Cobalt hollow nanospheres: controlled synthesis, modification and highly catalytic performance for hydrolysis of ammonia borane

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2017,（5）
• 页码范围: 326-331
• 页数: 6页
• 语种: 英文

摘要

Size tunable cobalt hollow nanospheres with high catalytic activity for the ammonia borane (AB) hydrolysis have been synthesized by using the solvothermal method.The complexation between Co2+ and ethylenediamine is observed to be critical for the formation of the cobalt hollow nanospherical structure.The morphology of the cobalt hollow nanospheres can be regulated by adjusting the original ethylenediamine/ethanol volume ratio,reaction time and temperature.Impressively,the magnetic property study reveals that the coercivity of the as-synthesized cobalt hollow nanospheres is much enhanced compared with that of bulk cobalt materials.Meanwhile,Co/Pt bimetal hollow nanospheres (CoPtHS) and graphene-cobalt hollow composite nanospheres (CoHS-rGO) have also been explored.In comparison with the cobalt hollow nanospheres,both the CoPtHS and CoHS-rGO show higher catalytic activities and better repeatability for the catalytic hydrogen generation from AB hydrolysis.Moreover,it is noted that these catalysts could be recycled by using the magnetic separation method.