Collagen-graphene oxide magnetic hybrids anchoring Pd(0) catalysts for efficient H2 generation from ammonia borane.

Because of the rapid development in the utilization hydrogen energy, various hydrogen storage techniques have attracted much attention. Among them, the hydrolysis of ammonia borane (NH 3 BH 3 , AB) over high-efficient and low-cost catalysts is one of the most interesting pathways. In this work, the magnetic collagen powder-graphene oxide hybrids (CGP-GO-Fe 3 O 4) are synthesized by a facile self-assembly method combined with co-precipitation synthesis routes. Then, the hybrids are employed to immobilize palladium nanoparticles with an in-situ reduction strategy. The as-prepared Pd/CGP-GO-Fe 3 O 4 catalysts exhibit good catalytic activity and excellent recyclability for H 2 generation from AB. Under the present reaction conditions, the activation energy and turnover frequency for the hydrolysis of AB are 36.5 kJ mol−1 and 27.4 m o l H 2 · m o l P d − 1 · m i n − 1 , respectively. In addition, the hydrolysis reaction is found to be of 0.93 and 0.40 orders with respect to the palladium and AB concentrations, respectively. The results demonstrate that Pd/CGP-GO-Fe 3 O 4 could be efficiently applied in the utilization of hydrogen energy. Image 1 • A new magnetic organic-inorganic hybrid (CGP-GO-Fe 3 O 4) was facilely assembled. • Pd/CGP-GO-Fe 3 O 4 exhibited superior catalytic performance for AB hydrolysis. • The magnetic catalysts obtained can be easily separated from the reaction system. [ABSTRACT FROM AUTHOR]