Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Nanostructures and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Nanoscale. 2017 Sep 21;9(36):13538-13545. doi: 10.1039/c7nr05085b.
The construction of core-shell structures through surface coating, and then making use of the synergistic effects between the core and shell to design and synthesize heterogeneous catalysts is a hot topic in the heterogeneous catalysis field. Developing a general coating route with functional shell materials is further highly desirable. Here we found that a poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol) (PZS) layer can be generally coated on various substrates with different components and morphologies, including metal oxides, noble metal nanoparticles, carbon materials and metal-organic frameworks (MOFs). In addition, the coating thickness could be well controlled through simply adjusting the amount of monomers. Taking advantage of the heteroatoms in the PZS layer and the synergistic effect between the core and shell, new methods for fabrication of co-doped hollow carbon shell catalysts and transition metal phosphide nanoparticles were developed. As a proof-of-concept application, the N, P, S-doped hollow carbon shells prepared by calcination of a ZnCo-ZIFs@PZS core-shell structure could act as a good carbo-catalyst for selective oxidation of C-H bonds in water.
通过表面涂层构建核壳结构，然后利用核壳之间的协同效应来设计和合成多相催化剂，这是多相催化领域的一个热门话题。进一步发展具有功能壳层材料的通用涂层路线是非常需要的。在这里，我们发现聚（环三磷腈-共-4,4'-磺酰二苯酚）（PZS）层可以普遍地涂覆在具有不同成分和形态的各种基底上，包括金属氧化物、贵金属纳米粒子、碳材料和金属有机骨架（MOFs）。此外，通过简单地调整单体的用量，可以很好地控制涂层的厚度。利用 PZS 层中的杂原子和核壳之间的协同效应，开发了制备共掺杂空心碳壳催化剂和过渡金属磷化物纳米粒子的新方法。作为概念验证应用，通过煅烧 ZnCo-ZIFs@PZS 核壳结构制备的 N、P、S 掺杂空心碳壳可以作为一种良好的碳催化剂，用于在水中选择性氧化 C-H 键。
