The aim of the present work is to investigate the kinetic properties of Co-B nanoparticles which are deposited on graphene sheets by simultaneous chemical reduction of Co þ2 and graphite oxides using NaBH 4 as the reducing agent. The reduced CoÀB/ graphene nanocomposites were characterized by X-ray diffraction, and the effects of the concentration of NaBH 4 , NaOH, and hydrolytic temperature were discussed in detail. The results show that the concentration of NaBH 4 and NaOH indeed exerted a significant impact on the hydrogen generation rate of Co-B/graphene catalysts. Reaction rate of hydrolysis first rises up and then decreases subsequently with the rising of NaOH and NaBH 4 concentration. The results show that the Co-B/graphene catalyst has the high catalytic activity with activation energy of 52.45 kJÁmol À1 , and showed high resistance against deterioration and stability as a function of time. The present method is promising for the synthesis of effective supported catalysts for hydrolysis of NaBH 4 . V C 2015 AIP Publishing LLC.
Co-B nanoparticles are deposited on graphene sheets by simultaneous chemical reduction of Co þ2 and graphite oxides using NaBH 4 as the reducing agent. The reduced CoÀB/graphene nanocomposites were characterized by X-ray diffraction, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results show that after reduction, not only considerable amount of functional groups has been removed but also exhibited formation of Co-B alloy on the graphene sheets. The catalytic activity of nanocomposites was investigated by the hydrolysis of NaBH 4 in aqueous solution. Graphene support material greatly enhances the hydrolysis of NaBH 4 with respect to graphite and active carbon supports, and chemical reduced graphene sheets can readily form stable aqueous colloids through electrostatic stabilization. The present method is promising for the synthesis of effective supported catalysts for hydrolysis of NaBH 4 . V C 2013 AIP Publishing LLC. [http://dx.
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