Effect of preparation method on Co-B catalytic activity for hydrogen generation from alkali NaBH4 solution

S. U. Jeong, E. A. Cho, SukWoo Nam, I. H. Oh, U. H. Jung, Sung Hyun Kim

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A Co-B catalyst is used to generate hydrogen from alkaline aqueous NaBH4 solutions. This study examined the properties of a Co-B catalyst prepared using different precursors (CoCl2 and CoSO4) and NaBH4 / Co2 + mole ratios (0.67, 1.5, 3) at calcination temperatures of 130, 250 and 450 {ring operator} C. As the calcination temperature was increased in N2 atmosphere mixed with 1% air, the typical amorphous structure of Co-B disappeared and the X-ray diffraction peaks corresponding to Co3 O4 became sharper. Metallic Co was formed when a NaBH4 / Co2 + mole ratio of 3 was used as the reductant with a corresponding reduction in the rate of H2 generation. The highest level of H2 generation (2400 ml/min g) was obtained with CoCl2 as the precursor, a NaBH4 / CO2 + mole ratio of 1.5 as the reductant, and a calcination temperature of 250 {ring operator} C.

Original languageEnglish
Pages (from-to)1749-1754
Number of pages6
JournalInternational Journal of Hydrogen Energy
Issue number12
Publication statusPublished - 2007 Aug 1



  • Co-B catalyst
  • Hydrogen generation
  • NaBH

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

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