Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (3): 679-707.DOI: 10.1016/S1872-2067(21)63863-9
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Xuli Lia,b, Ning Lia,b, Yangqin Gaoa,b, Lei Gea,b,*()
Received:
2021-04-20
Revised:
2021-04-20
Online:
2022-03-18
Published:
2022-02-18
Contact:
Lei Ge
Supported by:
Xuli Li, Ning Li, Yangqin Gao, Lei Ge. Design and applications of hollow-structured nanomaterials for photocatalytic H2 evolution and CO2 reduction[J]. Chinese Journal of Catalysis, 2022, 43(3): 679-707.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63863-9
Fig. 2. (a) Illustration of procedures for preparing inorganic and hybrid hollow spheres. (b) The scheme shown for PS latex particles. Reprinted with permission from Ref. [98]. Copyright 1998, American Association for the Advancement of Science.
Fig. 3. SEM (a) and TEM (b) images of solid PB mesocrystals (average particle size: 110 nm) as the starting material. SEM (c) and TEM (d) images of the hollow PB mesocrystals (average particle size: 110 nm) synthesized by chemical etching. Inset images on the SEM and TEM images are (a,c) enlarged SEM images of one particle and (b,d) the corresponding selected-area electron diffraction (SAED) patterns of one particle. Reprinted with permission from Ref. [110]. Copyright 2012, Wiley-VCH GmbH.
Fig. 4. Schematic illustration of the formation process of NiCo2S4 ball-in-ball hollow spheres. Stage I, surface NiCo2S4 formed by anion exchange method. Stage II, further diffusion of S2- and formation of NiCo2S4 on the inner NiCo-glycerate core. Stage III, completion of the anion exchange reaction. M2+ refers to metal cations, including Ni2+ and Co2+ ions. Reprinted with permission from Ref. [113]. Copyright 2015, Springer Nature.
Fig. 5. TEM images of core-shell ZIF-8@ZIF-67 NPs annealed at 500 °C (a,e), 550 °C (b,f), 600 °C (c,g), and 800 °C (d,h). (i) Schematic of the formation process of NC@Co-NGC DSNCs. Reprinted with permission from Ref. [115]. Copyright 2017, Wiley-VCH GmbH.
Hollow photocatalyst | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY | Year /Ref. | ||
---|---|---|---|---|---|---|---|
Hollow CdS | ![]() ![]() | H2 evolution | 3.14 | — | 2019 [ | ||
CdS frame- in-cage particles | ![]() | H2 evolution | 11.3 | 3.2% | 2020 [ | ||
Double- shelled CdS | ![]() ![]() | H2 evolution | 250.1 | — | 2020 [ | ||
Hollow CdS/Ni-Mo-S | ![]() ![]() | H2 evolution | 838.17 | — | 2019 [ | ||
Hollow CdS/Co9S8 | ![]() ![]() | H2 evolution | 1061.3 | — | 2017 [ | ||
Hollow photocatalyst | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY | Year /Ref. | ||
Hollow CdS@g-C3N4 | ![]() ![]() | H2 evolution | 4.39 | 3.22% 420 nm | 2018 [ | ||
CdS@ZnIn2S4 hollow cubes | ![]() ![]() | H2 evolution | 540.3 | 1.53% 400 nm | 2021 [ | ||
Pd@CdS/PdS | ![]() ![]() | H2 evolution | 144.8 | — | 2018 [ | ||
MnOx@CdS/ CoP | ![]() ![]() | H2 evolution | 238.4 µmol h-1 (10 mg) | — | 2017 [ | ||
Au@HCS@ PdS | ![]() ![]() | H2 evolution | 16.35 | 41% 420 nm | 2020 [ | ||
Pt/TiO2/CdS/ Co3O4 | ![]() ![]() | H2 evolution | 2000 | — | 2017 [ | ||
NG/CdS | ![]() ![]() | CO2 reduction | CO (2.59) CH4 (0.33) | 0.9% 420 nm | 2019 [ |
Table 1 The applications of CdS-based hollow structures in photocatalytic reactions.
