Chinese Journal of Catalysis ›› 2024, Vol. 58: 180-193.DOI: 10.1016/S1872-2067(23)64609-1
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Jinkang Pana,b,1, Aicaijun Zhanga,b,1, Lihua Zhanga,c, Pengyu Donga,*()
Received:
2023-11-30
Accepted:
2024-01-21
Online:
2024-03-18
Published:
2024-03-28
Contact:
*E-mail: dongpy11@gmail.com (P. Dong).
About author:
1Contributed equally to this work.
Supported by:
Jinkang Pan, Aicaijun Zhang, Lihua Zhang, Pengyu Dong. Construction of S-scheme heterojunction from protonated D-A typed polymer and MoS2 for efficient photocatalytic H2 production[J]. Chinese Journal of Catalysis, 2024, 58: 180-193.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64609-1
Fig. 2. High-resolution C 1s XPS spectra (a) and O 1s XPS spectra (b) of PPMS-0.5%, PyDTDO-3 (AA), and PyDTDO-3. (c) High-resolution S 2p XPS spectra of PPMS-0.5%, PyDTDO-3 (AA), PyDTDO-3 and MoS2. (d) High-resolution Mo 3d XPS spectra of PPMS-0.5% and MoS2.
Fig. 3. SEM images of PyDTDO-3 (a), MoS2 (b), and PPMS-0.5% (c). TEM images of PyDTDO-3 (d), PPMS-0.5% (e). (f) HRTEM image of PPMS-0.5%. (g) EDS mapping images of PPMS-0.5%.
Fig. 4. (a) Production of H2 over prepared samples in the presence of visible light (λ ≥ 420 nm). (b) Bar graph of all as-synthesized samples' photocatalytic H2 production with error bars. (c) Cycling run tests of PPMS-0.5% and PyDTDO-3. XRD patterns (d) and FTIR spectra (e) of PPMS-0.5% before and after photocatalysis. (f) AQE of PPMS-0.5% at 420, 450, 500, 550, and 600 nm.
Fig. 5. (a) Each prepared sample's UV-Vis DRS spectrum. (b) Tauc graphs of individual components. (c) Photocurrent graphs for MoS2, PyDTDO-3, and PPMS-0.5%. (d) Nyquist plots from EIS (the corresponding circuit is displayed in the inset). Mott-Schottky plots (e) and VB and CB band positions (f) for MoS2 and HOMO and LUMO band positions for PyDTDO-3.
Fig. 6. The Z-axis electrostatic potential of the following surfaces: MoS2 (002) (a) and PyDTDO-3 (001) (b) (the matching optimized slab structures are displayed in the insets). The PyDTDO-3 (001)/MoS2 (002) heterojunction interface building for simulation (c, d) following geometry optimization from the top side and cross perspectives. (e,f) The computed charge density differences in the PyDTDO-3 (001)/MoS2 (002) heterojunction were estimated from the top views. Charge accumulation is represented by the yellow zone and charge depletion by the cyan region.
Fig. 7. The constructed structural models of H adsorbed on the MoS2 (a), PyDTDO-3 (b), and PPMS (c). (d) The calculated Gibbs free energy of H adsorbed on the MoS2, PyDTDO-3, and PPMS-0.5%.
Scheme 2. (a) Schematic explanation of the charge migration mechanism in PPMS heterostructure before and after contact in darkness, and irradiated with visible light. (b) Proposed active sites for photocatalytic H2 evolution over PPMS heterostructure.
Fig. 8. Pseudocolor graphs and transient absorption spectra acquired at specified delay durations using 340 nm excitation: pure PyDTDO-3 (a,c) and PPMS-0.5% heterojunction (b,d). (e) Corresponding curves of kinetic decay of pure PyDTDO-3 and PPMS-0.5% heterojunction at 675 nm within 1000 ps. (f) Diagrammatic representation of charge transfer in the S-scheme PPMS heterojunction.
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