Preparation and catalytic effect of porous Co3O4 on the hydrogen storage properties of a Li-B-N-H system

A porous Co3O4 with a particle size of 1–3 μm was successfully prepared by heating Co-based metal organic frameworks MOF-74（Co） up to 500 °C in air atmospheric conditions. The as-prepared porous Co3O4 significantly reduced the dehydrogenation temperatures of the LiBH4-2LiNH2 system and improved the...

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Bibliographic Details
Published in:Progress in natural science 2017-02, Vol.27 (1), p.132-138
Main Authors: Li, You, Zhang, Yi, Gao, Mingxia, Pan, Hongge, Liu, Yongfeng
Format: Article
Language:English
Subjects:
Amides
Borohydrides
Complex hydrides
Dehydrogenation
Hydrogen storage
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Summary:A porous Co3O4 with a particle size of 1–3 μm was successfully prepared by heating Co-based metal organic frameworks MOF-74（Co） up to 500 °C in air atmospheric conditions. The as-prepared porous Co3O4 significantly reduced the dehydrogenation temperatures of the LiBH4-2LiNH2 system and improved the purity of the released hydrogen. The LiBH4-2LiNH2-0.05/3Co3O4 sample started to release hydrogen at 140 °C and released hydrogen levels of approximately 9.7 wt% at 225 °C. The end temperature for hydrogen release was lowered by 125 °C relative to that of the pristine sample. Structural analyses revealed that the as-prepared porous Co3O4 is in-situ reduced to metallic Co, which functions as an active catalyst, reducing the kinetic barriers and lowering the dehydrogenation temperatures of the LiBH4-2LiNH2 system. More importantly, the porous Co3O4-containing sample exhibited partially improved reversibility for hydrogen storage in the LiBH4-2LiNH2 system.
ISSN:1002-0071
DOI:10.1016/j.pnsc.2016.12.010