Chinese Journal of Catalysis ›› 2024, Vol. 59: 324-333.DOI: 10.1016/S1872-2067(23)64632-7
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Chaochen Wanga,b, Wangxin Gea, Lei Tangb, Yanbin Qia, Lei Dongb, Hongliang Jiangb, Jianhua Shena,*(), Yihua Zhua,*(), Chunzhong Lia,b,*()
Received:
2024-01-19
Accepted:
2024-02-18
Online:
2024-04-18
Published:
2024-04-15
Contact:
*E-mail: Supported by:
Chaochen Wang, Wangxin Ge, Lei Tang, Yanbin Qi, Lei Dong, Hongliang Jiang, Jianhua Shen, Yihua Zhu, Chunzhong Li. Highly selective CO2-to-CO electroreduction on multisite coordinated single-atom-modified atomic cluster Cu-based catalyst[J]. Chinese Journal of Catalysis, 2024, 59: 324-333.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64632-7
Fig. 1. (a) Schematic diagram of the preparation process of Cu SA/ACs. (b) SEM images of Cu SA/ACs. (c) Aberration-corrected HRTEM of Cu SA/SCs. (d-g) Atomic-resolution EDS mapping images of various elements. (h) Cu K edge XANES spectra of Cu foil, CuO, CuPc (copper(II) phthalocyanine), Cu2O, and Cu SA/ACs. (i) Fourier transforms (FT) of k3-weighted Cu K edge EXAFS experimental data for Cu foil, CuO, CuPc, Cu2O, and Cu SA/ACs. (j) Wavelet transform (WT) plot of Cu SA/ACs.
Fig. 2. (a) LSV curves acquired in CO2-saturated (red line) or Ar-saturated (grey line) 0.5 mol L-1 KHCO3 electrolyte. (b) Faraday efficiency of products obtained using Cu SA/ACs in CO2-saturated 0.5 mol L-1 KHCO3 electrolyte. (c) Faraday efficiency of CO obtained using Cu SA/ACs, Cu SACs, NC, and Cu NPs in CO2-saturated 0.5 mol L-1 KHCO3 electrolyte. (d) Partial current densities of CO obtained using Cu SA/ACs, Cu SACs, NC, and Cu NPs in CO2-saturated 0.5 mol L-1 KHCO3 electrolyte. (e) TOF of Cu SA/ACs, Cu SACs and Cu NPs. (f) Summary of the electrocatalytic performances Cu SACs and Cu clusters reported in the literature. Related references are given in the Supporting Information. (g) Long-term Cu SA/ACs stability in electrocatalytic CO2 reduction at -0.4 V versus RHE.
Fig. 3. (a) CO and H2 Faradaic efficiencies of the Cu SA/ACs catalyst in the current density range of 100 to 800 mA cm-2 in the flow cell. (b) Long-term electrolysis under a current density of 200 mA cm-2 in the flow cell. (c) Cathodic energy efficiency of the Cu SA/ACs catalyst in the flow cell (voltages are not iR-corrected) (d) In-situ ATR-SEIRAS spectra of Cu SA/ACs in the range 1200-2150 cm-1 at different potentials. (e) In-situ ATR-SEIRAS spectra of Cu SACs in the range of 1200-2150 cm-1 at varying potentials. (f) Schematic diagram of the improved effect of electric field enhancement on the Cu SA/ACs and Cu SACs catalysts.
Fig. 4. Differential charge density analysis of Cu ACs (a), Cu SA/ACs (b), and Cu SACs (c). (d) PDOS of Cu SA/ACs, Cu SACs and Cu ACs. (e) Gibbs free energy diagrams for the CO2RR on the Cu SA/ACs. (f) Comparison of Gibbs free energy changes during the CO2RR on Cu SA/ACs, Cu SACs, and Cu NPs.
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