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 ∼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.
#1Chuanbiao Bie(WUT: Wuhan University of Technology)H-Index: 1
#2Huogen Yu(WUT: Wuhan University of Technology)H-Index: 64
Last. Jiaguo Yu(WUT: Wuhan University of Technology)H-Index: 191
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Solving energy and environmental problems through solar-driven photocatalysis is an attractive and challenging topic. Hence, various types of photocatalysts have been developed successively to address the demands of photocatalysis. Graphene-based materials have elicited considerable attention since the discovery of graphene. As a derivative of graphene, nitrogen-doped graphene (NG) particularly stands out. Nitrogen atoms can break the undifferentiated structure of graphene and open the bandgap w...
#1Lei Lei(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Zhengjun Yao(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 26
Last. Keyu Yan(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 1
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Abstract The hydrangea-like Ni/NiO/C composites have been successfully synthesized by in-situ pyrolysis stemmed from Ni-MOFs. The composition and structure can be adjusted by controlling the pyrolysis temperature, and it leads to the graphitization degree and electromagnetic parameters. A broad effective absorption bandwidth of the composite up to 5.67 GHz with the maximum reflection loss of −47.72 dB in 1.9 mm thickness. The results demonstrate hydrangea-like Ni/NiO/C composites have superior m...
Photocatalytic syngas (CO and H2) production with CO2 as gas source not only ameliorates greenhouse effect, but also produces valuable chemical feedstocks. However, traditional photocatalytic system requires noble metal or suffers from low yield. Here, we demonstrate that S vacancies ZnIn2S4 (VS-ZnIn2S4) nanosheets are an ideal photocatalyst to drive CO2 reduction into syngas. It is found that building S vacancies can endow ZnIn2S4 with stronger photoabsorption, efficient electron-hole separatio...
Abstract Polluted water and exhaust gas released from industrial activities cause a series of environmental issues such as heavy metals accumulation and greenhouse effect. Here, we have proposed an “adsorbent-to-photocatalyst” conversion strategy to bridge water remediation with photocatalytic CO2 reduction. Harmful heavy metals in polluted water are removed and collected by adsorbents, which are converted into valuable photocatalysts for CO2 reduction without secondary treatment. Calcium silica...
Last. Da Zhou(Ha Tai: Xiamen University)H-Index: 12
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Two-dimensional metal-organic layers (MOLs) from alternatively connected benzene-tribenzoate ligands and Zr6(μ3-O)4(μ3-OH)4 or Hf6(μ3-O)4(μ3-OH)4 secondary building units can be prepared in gram scale via solvothermal synthesis. However, the reason why the monolayers did not pack to form thick crystals is unknown. Here we investigated the surface structure of the MOLs by a combination of sum-frequency generation spectroscopy, nanoscale infrared microscopy, atomic force microscopy, aberration-cor...
Last. Hua Wang(TJU: Tianjin University)H-Index: 16
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The facile synthesis of low-cost, eco-friendly photocatalysts with high charge separation efficiency and CO2 adsorption capacity for efficient photocatalytic CO2 reduction remains a challenge. Herein, a hollow structured p-n heterojunction catalyst, polydopamine (PDA)-ZnO/Co3O4, was successfully synthesized by pyrolyzing bimetallic ZnCo-ZIFs, followed by modification with PDA. Through optimizing the Zn/Co ratio, a high separation efficiency of the photogenerated electron–hole pairs has been achi...
Selective photoreduction of CO2 into a given product is a great challenge but desirable. Inspired by natural photosynthesis occurring in the hierarchical networks over non-precious molecular metal catalysts, we demonstrate an integration of single Ni sites into the hexagonal pores of polyimide covalent organic frameworks (PI-COFs) for selective photoreduction of CO2 to CO. The single Ni sites in the hexagonal pores of the COFs serve as active sites for CO2 activation and conversion, while the PI...
Last. Shaowen Cao(MPG: Max Planck Society)H-Index: 62
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Polymeric carbon nitride (CN) is one of the most promising metal-free photocatalysts to alleviate energy crisis and environmental pollution. Loading cocatalysts is regarded as an effective way to i...
Last. Yanli Zhao(NTU: Nanyang Technological University)H-Index: 89
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Photocatalysts derived from semiconductor heterojunctions that harvest solar energy and catalyze desired reactions still suffer from low solar-to-hydrogen conversion efficiency. In this work, MXene (Ti3C2TX) nanosheets (MNs) are used to support the in-situ growth of ultrathin ZnIn2S4 nanosheets (UZNs), successfully producing sandwich-like hierarchical heterostructures (UZNs-MNs-UZNs) for efficient photocatalytic H2 evolution. Opportune lateral epitaxy of UZNs on the surface of MNs simultaneously...
#1Weiyi Chen(SCUT: South China University of Technology)H-Index: 4
#2Bin Han(SCUT: South China University of Technology)H-Index: 12
Last. Zhang Lin(SCUT: South China University of Technology)H-Index: 71
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Abstract Converting carbon dioxide (CO2) to multiple energy-rich chemicals by photocatalysis could validly mitigate the severe issues of climate changes and energy shortages. Exploring efficient catalysts for enhancing the performance of CO2 photoreduction is still challenging. Herein, a novel three-dimensional hierarchical Co-Co layered double hydroxide/Ti3C2TX nanosheets (Co-Co LDH/TNS) nanoarray was successfully prepared via an in-situ MOF-derived strategy. This wise design rationally integra...
