Chinese Journal of Catalysis ›› 2025, Vol. 74: 144-154.DOI: 10.1016/S1872-2067(25)64717-6
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Lin Zhanga,1, Hui Zhanga,1, Jinghong Fangb, Jialin Cuia, Jie Liuc, Hui Liua,*(), Lishui Suna, Qiong Sunb,*(
), Lifeng Dongb,*(
), Yingjie Zhaoa,*(
)
Received:
2024-12-25
Accepted:
2025-03-14
Online:
2025-07-18
Published:
2025-07-20
Contact:
*E-mail: About author:
1Contributed equally to this work.
Supported by:
Lin Zhang, Hui Zhang, Jinghong Fang, Jialin Cui, Jie Liu, Hui Liu, Lishui Sun, Qiong Sun, Lifeng Dong, Yingjie Zhao. Highly conjugated and chemically stable three-dimensional covalent organic frameworks for efficient photocatalytic CO2 reduction[J]. Chinese Journal of Catalysis, 2025, 74: 144-154.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(25)64717-6
Fig. 1. (a) The synthesis of 3D-COF-1 and 3D-COF-2. (b) FT-IR spectra of 3D-COF-1, 3D-COF-2, compound A, and compound B and the enlarged portion within the green dashed box of the left image.
Fig. 2. Simulated and experimental powder X-ray diffraction patterns and difference curves of 3D-COF-1 (a) and 3D-COF-2 (b). N2 adsorption?desorption isotherms and pore size distribution profiles of 3D-COF-1 (c) and 3D-COF-2 (d).
Fig. 4. (a) CO2 adsorption-desorption isotherms at 25 and 0 °C of 3D-COF-1 and 3D-COF-2. (b) Photocatalytic CO yields of 3D-COF-1 and 3D-COF-2. (c) Recycling stability tests of 3D-COF-2.
Fig. 5. (a) Solid-state UV/vis absorption spectra of 3D-COF-1 and 3D-COF-2. (b) Band gaps of 3D-COF-1 and 3D-COF-2. (c) Mott-Schottky plot of 3D-COF-1. (d) Mott-Schottky plot of 3D-COF-2. (e) The band structure diagram of 3D-COF-1 and 3D-COF-2. (f) Transient photocurrent response of 3D-COF-1 and 3D-COF-2. (g) Electrochemical impedance spectroscopy of 3D-COF-1 and 3D-COF-2. (h) EPR spectra of 3D-COF-1 in the dark and under the light. (i) EPR spectra of 3D-COF-2 in the dark and under the light.
Fig. 6. (a) In situ DRIFTS of 3D-COF-2 in the dark (background) and under visible light irradiation for different durations. (b) In situ DRIFTS of 3D-COF-2 for *CO adsorption. (c) In situ DRIFTS of 3D-COF-2 for CO2 adsorption. (d) The possible reaction mechanism for photocatalytic CO2-to-CO reduction on the 3D-COF-2-based metal-free catalyst, along with the corresponding Gibbs free energy change (ΔG) values for each step. (e) Gibbs free energy plots for 3D-COF-2 in the process of CO2 reduction. Calculated ESP on the van der Waals surface of 3D-COF-1 (f) and 3D-COF-2 (g), with blue indicating more negative ESPs and red indicating more positive ESPs. The simulated structures and adsorption energies of CO2 adsorbed in 3D-COF-1 (h) and 3D-COF-2 (i).
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