Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 29, Pages 11155-11161Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta01422g
Keywords
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Funding
- National Natural Science Foundation of China [51171170, 51222101, 51025102]
- Ministry of Science and Technology of China [2010CB631304]
- Research Fund for the Doctoral Program of Higher Education of China [20130101110080, 20130101130007]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Fundamental Research Funds for the Central Universities [2014XZZX003-08]
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Adding a small amount of Co3O4 significantly reduces the operating temperatures of dehydrogenation and improves the hydrogen storage reversibility of the LiBH4-2LiNH(2) system. The LiBH4-2LiNH(2)-0.05/3Co(3)O(4) composite desorbs similar to 9.9 wt% hydrogen by a four-step reaction with a 96 degrees C reduction in the midpoint temperature with respect to the pristine sample. The first and third steps of the dehydrogenation of the 0.05/3Co(3)O(4)-added sample are endothermic in nature, which is different from the pristine sample. Upon thermal dehydrogenation, the Co3O4 additive undergoes a series of chemical transformations and finally converts to the metallic Co, which is responsible for the improved thermodynamics and kinetics of the Co3O4-added sample. More importantly, 1.7 wt% of hydrogen is recharged into the 0.05/3Co(3)O(4)-added system under 110 bar hydrogen at 220 degrees C, which is superior to the pristine system.
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