Hollow photocatalyst | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY | Year /Ref. | ||
---|---|---|---|---|---|---|---|
Hollow CdS | ![]() ![]() | H2 evolution | 3.14 | — | 2019 [ | ||
CdS frame- in-cage particles | ![]() | H2 evolution | 11.3 | 3.2% | 2020 [ | ||
Double- shelled CdS | ![]() ![]() | H2 evolution | 250.1 | — | 2020 [ | ||
Hollow CdS/Ni-Mo-S | ![]() ![]() | H2 evolution | 838.17 | — | 2019 [ | ||
Hollow CdS/Co9S8 | ![]() ![]() | H2 evolution | 1061.3 | — | 2017 [ | ||
Hollow photocatalyst | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY | Year /Ref. | ||
Hollow CdS@g-C3N4 | ![]() ![]() | H2 evolution | 4.39 | 3.22% 420 nm | 2018 [ | ||
CdS@ZnIn2S4 hollow cubes | ![]() ![]() | H2 evolution | 540.3 | 1.53% 400 nm | 2021 [ | ||
Pd@CdS/PdS | ![]() ![]() | H2 evolution | 144.8 | — | 2018 [ | ||
MnOx@CdS/ CoP | ![]() ![]() | H2 evolution | 238.4 µmol h-1 (10 mg) | — | 2017 [ | ||
Au@HCS@ PdS | ![]() ![]() | H2 evolution | 16.35 | 41% 420 nm | 2020 [ | ||
Pt/TiO2/CdS/ Co3O4 | ![]() ![]() | H2 evolution | 2000 | — | 2017 [ | ||
NG/CdS | ![]() ![]() | CO2 reduction | CO (2.59) CH4 (0.33) | 0.9% 420 nm | 2019 [ |
Fig. 7. TEM images of the obtained products after reactions for 0.5, 2, and 4 h, and the corresponding schematic illustration of the formation process of CdS-H. Reprinted with permission from Ref. [135]. Copyright 2019, Royal Society of Chemistry.
Fig. 8. (a) Schematic illustration of the two-step sulfidation approach for the fabrication of CdS frame-in-cage particles. (b) TEM images of Cd-PBA cubes. (c,d) Cd-PBA cube-in-CdS cage particles. (e) CdS frame-in-cage particles. Reprinted with permission from Ref. [136]. Copyright 2020, Wiley-VCH GmbH.
Fig. 9. TEM (a) and HAADF-STEM and EDX mapping images (b) of Zn0.6Cd0.4S NPs. (c) Schematic illustration of the synthesis process of hollow ZnCdS cages. Reprinted with permission from Ref. [137]. Copyright 2017, Royal Society of Chemistry.
Fig. 10. (a) TEM images of AA-[Zn(OH)4]2- composite nanospheres. (b) TEM images of ZnS composite nanospheres. (c) TEM images of DS-Zn0.46Cd0.54S hollow nanospheres. (d) Schematic illustration of the synthetic strategy of ZnxCd1-xS double-shell hollow nanospheres. Reprinted with permission from Ref. [148]. Copyright 2018, Elsevier B.V.
Hollow structure | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
ZnxCd1-xS double-shell hollow nanospheres | ![]() ![]() | H2 evolution | 4110 | — | 2018 [ |
Hollow ZnCdS | ![]() ![]() | H2 evolution | 5.68 | — | 2017 [ |
Co9S8/ZCS | ![]() ![]() | H2 evolution | 10.9 | 8.96 420 nm | 2020 [ |
Co9S8/ZCS | ![]() ![]() | H2 evolution | 9.039 | 4.49 420 nm | 2020 [ |
Co9S8@ZnIn2S4 | ![]() ![]() | H2 evolution | 6.250 | — | 2018 [ |
Co/NGC@ ZnIn2S4 | ![]() ![]() | H2 evolution | 11.270 | 5.07 420 nm | 2019 [ |
MoSe2/CdSe | ![]() | H2 evolution O2 evolution | 7.120 0.348 | 27.2 670 nm | 2019 [ |
Table 2 The applications of ZnxCd1-xS or ZnIn2S4-based hollow structures in photocatalytic reactions.
