Journal
SCIENCE
Volume 323, Issue 5913, Pages 492-495Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1165884
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Funding
- Air Force Office of Scientific Research [FA9550-04-1-0066, FA9550-05-1-0186]
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The reactions of metal clusters with small molecules often depend on cluster size. The selectivity of oxygen reactions with aluminum cluster anions can be well described within an electronic shell model; however, not all reactions are subject to the same fundamental constraints. We observed the size selectivity of aluminum cluster anion reactions with water, which can be attributed to the dissociative chemisorption of water at specific surface sites. The reactivity depends on geometric rather than electronic shell structure. Identical arrangements of multiple active sites in Al-16(-), Al-17(-), and Al-18(-) result in the production of H-2 from water.
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