Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 23, Pages 13625-13630Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta03019a
Keywords
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Funding
- Shanghai Pujiang Program [19PJ1410400]
- Natural Science Foundation of Shanghai [20ZR1464000]
- National Natural Science Foundation of China [21878322, 22075309]
- Science and Technology Commission of Shanghai [19ZR1479200]
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Covalent organic frameworks (COFs) and metal-organic frameworks (MOFs) have been extensively studied for their designable and controllable structures, which can be used in a wide range of applications. A new COF@MOF-derived catalyst with high stability and catalytic activity for oxygen reduction reaction has been successfully synthesized, demonstrating excellent long-term stability.
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.
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