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Journal ArticleDOI: 10.1039/D0CY02212H

The enhancement of photocatalytic CO2 reduction by the in situ growth of TiO2 on Ti3C2 MXene

02 Mar 2021-Catalysis Science & Technology (The Royal Society of Chemistry)-Vol. 11, Iss: 4, pp 1602-1614
Abstract: The photocatalytic reduction of CO2 to solar fuel can solve energy crisis and global warming problems. Herein, TiO2/Ti3C2 was prepared via an improved sol–gel method and applied for the photocatalytic reduction of CO2. TEM, Raman, XPS, and other characterization results proved that TiO2 was grown in situ on Ti3C2 and formed a Schottky junction in the TiO2/Ti3C2 composite. The production rates of CO and CH4 for the optimal TiO2/Ti3C2 were 2.8 and 4.0 times higher than that of TiO2, respectively. The enhanced photocatalytic performance was due to the intimate interface between TiO2 and Ti3C2 with the formation of a Schottky junction, which promoted the separation of electron–hole pairs. The effect of the adsorption of TEOA on the photocatalytic performance was studied. Also, the mechanism for the photocatalytic reduction of CO2 in the TiO2/Ti3C2 system was proposed. This study shows that the intimate interface formed via the in situ growth of TiO2 on Ti3C2 is beneficial for the photocatalytic reduction of CO2.

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Topics: Photocatalysis (54%)
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9 results found


Journal ArticleDOI: 10.1021/ACS.ENERGYFUELS.1C00958
Muhammad Tahir1, Muhammad Tahir2, Azmat Ali Khan1, Azmat Ali Khan3  +4 moreInstitutions (3)
15 Jun 2021-Energy & Fuels
Abstract: Photocatalytic CO2 reduction to produce valuable chemicals and fuels using solar energy provides an appealing route to alleviate global energy and environmental problems. However, available semicon...

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Topics: Solar energy (52%), Efficient energy use (51%), Titanium carbide (51%)

6 Citations


Journal ArticleDOI: 10.1016/J.JECE.2021.105244
Abstract: MXene-based materials are favorable as cocatalyst for photocatalytic reduction of CO2 owing to their distinctive two-dimensional (2D) layered structure, large surface area, electrical conductivity and incredible chemical stability. Well-designed anatase TiO2 anchored Ti3C2/TiO2R composite was synthesized through ultrasonic approach, whereas controlled etching method was employed for in-situ growth of rutile TiO2 NPs. The TiO2 (rutile) nanoparticles were distributed onto the Ti3C2 MXene nanosheets, whereas, the increase in etching time from 24 to 96 h caused increased in the quantity of TiO2 embedded over Ti3C2 surface to produce Ti3C2/TiO2R. The resulting TiO2A/Ti3C2/TiO2R MXene composite was tested through different reforming systems which include CO2 reduction with H2O, dry reforming of methane (DRM) and bi-reforming of methane (BRM). Using CO2-water, the composite exhibited 85 and 18 μmol g−1 h−1 for CO and CH4 evolution, respectively, when photo-reduced with H2O. Using DRM process, CO and H2 were the main products with yield 47.8 and 13.8 µmol g−1 h−1, respectively. Using BRM, performance of composite was increased by 9.53 folds higher than using DRM process. The BRM process showed high efficiency and selectivity for hydrogen rich syngas production due to efficient oxidation process in the presence of water with yield 38.25 and 52.5 µmol g−1 h−1, respectively. These findings imply that TiO2A/ Ti3C2/TiO2R nanocomposite has the capability as a cocatalyst for high-performance photocatalytic material. Moreover, TiO2A coupled with Ti3C2/TiO2R showed excellent cycling stability without deactivation after three cycles and can be a potential structured material for other energy applications.

