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Pd-Nanoparticles Embedded Metal–Organic Framework-Derived Hierarchical Porous Carbon Nanosheets as Efficient Electrocatalysts for Carbon Monoxide Oxidation in Different Electrolytes
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    Pd-Nanoparticles Embedded Metal–Organic Framework-Derived Hierarchical Porous Carbon Nanosheets as Efficient Electrocatalysts for Carbon Monoxide Oxidation in Different Electrolytes
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    Langmuir

    Cite this: Langmuir 2022, 38, 36, 11109–11120
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    https://doi.org/10.1021/acs.langmuir.2c01841
    Published August 30, 2022
    Copyright © 2022 American Chemical Society

    Abstract

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    Rational synthesis of Co-ZIF-67 metal–organic framework (MOF)-derived carbon-supported metal nanoparticles is essential for various energy and environmental applications; however, their catalytic activity toward carbon monoxide (CO) oxidation in various electrolytes is not yet emphasized. Co-ZIF-67-derived hierarchical porous carbon nanosheet-supported Pd nanocrystals (Pd/ZIF-67/C) were prepared using a simple microwave-irradiation approach followed by carbonization and etching. Mechanistically, during microwave irradiation, triethyleneamine provides abundant reducing gases that promote the formation of Pd nanoparticles/Co-Nx in porous carbon nanosheets with the assistance of ethylene glycol and also form a multimodal pore size. The electrocatalytic CO oxidation activity and stability of Pd/ZIF-67/C outperformed those of commercial Pd/C and Pt/C catalysts by (4.2 and 4.4, 4.0 and 2.7, 3.59 and 2.7) times in 0.1 M HClO4, 0.1 M KOH, and 0.1 M NaHCO3, respectively, due to the catalytic properties of Pd besides the conductivity of Co-Nx active sites and delicate porous structures of ZIF-67. Notably, using Pd/ZIF-67/C results in a higher CO oxidation activity than Pd/C and Pt/C. This study may pave the way for using MOF-supported multi-metallic nanoparticles for CO oxidation electrocatalysis.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.langmuir.2c01841.

    • Raman spectra, FTIR spectra, and TGA analysis of Pd/ZIF-67/C, ZIF-67/C, Pd/C, and Pt/C; ICP-OES analysis of Pd/ZIF-67/C; CO oxidation durability in 0.1 M KOH, 0.1 M HClO4, and 0.1 M NaHCO3 electrolytes, Voigt electrical equivalent circuit and EIS data for CO oxidation in 0.1 M KOH and 0.1 M NaHCO3 electrolytes; TEM image of Pd/ZIF-67/C after stability tests; and comparison table for the CO oxidation of Pd/ZIF-67/C with other previously published articles (PDF)

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    Langmuir

    Cite this: Langmuir 2022, 38, 36, 11109–11120
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.langmuir.2c01841
    Published August 30, 2022
    Copyright © 2022 American Chemical Society

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