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Boron Compounds as Stabilizers of a Complex Microstructure in a Co-B-based Catalyst for NaBH4 Hydrolysis

AuthorsArzac, G.M. ; Rojas, T. Cristina; Fernández-Camacho, A.
Heterogeneous catalysis
Hydrogen generation
Issue Date8-Aug-2011
CitationChemCatChem 3(8): 1305-1313 (2011)
AbstractCo⋅B-based materials are widely used as catalysts for hydrogen generation through sodium borohydride self-decomposition. In the mid 1990 s, 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 Co0 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.
Description9 páginas
Publisher version (URL)http://dx.doi.org/10.1002/cctc.201100101
Appears in Collections:(ICMS) Artículos
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