A Mechanistic Analysis of Phase Evolution and Hydrogen Storage Behavior in Nanocrystalline Mg(BH4)2 within Reduced Graphene Oxide

Title
A Mechanistic Analysis of Phase Evolution and Hydrogen Storage Behavior in Nanocrystalline Mg(BH4)2 within Reduced Graphene Oxide
Authors
정소희Tae Wook HeoJulia OktawiecRongpei ShiShinYoung KangJames L. WhiteAndreas SchneemannEdmond W. ZaiaLiwen F. WanKeith G. RayYi-Sheng LiuVitalie StavilaJinghua GuoJeffrey R. LongBrandon C. WoodJeffrey J. Urban
Issue Date
2020-01
Publisher
ACS Nano
Citation
VOL 14, NO 2-1756
Abstract
Magnesium borohydride (Mg(BH4)2, abbreviated here MBH) has received tremendous attention as a promising onboard hydrogen storage medium due to its excellent gravimetric and volumetric hydrogen storage capacities. While the polymorphs of MBH―alpha (α), beta (β), and gamma (γ)―have distinct properties, their synthetic homogeneity can be difficult to control, mainly due to their structural complexity and similar thermodynamic properties. Here, we describe an effective approach for obtaining pure polymorphic phases of MBH nanomaterials within a reduced graphene oxide support (abbreviated MBHg) under mild conditions (60-190 °C under mild vacuum, 2 Torr), starting from two distinct samples initially dried under Ar and vacuum. Specifically, we selectively synthesize the thermodynamically stable α phase and metastable β phase from the γ-phase within the temperature range of 150-180 °C. The relevant underlying phase evolution mechanism is elucidated by theoretical thermodynamics and kinetic nucleation modeling. The resulting MBHg composites exhibit structural stability, resistance to oxidation, and partially reversible formation of diverse [BH4]- species during de- and rehydrogenation processes, rendering them intriguing candidates for further optimization toward hydrogen storage applications.
URI
http://pubs.kist.re.kr/handle/201004/73337
ISSN
1936-0851
Appears in Collections:
KIST Publication > Article
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