Fabrication of highly efficient and stable indirect Z-scheme assembly of AgBr/TiO2 via graphene as a solid-state electron mediator for visible light induced enhanced photocatalytic H2 production
Source abstract
Abstract
Abstract In this study, indirect Z-schematic assembly of AgBr and TiO2 via graphene as a solid-state electron mediator was developed and investigated for photocatalytic H2 production. The AgBr/rGO/TiO2 was fabricated using facile two-step synthesis method which includes the growth of AgBr and deposition of TiO2 on graphene oxide sheets followed by partial reduction through reflux method. The photocatalysts were characterized using TEM, XRD, XPS, FTIR, nitrogen (N2) adsorption and desorption, Raman, PL and UV–Vis spectroscopy to understand morphology, structure, chemical and optical properties. Alterations in band structures, elevation of conduction band positions and reduction in band gap energies of rGO-modified AgBr/TiO2 photocatalysts were evaluated. The performance of AgBr/rGO/TiO2 exhibited 2025 ppm of H2 production, which was 7 fold higher than AgBr/TiO2 (289 ppm), 2.3 fold higher than rGO/TiO2 (885 ppm) and 13.4 fold higher than TiO2 (151 ppm). Enhanced photocatalytic activity of Z-schematic composites can be attributed to strong interfacial bonding (AgBr—rGO–TiO2), efficient transfer of electrons due to synergistic effect of AgBr and rGO as well as extended light absorption due to highly light sensitive AgBr. In addition, yield of H2 production was decreased above 5% AgBr loading and dosage of 0.10 g of photocatalyst due to incompatibility of ratio and shielding effect of particles. Moreover, with increase of temperature and concentration of hole scavenger, yield of H2 production was gradually increased which demonstrated the contribution of H2 from photoreforming of hole scavenger. Based on the experimental and characterizations results, a possible mechanism that highlighted the surface redox reactions and charge transfer pattern on AgBr/rGO/TiO2 was developed. Thus, indirect Z-scheme assembly of AgBr/rGO/TiO2 could be a promising photocatalyst for solar energy assisted H2 production.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Covalent Organic Framework Applications · TiO2 Photocatalysis and Solar Cells
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (73)
Show source-provided references
1. How much does increasing non-fossil fuels in electricity generation reduce carbon dioxide emissions?10.1016/j.apenergy.2017.04.025 ↗
2. Seasonal climate change patterns due to cumulative CO2 emissions10.1088/1748-9326/aa6eb0 ↗
3. A review on air pollution, polluting agents and its possible effects in 21st century
4. Hydrogen production, storage, transportation and key challenges with applications: a review10.1016/j.enconman.2018.03.088 ↗
5. Analysis of tar obtained from hydrogen-rich syngas generated from a fi xed bed downdraft biomass gasification system10.1016/j.enconman.2018.04.092 ↗
6. Photocatalytic CO2 methanation over NiO/In2O3 promoted TiO2 nanocatalysts using H2O and/or H2 reductants10.1016/j.enconman.2016.04.057 ↗
7. Parametric study on the steam reforming of phenol-PET solution to hydrogen production over Ni promoted on Al2O3-La2O3 catalyst10.1016/j.enconman.2017.03.046 ↗
8. Remarkably enhanced photocatalytic hydrogen evolution over MoS2 nanosheets loaded on uniform CdS nanospheres10.1016/j.apsusc.2017.07.292 ↗
9. Recent progress in energy-driven water splitting10.1002/advs.201600337 ↗
10. Photocatalytic water splitting for solar hydrogen generation: fundamentals and recent advancements10.1080/0144235X.2015.1127027 ↗
11. Production of hydrogen by water splitting in a photoelectrochemical cell using a BiVO4/TiO2 layered photoanode10.1016/j.electacta.2017.08.125 ↗
12. High efficiency water splitting photoanodes composed of nano-structured anatase-rutile TiO2 heterojunctions by pulsed-pressure MOCVD10.1016/j.apcatb.2017.11.033 ↗
13. A critical review on TiO2 based photocatalytic CO2 reduction system: strategies to improve efficiency10.1016/j.jcou.2018.04.026 ↗
14. Advances in visible light responsive titanium oxide-based photocatalysts for CO2 conversion to hydrocarbon fuels10.1016/j.enconman.2013.07.046 ↗
15. CuInS2 sensitized TiO2 hybrid nano fi bers for improved photocatalytic CO2 reduction10.1016/j.apcatb.2018.02.042 ↗
16. Heterojunction photocatalysts10.1002/adma.201601694 ↗
