期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 15, 页码 2412-2416出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz1007998
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- Basic Energy Sciences of the Dept. of Energy [DE-FG02-05ER46256]
- National Science Foundation (NSF) [9724240, DMR-0520565]
The NaAlH4 system remains the archetype of hydrogen storage solids. However, the detailed mechanisms of the hydrogen reactions of NaAIH(4) remain unknown. We report Al-27 in situ nuclear magnetic resonance (NMR) spectroscopic data revealing an Al-bearing mobile species that could provide the large scale metal-atom transport needed for rehydriding. This new species forms under reaction conditions but can be captured at ambient temperature using excess H-2 pressure. The NMR measurements demonstrate that the species is highly mobile (at 20 degrees C) and carries both Al and H atoms. On the basis of the Al-27 shift (close to NaAlH4) and the disorder evident in X-ray diffraction the species is identified as highly defective NaAlH4, likely having a large AIH(3) vacancy concentration.
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