Wei Wangya, Wang Zumin, Xu Jie, Zong Lingbo, Zhao Kun, Wang Hao, Li Haiyan, Yu Ranbo
Department of Physical Chemistry, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Centre for Future Materials, University of Southern Queensland, Toowoomba Queensland 4350, Australia.
Sci Bull (Beijing). 2017 Mar 1;62(5):326-331. doi: 10.1016/j.scib.2017.01.012. Epub 2017 Jan 16.
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 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.
采用溶剂热法合成了对氨硼烷（AB）水解具有高催化活性的尺寸可调钴空心纳米球。观察到Co与乙二胺之间的络合对于钴空心纳米球结构的形成至关重要。通过调节原始乙二胺/乙醇体积比、反应时间和温度，可以调控钴空心纳米球的形貌。令人印象深刻的是，磁性研究表明，所合成的钴空心纳米球的矫顽力比块状钴材料有很大提高。同时，还探索了Co/Pt双金属空心纳米球（CoPtHS）和石墨烯-钴空心复合纳米球（CoHS-rGO）。与钴空心纳米球相比，CoPtHS和CoHS-rGO对AB水解制氢均表现出更高的催化活性和更好的重复性。此外，值得注意的是，这些催化剂可以通过磁分离方法回收利用。
