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 (NH₃BH₃, 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-Fe₃O₄) 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-Fe₃O₄ catalysts exhibit good catalytic activity and excellent recyclability for H₂ 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 mol_H2 ·mol_Pd ⁻¹·min⁻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-Fe₃O₄ could be efficiently applied in the utilization of hydrogen energy.