多组元化合物掺杂改善MgH<sub>2</sub>释放氢的催化作用与催化机制研究进展

doi:10.11896/cldb.21100007

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Abstract The high structural thermodynamic stability and slow kinetics of hydrogen release of magnesium hydride have slowed down its practicalization process, and researchers have improved the problem by doping it with appropriate amounts of alloying elements or compounds with catalytic effects.
The difficulty of releasing hydrogen from MgH₂ hydride is related to its reaction enthalpy change and activation energy. The main mechanisms are:Mg nucleation growth in larger particles or bulk materials—hydrogen atom diffusion model on the surface of MgH₂ matrix; micron or nanoscale Mg nucleation growth—a hydrogen atom diffusion model for the newly formed magnesium outer layer. The catalytic effect of doping metal elements (M, RE) or binary oxides or halides is that the formed (M or RE)-H weakens the binding ability of Mg-H bonds. With the assistance of mechanical ball milling, the binary oxides or halides promote MgH₂ to form abundant defects and larger specific surface area, induce Mg surface modification, stimulate Mg-H dissociation, etc.
The contribution of doping ternary or multi-component compounds is to improve the microscopic properties of composite materials, reduce the initial temperature of hydrogen release and the activation energy of hydrogen release reaction, and increase the rate of hydrogen release; the main catalytic mechanism is that these compounds can adjust the hydrogen release reaction pathway of MgH₂, increase the reactive sites for releasing hydrogen, uniform distribution in MgH₂ matrix, unique chemical activity, products formed in situ by reaction with MgH₂—metal element, oxide or fluoride or alloy, hydride have multiphase synergy catalysis.
This article summarizes the catalytic effects and mechanisms of hydrogen-doped ternary or multi-element compounds to improve the release of hydrogen from MgH₂. The obstacles and mechanisms of hydrogen release from MgH₂, the catalytic effects of metals and compounds, especially the catalytic effects and mechanisms of ternary or multi-element compounds, are introduced.
In this paper, the catalytic action and mechanism of improving the ternary or multi-component compounds doped with hydrogen release from MgH₂ are summarized, and research measures to improve the thermodynamics and kinetics of hydrogen released by MgH₂ are put forward and look forward to its application prospects, hoping to provide a reference for the development of MgH₂ hydrides with mild use conditions and less severe thermodynamic/kinetic conditions.

Key words： MgH₂ hydride ternary or multi-element compound thermodynamics/kinetics catalytic mechanism

Published: 10 September 2023 Online: 2023-09-05

CLC number:

TG139.1

Fund:Natural Science Foundation of Hebei Province,China(E2021201032),2023 Hebei Province and Hebei University School-level Student Innovation and Entrepreneurship Training Project (S202310075044,2023232),Ministry of Education’s ‘Spring Fai Project’ Cooperative Research Project(202200397),and Hebei University 2022 Laboratory Opening Project(sy202266).

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	DONG Xiaoping
	ZHANG Zhaoqing
	YANG Liying
	XIN Shenghai
	LI Jian

Cite this article:

DONG Xiaoping,ZHANG Zhaoqing,YANG Liying, et al. Advances in the Catalytic Function and Catalytic Mechanism of Multi-component Compound Doping to Improve Hydrogen Desorption from MgH₂[J]. Materials Reports, 2023, 37(17): 21100007-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21100007 OR http://www.mater-rep.com/EN/Y2023/V37/I17/21100007

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