17. Construction of Z-scheme Ag3PO4/Bi2WO6 composite with excellent visible-light photodegradation activity for removal of organic contaminants10.1016/S1872-2067(17)62942-5 ↗
18. Z-scheme g-C3N4@CsxWO3 heterostructure as smart window coating for UV isolating, Vis penetrating, NIR shielding and full spectrum photocatalytic decomposing VOCs10.1016/j.apcatb.2018.02.024 ↗
19. One-dimensional Z-scheme TiO2/WO3/Pt heterostructures for enhanced hydrogen generation10.1016/j.apsusc.2016.06.170 ↗
20. A review on TiO2-based Z-scheme photocatalysts10.1016/S1872-2067(17)62962-0 ↗
21. Highly dispersed TiO2 nanocrystals and WO3 nanorods on reduced graphene oxide: Z-scheme photocatalysis system for accelerated photocatalytic water disinfection10.1016/j.apcatb.2017.06.055 ↗
22. Wei Xiao, Enhanced photocatalytic performance of direct Z-scheme g-C3N4/TiO2 photocatalyst for decomposition of formaldehyde in air10.1039/c3cp53131g ↗
23. Highly enhanced photocatalytic degradation of methylene blue over the indirect all-solid-state Z-scheme g-C3N4-RGO-TiO2 nanoheterojunctions10.1016/j.apsusc.2017.01.285 ↗
24. Enhanced visible light activity on direct contact Z-scheme g-C3N4-TiO2 photocatalyst10.1016/j.apsusc.2016.06.145 ↗
25. Effect of rutile TiO2 on the photocatalytic performance of g-C3N4/brookite-TiO2-xNy photocatalyst for NO decomposition10.1016/j.apsusc.2016.09.075 ↗
26. Dual Z-scheme charge transfer in TiO2-Ag-Cu2O composite for enhanced photocatalytic hydrogen generation10.1016/j.jmat.2015.02.002 ↗
27. Uncovering the key role of Fermi level of electron mediator in Z-scheme photocatalyst by detecting charge transfer process of WO3-metal-gC3N4 (metal = Cu, Ag, Au)10.1021/acsami.5b10613 ↗
28. Graphene “bridge” in transferring hot electrons from plasmonic Ag nanocubes to TiO2 nanosheets for enhanced visible light photocatalytic hydrogen evolution10.1016/j.apcatb.2017.08.045 ↗
29. Direct Z-scheme TiO2/CdS hierarchical photocatalyst for enhanced photocatalytic H2-production activity10.1016/j.apsusc.2017.06.028 ↗
30. Construction of Z-scheme Ag2CO3/N-doped graphene photocatalysts with enhanced visible-light photocatalytic activity by tuning the nitrogen species10.1016/j.apsusc.2016.11.168 ↗
31. Enhanced photoinduced stability and photocatalytic activity of AgBr photocatalyst by surface modification of Fe(III) cocatalyst10.1016/j.apcatb.2013.06.023 ↗
32. Silver bromide as a photocatalyst for hydrogen generation from CH3OH/H2O solution10.1021/jp990287q ↗
33. Photocatalytic reduction of CO2 to hydrocarbons using AgBr/TiO2 nanocomposites under visible light10.1016/j.cattod.2011.02.055 ↗
34. Facile fabrication of efficient AgBr-TiO2 nanoheterostructured photocatalyst for degrading pollutants and its photogenerated charge transfer mechanism10.1016/j.jhazmat.2012.10.017 ↗
35. AgBr@ TiO2/GO ternary composites with enhanced photocatalytic activity for oxidation of benzyl alcohol to benzaldehyde10.1007/s11164-016-2747-9 ↗
36. Highly efficient and recyclable nanocomplexed photocatalysts of AgBr/N-doped and amine-functionalized reduced graphene oxide10.1021/am5051422 ↗
37. Two different roles of metallic Ag on Ag/AgX/BiOX (X = Cl, Br) visible light photocatalysts: surface plasmon resonance and Z- scheme bridge10.1021/cs300213m ↗
38. improved synthesis of graphene oxide10.1021/nn1006368 ↗
39. Semiconductor-to-metallic flipping in a ZnFe2O4-graphene based smart nano-system: temperature/microwave magneto-dielectric spectroscopy10.1016/j.matchar.2014.11.018 ↗
40. Hierarchical nanotubular anatase/rutile/TiO2 (B) heterophase junction with oxygen vacancies for enhanced photocatalytic H2 production10.1021/acs.langmuir.7b03745 ↗
41. Double Z-scheme system of silver bromide@bismuth tungstate/tungsten trioxide ternary heterojunction with enhanced visible-light photocatalytic activity10.1016/j.jcis.2017.08.095 ↗
42. AgBr and g-C3N4 co-modified Ag2CO3 photocatalyst: a novel multi-heterostructured photocatalyst with enhanced photocatalytic activity10.1016/j.apsusc.2016.07.021 ↗
43. Fabrication of TiO2 nanorod assembly grafted rGO (rGO@TiO2-NR) hybridized flake-like photocatalyst10.1016/j.apsusc.2016.03.195 ↗
44. Single-step hydrothermal synthesis of wrinkled graphene wrapped TiO2 nanotubes for photocatalytic hydrogen production and supercapacitor applications10.1016/j.materresbull.2017.10.034 ↗