Hollow structure | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
ZnxCd1-xS double-shell hollow nanospheres | ![]() ![]() | H2 evolution | 4110 | — | 2018 [ |
Hollow ZnCdS | ![]() ![]() | H2 evolution | 5.68 | — | 2017 [ |
Co9S8/ZCS | ![]() ![]() | H2 evolution | 10.9 | 8.96 420 nm | 2020 [ |
Co9S8/ZCS | ![]() ![]() | H2 evolution | 9.039 | 4.49 420 nm | 2020 [ |
Co9S8@ZnIn2S4 | ![]() ![]() | H2 evolution | 6.250 | — | 2018 [ |
Co/NGC@ ZnIn2S4 | ![]() ![]() | H2 evolution | 11.270 | 5.07 420 nm | 2019 [ |
MoSe2/CdSe | ![]() | H2 evolution O2 evolution | 7.120 0.348 | 27.2 670 nm | 2019 [ |
Hollow structure | Morphology | Photocatalytic reaction | Performance | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
Co3O4/ HCNS/Pt | | H2 evolution O2 evolution | 0.3 µmol h-1 0.1 µmol h-1 (20 mg) | — | 2016 [ |
PtNi/g-C3N4 | ![]() ![]() | H2 evolution | 98.6 µmol h-1 (50 mg) | 5.89 420 nm | 2018 [ |
CoSx/g-C3N4 | ![]() ![]() | H2 evolution | 629 µmol h-1 g-1 | — | 2018 [ |
CoNiSx-CN | ![]() ![]() | H2 evolution | 2366 μmol h-1 g-1 | 4.3 420 nm | 2019 [ |
g-C3N4@HG | ![]() | H2 evolution | 1.43 mmol h-1 g-1 | 3.56 420 nm | 2020 [ |
Table 3 The applications of g-C3N4-based hollow structures in photocatalytic reactions.
Hollow structure | Morphology | Photocatalytic reaction | Performance | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
Co3O4/ HCNS/Pt | | H2 evolution O2 evolution | 0.3 µmol h-1 0.1 µmol h-1 (20 mg) | — | 2016 [ |
PtNi/g-C3N4 | ![]() ![]() | H2 evolution | 98.6 µmol h-1 (50 mg) | 5.89 420 nm | 2018 [ |
CoSx/g-C3N4 | ![]() ![]() | H2 evolution | 629 µmol h-1 g-1 | — | 2018 [ |
CoNiSx-CN | ![]() ![]() | H2 evolution | 2366 μmol h-1 g-1 | 4.3 420 nm | 2019 [ |
g-C3N4@HG | ![]() | H2 evolution | 1.43 mmol h-1 g-1 | 3.56 420 nm | 2020 [ |
Fig. 11. (a,b) SEM images of the tubular g-C3N4 at different magnifications. (c) TEM image of tubular g-C3N4. (d) TEM image of single tube of tubular g-C3N4 (the inset is SAED pattern of tubular g-C3N4). From Ref. [161]. (e) Schematic illustration of the formation of the carbon nitride nanotubes. Reprinted with permission from Ref. [160]. Copyright 2013 and 2012, Royal Society of Chemistry.
