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

作　　者：Wangya Wei Zumin Wang Jie xu Lingbo Zong Kun Zhao Hao Wang Haiyan Li Ranbo Yu 

机构地区：[1]Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Centre for Future Materials, University of Southern Queensland, Toowoomba Queensland 4350, Australia [3]Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

出　　处：《Science Bulletin》2017年第5期326-331,共6页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21271021,51472025,21671016);Beijing Nova Programme Interdisciplinary Cooperation Project

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(Co Pt HS) and graphene-cobalt hollow composite nanospheres(Co HS-r GO) have also been explored. In comparison with the cobalt hollow nanospheres, both the Co Pt HS and Co HS-r GO 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.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 Co^2＋ 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.

关 键 词：Cobalt hollow nanospheres Controlled synthesis MODIFICATION CATALYSIS HYDROLYSIS 

分 类 号：O643.36[理学—物理化学]