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Creating Polycrystalline Cu Catalysts via Capping Agents and Electrochemical Treatment for CO2 Reduction to C2H4

  • Heng Zhang
    Heng Zhang
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    More by Heng Zhang
  • Min Sun
    Min Sun
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    More by Min Sun
  • Yuansong Zhao
    Yuansong Zhao
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
  • Lei Xue
    Lei Xue
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    More by Lei Xue
  • Yanxin Wu
    Yanxin Wu
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    More by Yanxin Wu
  • Yang Liu
    Yang Liu
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    More by Yang Liu
  • , and 
  • Shanghong Zeng*
    Shanghong Zeng
    Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot010021, China
    *Email: [email protected]
Cite this: Energy Fuels 2023, 37, 1, 529–538
Publication Date (Web):December 20, 2022
https://doi.org/10.1021/acs.energyfuels.2c03497
Copyright © 2022 American Chemical Society

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    Abstract

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    Carbon–carbon coupling is desirable for the electrochemical reduction of carbon dioxide (CO2RR) into high-energy-density C2+ products, but it still remains a challenge owing to product diversity. Here, polycrystalline Cu catalysts were constructed through capping agents and electrochemical treatment. The capping agents assist in the effective synthesis of the sharp-tip flower CuO pre-catalysts with rough surfaces and abundant grain boundaries. After electrochemical treatment, the in situ-generated polycrystalline Cu catalyst exhibits 34% Faradaic efficiency for the C2H4 product at −1.5 V versus reversible hydrogen electrode. With a quasi-in situ total reflection Fourier-transform infrared spectroscopic study, we captured a critical *COOH intermediate on the polycrystalline Cu surfaces, providing direct evidence to support the hypothesis that CO2 initially undergoes the activation process to generate *COOH. Our work offers insights into the rational design of selective Cu catalysts for C2+ products in CO2RR.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.energyfuels.2c03497.

    • Catalyst preparation; FESEM images, TEM images, and Raman spectra of CuO precatalysts; XRD patterns of the CuO precatalyst and Cu–F3 catalyst; LSV curve and gas product FE of CuO catalysts; FTIR spectrum of the Cu–F3 catalyst; NMR spectra of liquid-phase products of the Cu–F3 catalyst; ECSA, FE, and CV curves of catalysts; stability test of the Cu–F3 catalyst; post-CO2RR SEM image of the Cu–F3 catalyst, and comparison of performances of the Cu–F3 catalyst and the reported catalysts for CO2RR (PDF)

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    Cited By

    This article is cited by 1 publications.

    1. Aso Navaee, Abdollah Salimi. Review on CO2 Management: From CO2 Sources, Capture, and Conversion to Future Perspectives of Gas-Phase Electrochemical Conversion and Utilization. Energy & Fuels 2024, 38 (4) , 2708-2742. https://doi.org/10.1021/acs.energyfuels.3c04269

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