Hollow structure | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
Co1.62Mo6S8/THS | ![]() ![]() | H2 evolution | 44.43 | 4.88 365 nm | 2020 [ |
TiO2/NiO | ![]() ![]() | H2 evolution dye degradation | 393 µmol h-1 g-1 88% within 100 min | — | 2015 [ |
NiO/TiO2/C | ![]() ![]() | H2 evolution dye degradation | 356 µmol h-1 g-1 RhB (94%) within 75 min MB (98%) within 100 min | — | 2016 [ |
RuO2@TiO2@Pt | ![]() ![]() | H2 production Pollutant degradation | 809 µmol h-1 g-1 RhB (98%); MO (80%) phenol (40%) | — | 2016 [ |
Ag-I-RuO2-O-THS | ![]() ![]() | H2 evolution | 300.2 µmol (5 h, 80 mg) | — | 2017 [ |
Pt@TiO2@ MnOx | ![]() ![]() | O2 evolution | 31.22 mmol (14 h, 30 mg) | 63.14 254 nm | 2016 [ |
Aux@THS@CoO | ![]() ![]() | CO2 reduction | CH4 (13.3) | — | 2019 [ |
Table 4 The applications of TiO2-based hollow structures in photocatalytic reactions.
Hollow structure | Morphology | Photocatalytic reaction | Performance (mmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
Co1.62Mo6S8/THS | ![]() ![]() | H2 evolution | 44.43 | 4.88 365 nm | 2020 [ |
TiO2/NiO | ![]() ![]() | H2 evolution dye degradation | 393 µmol h-1 g-1 88% within 100 min | — | 2015 [ |
NiO/TiO2/C | ![]() ![]() | H2 evolution dye degradation | 356 µmol h-1 g-1 RhB (94%) within 75 min MB (98%) within 100 min | — | 2016 [ |
RuO2@TiO2@Pt | ![]() ![]() | H2 production Pollutant degradation | 809 µmol h-1 g-1 RhB (98%); MO (80%) phenol (40%) | — | 2016 [ |
Ag-I-RuO2-O-THS | ![]() ![]() | H2 evolution | 300.2 µmol (5 h, 80 mg) | — | 2017 [ |
Pt@TiO2@ MnOx | ![]() ![]() | O2 evolution | 31.22 mmol (14 h, 30 mg) | 63.14 254 nm | 2016 [ |
Aux@THS@CoO | ![]() ![]() | CO2 reduction | CH4 (13.3) | — | 2019 [ |
Fig. 12. Representative TEM images of particles obtained after processing times of 1 h (a), 2 h (b), 3 h (c), 4 h (d), 5 h (e), and 7 h (f). (g) Schematic of the particle formation and development of the hollow structure in the solvothermal process. The chemical conversion caused nonuniform development of tiny grains and empty spaces within the spheres, which enhanced the outward migration and relocation of the core grains toward the outer layer, resulting in the generation and development of a hollow structure. Reprinted with permission from Ref. [174]. Copyright 2016, Elsevier B.V.
Fig. 13. TEM images showing the morphological evolution of sSiO2@TiO2 samples after hydrothermal treatment at 140 °C for 0 h (a), 1 h (b), 2 h (c), 5 h (d), 10 h (e), and 24 h (f,g). (h) SEM image of DHS-Ti. (i) SEM image showing a broken double-shelled structure. (j) Schematic illustration of the formation process of double-shelled TiO2 hollow spheres. Reprinted with permission from Ref. [175]. Copyright 2017, Wiley-VCH GmbH.
Hollow structures | Morphology | Photocatalytic reaction | Performance (µmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
CeO2/ZnIn2S4 | ![]() | Benzaldehyde evolution H2 evolution | 664.1 1496.6 | — | 2020 [ |
CeO2-xSx@CdS | ![]() ![]() | H2 evolution | 1147.2 | — | 2019 [ |
g-C3N4@CeO2 | ![]() ![]() | CO2 reduction | CH4 (3.5 µmol g-1, 4 h) CH3OH (5.2 µmol g-1, 4 h) CO (16.8 µmol g-1, 4 h) | 17.1 525 nm | 2019 [ |
ZnO1-x/C | ![]() ![]() | CO2 reduction | CO (µmol h-1 g-1, 4 h) | 0.13 | 2018 [ |
Table 5 The applications of CeO2-based or other hollow structures in photocatalytic reactions.
