Hollow Ni–Co–B amorphous alloy nanospheres: facile fabrication via vesicle-assisted chemical reduction and their enhanced catalytic performances
作者:W. Wei、Y. Zhao、S. C. Peng、H. Y. Zhang、Y. P. Bian、H. X. Li、H. Li
DOI:10.1039/c4ta04533e
日期:——
In this paper, we develop a simple vesicle-assisted chemical reduction approach for synthesizing hollow NiâCoâB nanospheres. With various characterization techniques, the resulting NiâCoâB nanospheres are identified as amorphous alloys with a hollow chamber. Coexistence of NiII and CoII species plays a significant role in fabricating hollow nanospheric structures, because only solid nanoparticles can be obtained in the presence of a mono-metallic precursor. During liquid-phase hydrogenation of 2-ethyl-2-hexenaldehyde, hollow NiâCoâB catalyst displays significant bi-site catalysis from bimetals and delivers much greater activity as well as better selectivity than associated with the dense NiâCoâB catalyst. Additionally, this catalyst is also easily handled in liquid-phase reactions due to its lower density and magnetic property. The material design concept presented in this work opens a new avenue for the development of hollow non-noble metallic nanospheres and will draw more attention in the foreseeable future.
在本文中,我们开发了一种简单的囊泡辅助化学还原法来合成空心镍钴纳米球。通过各种表征技术,我们发现所得到的镍钴纳米球是一种具有空腔的非晶合金。NiII 和 CoII 物种的共存在制造空心纳米球结构中起着重要作用,因为只有在单金属前驱体存在的情况下才能获得固体纳米粒子。在 2-ethyl-2-hexenaldehyde 的液相氢化过程中,中空 NiâCoâB 催化剂显示出显著的双金属双位点催化作用,与致密 NiâCoâB 催化剂相比,它具有更高的活性和更好的选择性。此外,由于密度较低且具有磁性,这种催化剂在液相反应中也很容易处理。这项研究提出的材料设计理念为开发空心非贵金属纳米球开辟了一条新途径,在可预见的未来将吸引更多的关注。