280999 Solution Combustion Synthesis of Nanostructured Cobalt Oxide for Sodium Borohydride Hydrolysis

Wednesday, October 31, 2012: 2:10 PM
307 (Convention Center )
Lori J. Groven1, Teandra L. Pfeil1 and Timothee L. Pourpoint2, (1)School of Mechanical Engineering, Purdue University, West Lafayette, IN, (2)School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN

Cobalt oxide and LiCoO2 have recently been explored as catalysts for the hydrolysis of sodium borohydride and ammonia borane with promising results.  In several reports the hydrogen generation rate may meet that of typical, more expensive, noble metal catalysts such as Ru, Rh and Pt. However, the synthesis of such materials has generally been from decomposition of nitrates, acetates and mixtures thereof and can be quite slow (hours). This work reports the solution combustion synthesis of nanostructured cobalt oxide catalyst powder from cobalt nitrate-glycine solutions. The performance characterization of the catalyst for hydrolysis of sodium borohydride is compared to commercial Co and Co3O4 nanopowders.  Solution combustion synthesis is a cost effective, fast (minutes), reproducible method to synthesize powders with high purity (98-99%) and surface areas comparable to commercially available Co3O4 nanopowders (26-32 m2/g).  While X-ray diffraction analysis showed that the synthesized powders were not highly crystalline, the hydrogen generation rate, at 5 wt.% catalyst loading, was double that of commercial Co3O4 and Co nanopowders. Catalyst durability/reutilization will be discussed in detail.

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