Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (2): 303-315.DOI: 10.1016/S1872-2067(21)63818-4
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Zhiliang Jin*(), Hongying Li#(), Junke Li
Received:
2021-01-31
Accepted:
2021-03-28
Online:
2022-02-18
Published:
2021-05-20
Contact:
Zhiliang Jin, Hongying Li
Supported by:
Zhiliang Jin, Hongying Li, Junke Li. Efficient photocatalytic hydrogen evolution over graphdiyne boosted with a cobalt sulfide formed S-scheme heterojunction[J]. Chinese Journal of Catalysis, 2022, 43(2): 303-315.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63818-4
Fig. 5. SEM images of GDY (a), GDY-CuI (b), and GDY-CC (c); (d) TEM images of GDY-CC; (e) HRTEM images of GDY-CC; (f) EDX analysis of GDY-CC; (g) Elemental mapping images of GDY-CC.
Fig. 6. (a) XPS spectra survey scans of GDY, CuI, Co9S8, GDY-CuI, and GDY-CC; Narrow scans for C (b), Cu 2p (c), and I 3d (d) in GDY, CuI, and GDY-CC; Narrow scans for Co 2p (e) and S 2p (f) in Co9S8 (top) and GDY-Co9S8 (bottom), and Co 2p (g) and S 2p (h) in Co9S8 (top) and GDY-CC (bottom).
Fig. 7. Raman spectra of GDY (a) and GDY-CuI and GDY-CC (b); (c) H2 evolution activity of GDY, CuI, GDY-CuI, Co9S8, GDY-Co9S8, and GDY-CC; (d) Stability test of GDY-CC.
Fig. 9. (a) PL spectra of EY, CuI, Co9S8, GDY, GDY-Co9S8, GDY-CuI, and GDY-CC; (b) Time-resolved photoluminescence (TRPL) of EY, CuI, Co9S8, GDY, GDY-Co9S8, GDY-CuI, and GDY-CC.
Samples | Rel (%) | Average lifetime <τav> (ns) | X2 |
---|---|---|---|
EY | A=100 | 0.19 | 1.01 |
CuI | 0.18 | 0.98 | |
Co9S8 | 0.20 | 1.14 | |
GDY | 0.19 | 1.13 | |
GDY-Co9S8 | 0.18 | 1.10 | |
GDY-CuI | 0.20 | 1.36 | |
GDY-CC | 0.27 | 1.21 |
Table 1 inetic analysis of the EY, CuI, Co9S8, GDY, GDY-Co9S8, GDY-CuI, and GDY-CC emission decay.
Samples | Rel (%) | Average lifetime <τav> (ns) | X2 |
---|---|---|---|
EY | A=100 | 0.19 | 1.01 |
CuI | 0.18 | 0.98 | |
Co9S8 | 0.20 | 1.14 | |
GDY | 0.19 | 1.13 | |
GDY-Co9S8 | 0.18 | 1.10 | |
GDY-CuI | 0.20 | 1.36 | |
GDY-CC | 0.27 | 1.21 |
Fig. 10. (a) The transient photocurrent response curves of GDY, Co9S8, GDY-Co9S8, GDY-CuI, and GY-CC; (b) The EIS of the GDY, Co9S8, GDY-Co9S8, GDY-CuI, and GY-CC electrodes. (c) LSV curves of GDY, Co9S8, GDY-Co9S8, GDY-CuI, and GY-CC; Mott-Schottky plots for GDY (d), Co9S8 (e), and CuI (f).
Sample | Band energy Eg (eV) | Valence band EVB (eV) | Conduction band ECB (eV) |
---|---|---|---|
GDY | 1.72 | 1.39 | -0.33 |
Co9S8 | 1.51 | 0.60 | -0.91 |
CuI | 2.78 | 2.96 | 0.18 |
Table 2 Band gap energies, valence band, and conduction band edge potentials of GDY, Co9S8, and CuI.
Sample | Band energy Eg (eV) | Valence band EVB (eV) | Conduction band ECB (eV) |
---|---|---|---|
GDY | 1.72 | 1.39 | -0.33 |
Co9S8 | 1.51 | 0.60 | -0.91 |
CuI | 2.78 | 2.96 | 0.18 |
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