45. Reduced graphene oxide@TiO2 nanorod@reduced graphene oxide hybrid nanostructures for photoelectrochemical hydrogen production10.1049/mnl.2016.0747 ↗
46. A facile way to synthesize Ag@AgBr cubic cages with efficient visible-light-induced photocatalytic activity10.1016/j.apcatb.2014.08.037 ↗
47. Single-crystalline AgIn(MoO4)2 nanosheets grafted Ag/AgBr composites with enhanced plasmonic photocatalytic activity for degradation of tetracycline under visible light10.1016/j.apcatb.2014.09.046 ↗
48. A novel photocatalyst AgBr/ZnO/RGO with high visible light photocatalytic activity10.1016/j.ceramint.2015.11.124 ↗
49. Effect of photocatalytic reduction of carbon dioxide by N-Zr co-doped nano TiO210.1080/09593330.2016.1272642 ↗
50. Probing the interfacial chemistry of ultrathin ALD-grown TiO2 films: an in-line XPS study10.1021/acs.jpcc.6b09468 ↗
51. Fabrication of TiO2 nanosheet aarrays/graphene/Cu2O composite structure for enhanced photocatalytic activities10.1186/s11671-017-2088-7 ↗
52. Self-assembly of nitrogen-doped TiO2 with exposed 001 facets on a graphene scaffold as photo-active hybrid nanostructures for reduction of carbon dioxide to methane10.1007/s12274-014-0514-z ↗
53. Comparison of few-layer graphene prepared from natural graphite through fast synthesis approach10.1016/j.jmst.2015.07.014 ↗
54. Reduced graphene oxide-TiO2 nanocomposite as a promising visible-light-active photocatalyst for the conversion of carbon dioxide10.1186/1556-276X-8-465 ↗
55. Fast and facile preparation of CTAB based gels and their applications in Au and Ag nanoparticles synthesis10.1016/j.matchemphys.2015.02.032 ↗
56. High-efficient synthesis of graphene oxide based on improved hummers method10.1038/srep36143 ↗
57. Synthesis and excellent visible light photocatalysis performance of magnetic reduced graphene oxide/ZnO/ZnFe2O4 composites10.1039/C7RA02083J ↗
58. A direct charger transfer from interface to surface for the highly efficient spatial separation of electrons and holes: the construction of Ti–C bonded interfaces in TiO2-C composite as a touchstone for photocatalytic water splitting10.1016/j.nanoen.2017.01.030 ↗
59. Hydrothermal synthesis of an artificial Z-scheme visible light photocatalytic system using reduced graphene oxide as the electron mediator10.1016/j.cej.2016.11.036 ↗
60. Towards full-spectrum (UV, visible, and near-infrared) photocatalysis: achieving an all-solid-state Z-scheme between Ag2O and TiO2 using reduced graphene oxide as the electron mediator10.1039/C7CY01349C ↗
61. Hierarchical porous anatase TiO2 derived from a titanium metal–organic framework as a superior anode material for lithium ion batteries10.1039/C5CC03381K ↗
62. Application of Ag/AgBr/GdVO4 composite photocatalyst in wastewater treatment10.1016/j.jes.2017.06.020 ↗
63. Fabrication of plasmonic AgBr/Ag nanoparticles-sensitized TiO2 nanotube arrays and their enhanced photo-conversion and photoelectrocatalytic properties10.1016/j.jpowsour.2014.08.061 ↗
64. Fabrication of Z-scheme plasmonic photocatalyst Ag@AgBr/g-C3N4 with enhanced visible-light photocatalytic activity10.1016/j.jhazmat.2014.02.023 ↗
65. Synergistic effect in MMT-dispersed Au/TiO2 monolithic nanocatalyst for plasmon-absorption and metallic interband transitions dynamic CO2 photo-reduction10.1016/j.apcatb.2017.07.062 ↗
66. Reduced graphene oxide as a solid-state electron mediator in Z-scheme photocatalytic water splitting under visible light10.1021/ja203296z ↗
67. Photocatalytic CO2 reduction using water as an electron donor by a powdered Z-scheme system consisting of metal sulfide and an RGO–TiO2 composite10.1039/C6FD00215C ↗
68. Comparison of catalytic activity of carbon-based AgBr nanocomposites for conversion of CO2 under visible light10.1016/j.jscs.2013.08.003 ↗
69. Photocatalytic degradation of methyl orange using hematoporphyrin/N-doped TiO2 nanohybrids under visible light: Kinetics and energy consumption10.1002/aoc.3755 ↗
70. Scalable water splitting on particulate photocatalyst sheets with a solar-to-hydrogen energy conversion efficiency exceeding 1%10.1038/nmat4589 ↗
71. Continuous flow gas phase photoreforming of methanol at elevated reaction temperatures sensitised by Pt/TiO210.1039/C6RE00140H ↗
72. Universal electrode interface for electrocatalytic oxidation of liquid fuels10.1021/am504926r ↗
73. Kinetic and mechanistic study of the photocatalytic reforming of methanol over Pt/TiO2 catalyst10.1016/j.apcatb.2013.03.018 ↗