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Catalytic effects of V- and O-species derived from PrF3/V2C for efficient hydrogen storage in MgH2
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Catalytic effects of V- and O-species derived from PrF3/V2C for efficient hydrogen storage in MgH2
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Journal Article
Catalytic effects of V- and O-species derived from PrF3/V2C for efficient hydrogen storage in MgH2
2024
Overview
Magnesium hydride (MgH
2
) is considered as an ideal hydrogen storage material with excellent hydrogen capacity, but the slow kinetics impedes its application. Herein, an efficient additive of V
2
C MXene-anchored PrF
3
nanoparticles (PrF
3
/V
2
C) was synthesized, which presents excellent catalytic effect in improving the reversibility and stability of hydrogen storage in MgH
2
. The initial dehydrogenation temperature of the 5 wt.% PrF
3
/V
2
C-containing MgH
2
(182 °C) is 105 °C lower than that of pure MgH
2
, and 6.5 wt.% hydrogen is rapidly released from 5 wt.% PrF
3
/V
2
C-added MgH
2
sample in 6 min at 240 °C. In addition, 5 wt.% PrF
3
/V
2
C-containing MgH
2
sample possesses outstanding reversible hydrogen storage capability of 6.5 wt.% after 10 cycles of dehydrogenation and hydrogenation. Microstructure analysis shows that the introduction of Pr improves the stability of V-species (V
0
and V
2+
) and O-species (lattice oxygen (O
L
) and vacancy oxygen (O
V
)) formed during ball milling, promotes the interaction between V-species and O-species, and enhances their reversibility, which contributes to the significant improvement in re/dehydrogenation reversibility and cycling stability of MgH
2
. This study provides effective ideas and strategies for the purpose of designing and fabricating high-efficient catalysts for solid-state hydrogen storage materials.
Publisher
Tsinghua University Press