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Topics: Anatase (57%), Carbon dioxide reforming (54%), Photocatalysis (51%) ... show more

4 Citations


Journal ArticleDOI: 10.1039/D1CY00716E
Junyue Li1, Ziyi Wang1, Huayu Chen1, Qiqi Zhang1  +5 moreInstitutions (2)
Abstract: Photocatalytic reduction of carbon dioxide (CO2) into hydrocarbon fuels has attracted increasing research attention in recent years. However, the fast recombination of photoinduced charge carriers and poor adsorption/activation capability of CO2 molecules limit the photoconversion efficiency. Herein, we report on loading a two-dimensional (2D) titanium carbide (Ti3C2) MXene as a noble-metal-free cocatalyst onto zinc oxide (ZnO) via a facile electrostatic self-assembly method for efficient CO2 photoreduction. It is interesting to find that the ZnO loaded with 7.5 wt% of surface-alkalinized Ti3C2 exhibited remarkably improved evolution rates of CO (30.30 μmol g−1 h−1) and CH4 (20.33 μmol g−1 h−1), which were approximately 7-fold and 35-fold those of bare ZnO, respectively. The surface-alkalinized Ti3C2 MXene is believed to play a crucial role in improving the separation/transfer of photoinduced charge carriers and the adsorption/activation of CO2 molecules, accounting for the superior photocatalytic activity of CO2 reduction. Our work demonstrates that the Ti3C2 MXene could be employed as a noble-metal-free cocatalyst for efficient photocatalytic CO2 reduction.

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Topics: Photocatalysis (50%)

2 Citations


Journal ArticleDOI: 10.1016/J.APSUSC.2021.150849
Liuyun Chen1, Xie Xinling1, Tongming Su1, Hongbing Ji1  +2 moreInstitutions (2)
Abstract: Photocatalytic hydrogen production from water splitting production is a promising strategy to solve the energy crisis and environmental pollution. In the present work, Co3O4/CdS composites were prepared by ultrasonication and stirring, and used for photocatalytic water splitting. The results showed a Co-S chemical bonds were formed at the interfaces between the Co3O4 and the CdS, which promoted the charge transfer rate between the CdS and Co3O4. Meanwhile, the recombination of the electron-hole pairs was further restrained by the Co3O4/CdS p-n heterojunction. The 10%-Co3O4/CdS composites exhibited an excellent photocatalytic hydrogen production rate of 142.62 μmol∙h−1, which was 20 times higher than that of CdS (6.85 μmol∙h−1), and the Co3O4/CdS showed excellent stability in the photocatalytic water splitting reaction. Moreover, a formation process of Co3O4/CdS p-n heterojunction and a mechanism of Co3O4/CdS p-n heterojunction avoiding the recombination of photocatalytic electrons and holes to enhance photocatalytic activity was proposed.

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Topics: Photocatalytic water splitting (58%), Water splitting (55%), Environmental pollution (53%) ... show more

1 Citations


Open accessJournal ArticleDOI: 10.1039/D1NJ04439G
Abstract: Heterogeneous photocatalysis has been considered as one of the most attractive alternative routes to transform naturally abundant, clean, and sustainable solar energy into chemical energy. Considering efficient solar-energy utilisation, the development of new materials that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In recent years, many efforts have been focused on the development of pyrochlore oxides as visible light-responsive photocatalysts for the degradation of dyes, water splitting, and CO2 reduction. The interest in pyrochlores is attributed to their compositional flexibility to manipulate the electron/hole mobility by introducing a wide range of elements into their structure. The present perspective reports the progress over the last 5 years in the use of pyrochlore-like oxides as promising photocatalysts for various applications. A special focus of this perspective is on the strategies for the enhancement of the photocatalytic activity of pyrochlores, namely optimisation of their preparation method, band gap engineering, incorporation of plasmonic metals, and creation of heterojunctions.

