High catalytic kinetic performance of amorphous CoPt NPs induced on CeO_x for H_2 generation from hydrous hydrazine

摘要

CeO_x-induced amorphization of CoPt nanoparticles (NPs) is achieved by a facile co-reduction method using sodium borohydride (NaBH_4) as the reducing agent at room temperature (298 K) under ambient atmosphere. The investigation results indicate that CeO_x plays a critical role in transferring the crystalline CoPt nanoalloy into the amorphous one. To our surprise, the resultant Co_(0.65)Pt_(0.30)(CeO_x)_(0.05) NPs exhibit high catalytic kinetic performance with 72.1% hydrogen (H_2) selectivity for the H_2 generation from hydrous hydrazine (N_2H_4) within only a few minute at 298 K. Although complete conversion is not achieved, but the initial turnover frequency value of 194.8 h ~1 for the present amorphous catalyst is much higher than that of crystalline one. Moreover, such a highly rapid catalyst may greatly encourage the practical application of hydrous N_2H_4 as a hydrogen storage material.