Journal
NANO RESEARCH
Volume 8, Issue 2, Pages 533-545Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0667-9
Keywords
hydrogen storage; complex hydrides; catalyst addition; nanocrystalline TiO2@C
Categories
Funding
- National Natural Science Foundation of China [51222101, 51171170, 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 Teams in Universities of the Ministry of Education of China [IRT13037]
- Fundamental Research Funds for the Central Universities [2014XZZX003-08]
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Adding a small amount of nanocrystalline TiO2@C (TiO2 supported on nanoporous carbon) composite dramatically decreases the operating temperatures and improves the reaction kinetics for hydrogen storage in NaAlH4. The nanocrystalline TiO2@C composite synthesized at 900 A degrees C (referred as TiO2@C-900) exhibits superior catalytic activity to other catalyst-containing samples. The onset dehydrogenation temperature of the TiO2@C-900-containing sample is lowered to 90 A degrees C; this is 65 A degrees C lower than that of the pristine sample. The dehydrogenated sample is completely hydrogenated at 115 A degrees C and 100 bar of hydrogen pressure with a hydrogen capacity of 4.5 wt.%. Structural analyses reveal that the Ti undergoes a reduction process of Ti4+-> Ti3+-> Ti2+-> Ti during the ball milling and heating processes, and further converts to Ti hydrides or forms Ti-Al species after rehydrogenation. The catalytic activities of Ti-based catalytic species decrease in the order Al-Ti-species > TiH0.71 > TiH2 > TiO2. This understanding guides further improvement in hydrogen storage properties of metal alanates using nanocrystalline transition metal-based additives.
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