Hollow structures | Morphology | Photocatalytic reaction | Performance (µmol h-1 g-1) | AQY (%) | Year /Ref. |
---|---|---|---|---|---|
CeO2/ZnIn2S4 | ![]() | Benzaldehyde evolution H2 evolution | 664.1 1496.6 | — | 2020 [ |
CeO2-xSx@CdS | ![]() ![]() | H2 evolution | 1147.2 | — | 2019 [ |
g-C3N4@CeO2 | ![]() ![]() | CO2 reduction | CH4 (3.5 µmol g-1, 4 h) CH3OH (5.2 µmol g-1, 4 h) CO (16.8 µmol g-1, 4 h) | 17.1 525 nm | 2019 [ |
ZnO1-x/C | ![]() ![]() | CO2 reduction | CO (µmol h-1 g-1, 4 h) | 0.13 | 2018 [ |
Fig. 14. HRTEM and SAED images of CeO2 hollow structures: (a1,b1) polyhedron. (a2,b2) cube. (a3,b3) sphere. (c) Schematic illustration of the formation of CeO2 hollow structures by template-engaged coordinating etching of Cu2O nanocubes. Reprinted with permission from Ref. [183]. Copyright 2015, Elsevier B.V.
Fig. 15. (a) Schematic illustration of the synthetic process of hierarchical Co9S8@ZnIn2S4 heterostructured cage: (I) sulfidation reaction and thermal treatment in argon atmosphere and (II) growth of ZnIn2S4 nanosheets (NSs). (b) TEM images of Co9S8@ZnIn2S4 cages, (c) Photocatalytic H2 evolution performance of different samples. (d) EIS spectra of Co9S8@ZnIn2S4. Reprinted with permission from Ref. [200]. Copyright 2018, American Chemical Society.
Fig. 16. TEM images of CoSx (a), Co9S8 (b), and 10Co9S8/ZCS (c). (d) Photocatalytic H2 activity of different samples under visible-light irradiation. ESR spectra of h+ (e) and e- (f) signal of Zn0.5Cd0.5S and 10Co9S8/ZCS photocatalysts at different irradiation times at room temperature. (g) Work functions of Zn0.5Cd0.5S and Co9S8 samples. (h) Proposed mechanism of photocatalytic hydrogen process over Co9S8/ZCS composite. Reprinted with permission from Ref. [201]. Copyright 2020, Elsevier B.V.
Fig. 17. SEM (a) and TEM (b,c) images of the prepared 10%-Co9S8/ZnIn2S4 composite. (d) Schematic illustration of the fabrication process of hierarchical Co9S8/ZnIn2S4 tubular photocatalyst. (e) Amounts of H2 generated from the prepared samples in 5 h under visible-light irradiation. (f) Photocatalytic reduction of aqueous Cr(VI) by as-prepared samples under visible-light irradiation. (g) Schematic illustration of the transfer process of the photogenerated electrons and holes in the Co9S8/ZnIn2S4 heterostructure, and the photocatalytic mechanism for Cr(VI) reduction and H2 evolution under visible-light irradiation. Reprinted with permission from Ref. [202]. Copyright 2020,Wiley-VCH GmbH.
Fig. 18. (a) The schematic illustration for the fabrication of CoSx/g-C3N4 composites. TEM images of hollow CoSx polyhedrons (b) and 2%CoSx/g-C3N4 composite (c). (d) Photocatalytic H2 generation rate of g-C3N4 and CoSx/g-C3N4 composites with different CoSx contents (1% to 10%) under visible-light (λ ≥ 400 nm) irradiation. Electrostatic potentials of the monolayer g-C3N4 surface (e) and the CoS (001) surface (f). (g) The 3D charge density difference for CoS/g-C3N4 composite model. The isosurface value is 0.0004 e/Å3. The yellow and cyan regions represent charge accumulation and depletion, respectively. (h) The possible mechanism for the photocatalytic H2 evolution over the CoSx/g-C3N4 composite photocatalyst. (i) The schemes of light path and photothermal effect in the hollow CoSx polyhedron. Reprinted with permission from Ref. [203]. Copyright 2018, American Chemical Society.
