Mesoporous Co-B nanocatalyst for efficient hydrogen production by hydrolysis of sodium borohydride

摘要

Two types of mesoporous Co-B nanocatalysts were prepared by the reduction of cobalt chloride with Sodium Borohydride (SBH) in the presence of cationic and non-ionic surfactant templates, namely n-cetyl-trimethyl-ammonium bromide (CTAB) and Pluronic (P123) respectively. Nitrogen adsorption-desorption isotherms revealed the presence of slit-like pores on the catalyst surface which provide high effective surface area. These surface enhanced catalysts were tested for hydrogen production by hydrolysis of sodium borohydride. The mesoporous Co-B catalysts showed much higher activity (4 times) in comparison to the non-porous Co-B, which can be attributed to the higher surface area of the mesoporous structures. Co-B/P123 catalyst showed the highest hydrogen generation rate owing to the presence of wide uniform pores which facilitated easier interaction of the reactants to release hydrogen. The lack of stability in the pore structure is observed at elevated temperatures for both the mesoporous Co-B catalyst.