Chinese Journal of Catalysis ›› 2023, Vol. 48: 137-149.DOI: 10.1016/S1872-2067(23)64422-5
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Fangpei Maa, Qingping Tanga, Shibo Xib, Guoqing Lia, Tao Chena, Xingchen Linga, Yinong Lyuc, Yunpeng Liud, Xiaolong Zhaoa, Yu Zhoua,*(), Jun Wanga,*()
Received:
2022-11-24
Accepted:
2023-03-06
Online:
2023-05-18
Published:
2023-04-20
Contact:
* E-mail: Supported by:
Fangpei Ma, Qingping Tang, Shibo Xi, Guoqing Li, Tao Chen, Xingchen Ling, Yinong Lyu, Yunpeng Liu, Xiaolong Zhao, Yu Zhou, Jun Wang. Benzimidazole-based covalent organic framework embedding single-atom Pt sites for visible-light-driven photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, 2023, 48: 137-149.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64422-5
Fig. 1. (a) Schematic illustration of the molecular structure for PABZ-Tp with the synthetic procedure. (b) Lattice structure at the top and side view (yellow: carbon; white: hydrogen; blue: nitrogen; red: oxygen; red: sulfur). (c) Experimentally observed (red) and Pawley refined (black) PXRD patterns with their refinement difference (gray), the reflections and the simulated one (blue) for ideal AA-stacking mode. (d) Solid-state 13C CP-MAS NMR spectrum of PABZ-Tp. (e) N2 sorption isotherms and the corresponding pore size distribution profiles of PABZ-Tp; HR-TEM (f) and Fourier transform (FFT) (g) images. HAADF-STEM (h) and the corresponding elemental mapping (i-k) images for C, N, and O atoms. Scale bars: f: 5 nm; g: 1 nm; h-k: 100 nm.
Fig. 2. UV-vis diffuse reflection absorption spectra (a), energy band gap (b) determined from the Kubelka-Munk-transformed reflectance spectra, transient photocurrent responses (c), electrochemical impedance spectra (d), steady-state Photoluminescence spectra (e), and time-resolved fluorescence decay spectra (f) of PABZ-Tp, PABZ-Tp-A, and Tp-BD.
Fig. 3. (a) Time-resolved HER activity of PABZ-Tp, PABZ-Tp-A, and Tp-BD. (b) TOF comparisons of PABZ-Tp (red pentastar) and other representative photocatalysts (entries 1-21 in Table S14; the circle is COF-based photocatalyst, the square is TiO2-based photocatalyst, the pentagon is MOF-based photocatalyst, and the diamond is amorphous polymer photocatalyst). (c) Cycling HER behavior of PABZ-Tp. (d) Wavelength-dependent AQE of PABZ-Tp. (e) The photocatalytic H2 evolution rate of PABZ-Tp, PABZ-Tp-A, and Tp-BD in the absence of Pt additive. (f) HR-TEM, AC HAADF-STEM images of Pt/PABZ-Tp, and corresponding electron lattice diffraction diagram; Pt L3-edge X-ray absorption near-edge structure (g) and corresponding k3-weighted Fourier transform spectra (h) at R space of Pt/PABZ-Tp, PtO2, and Pt foil.
Fig. 4. (a) TPV curves of PABZ-Tp and Tp-BD. (b) The radical anion pathway (solid arrow) and radical cationic pathway (dotted arrows) after photoexcitation of PABZ-Tp and Tp-BD, with the difference of the adiabatic stabilization energy of the radical cation and anion state relative to the neutral state for the optimized representative fragment of PABZ-Tp and Tp-BD. Charge distribution and dipole moment of the radical anion state for the optimized representative fragment of PABZ-Tp (c) and Tp-BD (d). C gray, H white, O red, N blue.
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