Song Dandan, Zheng Jing, Liu Libin, Alsulami Hamed, Amin Kutbi Marwan, Xu Jingli, Zhang Min
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Dalton Trans. 2020 Feb 25;49(8):2570-2577. doi: 10.1039/c9dt04789a.
The encapsulation of small non-noble metal nanoparticles (NPs) within an inorganic layer has received considerable attention owing to their enhanced stability and high catalytic activity. Using a combination of emulsion-free polymerization, inner RF-Ni2+ and outer SiO2 coating, and subsequent carbonization treatment, herein, we have fabricated worm-like structured Ni-based composites in which a high density of nickel NPs are embedded in a carbon layer and also entrapped by SiO2 nanocages. We find that the carbonization temperature plays a vital role in adjusting the size of the Ni NPs. A detailed examination of the encapsulated nickel particles synthesized at 700 °C exhibited the best performance on the catalysis of the reduction of 4-NPs. Moreover, owing to the good alloying ability of the Ni NPs with noble metal NPs, the Ni-Pd alloy NPs are also entrapped in the SiO2 nanocages, which exhibit better performance on the catalysis than the Ni-based composites. The encapsulation of Ni-Pd alloys within SiO2 nanocages also improves stability against agglomeration and metal separation during catalytic operation.
由于其增强的稳定性和高催化活性，将小的非贵金属纳米颗粒（NPs）封装在无机层中受到了广泛关注。在此，通过无皂乳液聚合、内部射频镍离子和外部二氧化硅涂层以及随后的碳化处理相结合，我们制备了蠕虫状结构的镍基复合材料，其中高密度的镍纳米颗粒嵌入碳层并被二氧化硅纳米笼捕获。我们发现碳化温度在调节镍纳米颗粒的尺寸方面起着至关重要的作用。对在700℃合成的封装镍颗粒的详细研究表明，其在催化还原4-硝基苯酚方面表现出最佳性能。此外，由于镍纳米颗粒与贵金属纳米颗粒具有良好的合金化能力，镍-钯合金纳米颗粒也被捕获在二氧化硅纳米笼中，其在催化方面表现出比镍基复合材料更好的性能。将镍-钯合金封装在二氧化硅纳米笼中还提高了催化操作过程中抗团聚和金属分离的稳定性。
