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Catalytic application of shape-controlled Cu 2O particles protected by Co 3O 4 nanoparticles for hydrogen evolution from ammonia borane

Title
Catalytic application of shape-controlled Cu 2O particles protected by Co 3O 4 nanoparticles for hydrogen evolution from ammonia borane
Authors
Yamada Y.Yano K.Fukuzumi S.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2012
Journal Title
Energy and Environmental Science
ISSN
1754-5692JCR Link
Citation
vol. 5, no. 1, pp. 5356 - 5363
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Cu 2O particles are active catalysts for hydrogen evolution from ammonia borane (AB) by hydrolysis, however, Cu 2O particles easily form agglomerates as a result of highly reduced conditions during the reaction. In order to suppress agglomerate formation, capping of Cu 2O with organic reagents or inorganic materials was performed and the catalytic reactivity in AB hydrolysis was examined. Among the examined methods, capping of Cu 2O particles with Co 3O 4 nanoparticles was the most effective to avoid agglomerate formation of Cu 2O particles. The finding enabled us to examine the shape effect of Cu 2O particles on the catalytic reactivity in AB hydrolysis in the presence of Co 3O 4 nanoparticles. Comparisons of turnover frequencies for hydrogen evolution of Cu 2O-Co 3O 4 composites, in which Cu 2O particles were in the shape of 50-facets, cube, octahedron or rhombicuboctahedron, indicated that the composite with Cu 2O with the shape of 50-facets showed more than 7-fold higher hydrogen evolution rate normalized by surface area than the composite with Cu 2O with the octahedral shape. The size and shape effects of Co 3O 4 nanoparticles were also investigated on their ability to protect Cu 2O from agglomeration. Comparisons of the catalytic reactivity of Cu 2O particles decorated with Co 3O 4 nanoparticles of different sizes and shapes in terms of amounts and rates of hydrogen evolved by AB hydrolysis indicated that the size of Co 3O 4 nanoparticles is more important than the shape to exhibit high catalytic reactivity. © 2011 The Royal Society of Chemistry.
DOI
10.1039/c1ee02639a
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자연과학대학 > 화학·나노과학전공 > Journal papers
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