A Highly Active Co-b Catalyst For Hydrogen Generation From Sodium Borohydride Hydrolysis

摘要

Co-B catalysts were prepared by the chemical reduction of CoCl_2 with NaBH_4 for hydrogen generation from borohydride hydrolysis. The catalytic properties of the Co-B catalysts were found to be sensitive to the preparation conditions including pH of the NaBH_4 solution and mixing manner of the precursors. A Co-B catalyst with a very high catalytic activity was obtained through the formation of a colloidal Co(OH)_2 intermediate. The ultra-fine particle size of 10 nm accounted for its super activity for hydrogen generation with a maximum rate of 26 L min~(-1) g~(-1) at 30 ℃. The catalyst also changed the hydrolysis kinetics from zero-order to first-order.