Fig. 19. Electrostatic potentials for monolayer g-C3N4 (a) and CoNiSx (b). (c) Charge density difference of CoNiSx-CN model. The yellow regions represent charge accumulation, whereas the cyan regions represent charge depletion. (d) Calculated free-energy diagram of photocatalytic HER for the photocatalysts. Reprinted with permission from Ref. [204]. Copyright 2019, American Chemical Society.
Fig. 20. (a) SEM (A, B, D, E, G, H, J and K) and TEM (C, F, I and L) images of MoSe2 nanospheres with different reaction times (M1: 1 h; M2: 6 h; M3: 12 h; M4: 36 h) at 180 °C. (b-d) The photocatalytic mechanism of MoSe2/CdSe heterostructure with different light irradiation wavelengths. Reprinted with permission from Ref. [207]. Copyright 2019, Elsevier B.V.
Fig. 21. (a) TEM images of Co/NGC@ZIS cages. (b) Schematic illustration for the synthetic process of hierarchical Co/NGC@ZIS cages. I: growth of ZIF-67 on ZIF-8 particles. II: carbonization in N2 and acid etching. III: growth of ZnIn2S4 NSs. (c) Photocatalytic H2 evolution activities of Co/NGC, Co/NGC@ZIS, ZnIn2S4, and p-Co/NGC@ZIS. (d) H2 production rates of Co/NGC@ZIS with varied compositions, the solid counterparts of Co/NGC@ZIS-S and NGC@ZIS-S, and Co3O4/NGC@ZIS. (e) Illustration of the photocatalytic H2 evolution mechanism on Co/NGC@ZIS under visible-light irradiation. Reprinted with permission from Ref. [210]. Copyright 2019, Wiley-VCH GmbH.
Fig. 22. TEM (a), magnified TEM (b,c) and HRTEM (d) images of MHMs. (e) EDS mapping of multi-shelled hollow Cu-CeO2 microspheres. Reprinted with permission from Ref. [213]. Copyright 2019, Elsevier B.V. (f,g) TEM images of Pd@void@Pt@CeO2 core@shell nanospheres. (h,i) TEM images of (Pt-enriched cage)@CeO2 core@shell nanospheres. Reprinted with permission from Ref. [215]. Copyright 2017, Wiley-VCH GmbH.
Fig. 23. (a-c) TEM images of CeO2/ZnIn2S4. (d) Rates of photocatalytic dehydrogenation of PhCH2OH for H2 evolution and PhCHO production with different catalysts with a reaction time of 3 h. EPR spectra of DMPO-%O2- (e) and DMPO-%OH (f) over CeO2, ZnIn2S4, and CeO2/ZnIn2S4 under solar exposure. (g) Charge carrier flow mechanisms over Type II and direct Z-scheme heterojunctions for the CeO2/ZnIn2S4 composite. Reprinted with permission from Ref. [218]. Copyright 2020, Elsevier B.V.
Fig. 24. (a) Schematic illustration of the synthetic procedures for CdS@ZnIn2S4 hollow cubes (direct Z-scheme heterojunction). FESEM (b) and TEM (c) images. Reprinted with permission from Ref. [221]. Copyright 2021, Elsevier B.V.
Fig. 25. (a) TEM image of Pd@CdS/1%PdS. (b) An illustration of the preparation of Pd@CdS/PdS catalyst. (c) Time courses of H2 evolution over Pd@CdS/1%PdS. (d) Proposed charge transfer mechanism of the Pd@CdS/PdS catalyst. Reprinted with permission from Ref. [225]. Copyright 2018, Wiley-VCH GmbH.
