Hierarchical confinement of PtZn alloy nanoparticles and single-dispersed Zn atoms on COF@MOF-derived carbon towards efficient oxygen reduction reaction
| Autor: | Yu Guo, Qing Xu, Ping Wu, Gaofeng Zeng, Zheng Jiang, Shuai Yang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
010405 organic chemistry Renewable Energy Sustainability and the Environment Alloy Intermetallic Nanoparticle chemistry.chemical_element General Chemistry engineering.material 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry Chemical engineering Photocatalysis engineering General Materials Science Absorption (chemistry) Pyrolysis Carbon |
| Zdroj: | Journal of Materials Chemistry A. 9:13625-13630 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Covalent organic frameworks (COFs) and metal–organic frameworks (MOFs) are attracting significant attention for their enormous range of applications because of their designable and controllable skeletons and porosities. Integrated MOF/COF materials are well developed in gas absorption, photocatalysis, and chemical sensors. Here, an ultrastable COF@MOF-derived catalyst has been first synthesized, in which hollow carbon acts as a support to confine Pt–Zn intermetallic nanoparticles and isolated Zn atoms. The COF on the surface of the MOF facilitates the construction of a hollow structure, and the MOF prevents the collapse and aggregation of the COF coating in the pyrolysis process. The resulting catalyst has Pt–Zn intermetallic nanoparticles with an average size of 3 nm supported on the hollow carbons with atomic Zn distributions. Based on the combination of the active Zn atoms and Pt–Zn clusters/nanoparticles, the catalyst displays high catalytic activity towards ORR with half-wave potentials of 0.85 and 0.85 V, which were more positive than those of Pt/C in alkaline and acidic conditions, respectively. More importantly, the catalyst exhibits excellent long-term stability over 20 hours. This work provides new guidance for designing core–shell MOF/COF materials for electrocatalysts, which is key to systems for energy conversion and storage. |
| Databáze: | OpenAIRE |
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