and Mo-0, both of which are crucial factors for the following hydrogen cycling process. The 'Mg2Ni/Mg2NiH4' mutual transformation upon hydrogen release/uptake is the well-known 'hydrogen pump' effect which boosts the hydrogen storage performance of MgH2. Moreover, theoretical calculations reveal the dual roles of Mo-0 played for the hydrogen storage in MgH2: i) it accelerates the hydrogen de/absorption of MgH2 through weakening the Mg-H bonding; ii) it facilitates the mutual 'Mg2Ni/Mg-2 NiH4' transformation as the formation energy of Mg2NiH4 decreases under the influence of Mo-0, which we call 'facilitated hydrogen pump' effect in this work. Ascribing to the collaborative action between Ni- and Mo- containing species, the hydrogen storage kinetics of MgH2 has been accelerated. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11

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