Fig. 26. (a) TEM image of Au@HCS@PdS. (b) Schematic illustration for the formation of Au@HCS@PdS photocatalyst. (c) The comparison of enhancement of hydrogen production with the optimal amount of cocatalysts. (d,e) Arrhenius plots obtained by fitting the rates of photocatalytic hydrogen and temperature. The apparent activation energies were calculated with the Arrhenius equation. (f) Schematic diagram of photocatalytic H2 evolution mechanism on Au@HCS@PdS composite under visible-light irradiation. Reprinted with permission from Ref. [132]. Copyright 2020, Elsevier B.V.
Fig. 27. SEM (a) and TEM (b) images of HCNS/Pt samples. (c) TEM and HRTEM images of Co3O4/HCNS/Pt samples. (d) Time courses of photocatalytic evolution of H2 and O2 using Co3O4/HCNS/Pt (e) and (Co3O4+Pt)/HCNS (f) under UV irradiation (λ > 300 nm). Reprinted with permission from Ref. [155]. Copyright 2016, Wiley-VCH GmbH.
Fig. 28. (a) TEM image of Pt/TiO2/CdS/Co3O4 hollow spheres. (b) schematic of the synthesis process of Pt/TiO2/CdS/Co3O4 composite hollow spheres; Illustration of the (c) structure and (d) reaction procedure of double-shelled hollow sphere photocatalyst. Schematic of (e) band structures in TiO2/CdS double-shelled hollow spheres and (f) activity energy reduction on the surface of photocatalyst with Pt and Co3O4 Co-catalyst. Reprinted with permission from Ref. [228]. Copyright 2017, Elsevier B.V.
Fig. 29. (a,b) TEM images of CdG2. (c) Photocatalytic CO2 reduction performance of CdS, CdG1, CdG2, CdG3, and CdG5. (d) Schematic illustration of NG/CdS HS preparation process. Reprinted with permission from Ref. [232]. Copyright 2019, Wiley-VCH GmbH.
Fig. 30. (a,b) TEM image of Au2.0@THS@CoO. (c) Illustrations of formation process of Aux@THS@CoO. (d) Comparison of the average formation rates of CH4 for THS, THS@CoO, and Au2.0@THS@CoO samples. (e) EPR spectra of Au2.0@THS@CoO in the presence of CO2 and N2 before and after simulated solar light irradiation. (f) In situ FTIR spectra of CO2 and H2O interaction with Au2.0@THS@CoO and THS in the dark and subsequently irradiated for different times. (g) The possible mechanism for photoreduction CO2 over Aux@THS@CoO. Reprinted with permission from Ref. [233]. Copyright 2019, Elsevier B.V.
Fig. 31. (a) Schematic illustration of the formation process of NiCo2O4 hollow microspheres composed of nanosheets. TEM images of (b) NiCoG, (c) NiCo-OH and (d) NiCo2O4 hollow spheres. (e) EPR spectra of NiCo2O4 hollow spheres and NiCo2O4 nanoparticles. (f) CO2 adsorption isotherms of NiCo2O4 hollow spheres and NiCo2O4 nanoparticles at 273.15?K. (g) CO and H2 generation from the photocatalyst system under different reaction conditions and the percentages of the CO selectivity of different catalysts. (h) Time courses and stability tests of CO and H2 production over NiCo2O4 hollow spheres. Reprinted with permission from Ref. [235]. Copyright 2019, Elsevier B.V.
Fig. 32. (a) TEM image of 120BB. (b,c) In situ FTIR spectra of CO2 and H2O reaction on 120BB. (d) In situ ESR spectra of 120BB in different situations. (e,f) Electron densities of BiOBr and BiOBr (OVs) by DFT calculation. (g) Proposed mechanism of CO2 photoreduction for BiOBr microspheres. Reprinted with permission from Ref. [236]. Copyright 2021, Elsevier B.V.
Fig. 33. High‐resolution XPS spectra of N 1s (a) and Pt 4f (b). (c) CO2 TPD curves for the HHBs, N‐HHBs, and Pt/N‐HHBs. (d) Photocatalytic mechanism scheme of Pt1/N0.25‐HHBs under simulated sunlight irradiation. Reprinted with permission from Ref. [238]. Copyright 2020, Elsevier B.V.
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