Journal
INORGANIC CHEMISTRY
Volume 60, Issue 14, Pages 10738-10748Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c01443
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Funding
- National Key Research and Development Program of China [2020YFA0710303]
- National Natural Science Foundation of China [U1905215, 52072076]
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The study utilizes metal-organic monolayers to prepare carbon-wrapped metal nanoparticles, improving the accessibility of active metal sites and accelerating electron transfer rates, resulting in significantly enhanced catalytic activity.
The metal/carbon composites prepared by direct pyrolysis of metal-organic frameworks (MOFs) are regarded as ideal catalysts. However, conventional MOFs show a three-dimensional bulk structure. For bulk MOF-derived catalysts, most active metal sites are confined in the interior and not fully utilized. In this work, metal-organic monolayers (MOLs) are used as the starting precursors to prepare carbon-wrapped metal nanoparticles, which are further employed as catalysts for photocatalytic CO2 reduction. The as-prepared Ni-MOLs and Co-MOLs have an ultrathin thickness of similar to 1 nm. It is interestingly found that their derived Ni@C and Co@C nanoparticles are highly dispersive and connected with each other like a piece of paper. As compared with bulk MOF-derived counterparts, MOL-derived catalysts increase the accessibility of active metal sites, which can accelerate electron transfer from photosensitizers to Ni@C and Co@C nanoparticles. In this way, the catalytic activity can be greatly improved. Besides, the magnetic nature of Ni@C and Co@ C nanoparticles enables the easy separation and recycling of catalysts. It is expected that this work will provide instructive guidelines for the rational design of MOL-derived catalysts.
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