Journal
CHEMCATCHEM
Volume 3, Issue 8, Pages 1305-1313Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201100101
Keywords
boron; cobalt; heterogeneous catalysis; hydrogen generation; nanoparticles
Categories
Funding
- Spanish MICINN [CTQ2009-13440]
- Junta de Andalucia
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Co-B-based materials are widely used as catalysts for hydrogen generation through sodium borohydride self-decomposition. In the mid 1990s, the aqueous and organic chemistry involved in Co-B synthesis and handling was studied. Nevertheless, the exact microstructure of these catalysts has remained unsolved. Herein we present an exhaustive study which shows a new and complete microstructural view of a Co-B-based material together with the chemistry of the cobalt and boron involved. By using nanoscale-resolution microscopy and spectroscopy techniques, we have elucidated the role of boron compounds as stabilizers in a complex microstructure, which also explains its high catalytic performance and long-term stability. The catalyst is proposed to be made up of 1-3 nm hcp Co-0 nanoparticles embedded in amorphous CoxB (x = 1, 2, 3), CoxOy, Co(BO2)(2), and B2O3 phases alternatively or all together. All of these amorphous phases protect the nanocrystalline metallic core from growth and oxidation.
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