Journal
NANO LETTERS
Volume 21, Issue 8, Pages 3640-3648Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00757
Keywords
oxygen reduction reaction; oxygen evolution reaction; metal-organic frameworks; superstructure; Zn-air batteries
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- AIST
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A facile morphology regulation strategy was reported for synthesizing a spherical superstructure of MOF nanosheets, which were further pyrolyzed to fabricate carbon-based materials with abundant mesopores and metal-based nanoparticles. The obtained composites exhibited outstanding bifunctional activity for oxygen reduction/evolution reactions and great performances in Zn-air batteries.
The pyrolysis of metal-organic frameworks (MOFs) is an ingenious way to synthesize carbon-based materials with unique morphology for various applications including electrocatalysis. In this work, we reported a facile morphology regulation strategy for the synthesis of a spherical superstructure of MOF nanosheets. The use of metal hydroxide nanosheets on Zn particles as precursors/templates allowed MOFs with general polyhedron shape to form nanosheets and assemble into a spherical superstructure in the ligand solution. Further, a hollow spherical superstructure of carbon nanosheets decorated with metal-based nanoparticles was fabricated through the pyrolysis of MOF nanosheet superstructures at 950 degrees C, where the substrate/template Zn particle cores were evaporated away. The obtained composites possess carbon-based superstructures with abundant mesopores and metal-based nanoparticles with rich alloy/oxide interfaces. These features endow this MOF-derived carbon-based material with outstanding bifunctional activity for oxygen reduction/evolution reactions and great performances in Zn-air batteries.
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