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References
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53 results found


Journal ArticleDOI: 10.1038/238037A0
Akira Fujishima1, Kenichi Honda2Institutions (2)
07 Jul 1972-Nature
Abstract: ALTHOUGH the possibility of water photolysis has been investigated by many workers, a useful method has only now been developed. Because water is transparent to visible light it cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm (ref. 1).

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24,267 Citations


Open accessJournal ArticleDOI: 10.1002/ADMA.201102306
Michael Naguib1, Murat Kurtoglu1, Volker Presser1, Jun Lu2  +5 moreInstitutions (2)
04 Oct 2011-Advanced Materials
Abstract: Currently, however, there are relatively few such atomically layered solids. [ 2–5 ] Here, we report on 2D nanosheets, composed of a few Ti 3 C 2 layers and conical scrolls, produced by the room temperature exfoliation of Ti 3 AlC 2 in hydrofl uoric acid. The large elastic moduli predicted by ab initio simulation, and the possibility of varying their surface chemistries (herein they are terminated by hydroxyl and/or fl uorine groups) render these nanosheets attractive as polymer composite fi llers. Theory also predicts that their bandgap can be tuned by varying their surface terminations. The good conductivity and ductility of the treated powders suggest uses in Li-ion batteries, pseudocapacitors, and other electronic applications. Since Ti 3 AlC 2 is a member of a 60 + group of layered ternary carbides and nitrides known as the MAX phases, this discovery opens a door to the synthesis of a large number of other 2D crystals. Arguably the most studied freestanding 2D material is graphene, which was produced by mechanical exfoliation into single-layers in 2004. [ 1 ] Some other layered materials, such as hexagonal BN, [ 2 ] transition metal oxides, and hydroxides, [ 4 ] as well as clays, [ 3 ] have also been exfoliated into 2D sheets. Interestingly, exfoliated MoS 2 single layers were reported as early as in 1986. [ 5 ] Graphene is fi nding its way to applications ranging from supercapacitor electrodes [ 6 ] to reinforcement in composites. [ 7 ] Although graphene has attracted more attention than all other 2D materials combined, its simple chemistry and the weak van der Waals bonding between layers in multilayer structures limit its use. Complex, layered structures that contain more than one element may offer new properties because they

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Topics: Exfoliation joint (61%)

4,043 Citations


Open accessJournal ArticleDOI: 10.1038/NCOMMS13907
Jingrun Ran1, Guoping Gao2, Fa-tang Li1, Fa-tang Li3  +3 moreInstitutions (3)
Abstract: Scalable and sustainable solar hydrogen production through photocatalytic water splitting requires highly active and stable earth-abundant co-catalysts to replace expensive and rare platinum. Here we employ density functional theory calculations to direct atomic-level exploration, design and fabrication of a MXene material, Ti3C2 nanoparticles, as a highly efficient co-catalyst. Ti3C2 nanoparticles are rationally integrated with cadmium sulfide via a hydrothermal strategy to induce a super high visible-light photocatalytic hydrogen production activity of 14,342 μmol h−1 g−1 and an apparent quantum efficiency of 40.1% at 420 nm. This high performance arises from the favourable Fermi level position, electrical conductivity and hydrogen evolution capacity of Ti3C2 nanoparticles. Furthermore, Ti3C2 nanoparticles also serve as an efficient co-catalyst on ZnS or ZnxCd1−xS. This work demonstrates the potential of earth-abundant MXene family materials to construct numerous high performance and low-cost photocatalysts/photoelectrodes.

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Topics: Photocatalytic water splitting (60%), Hydrogen production (54%), Cadmium sulfide (52%) ... show more

882 Citations


Open accessJournal Article
Abstract: Scalable and sustainable solar hydrogen production through photocatalytic water splitting requires highly active and stable earth-abundant co-catalysts to replace expensive and rare platinum. Here we employ density functional theory calculations to direct atomic-level exploration, design and fabrication of a MXene material, Ti3C2 nanoparticles, as a highly efficient co-catalyst. Ti3C2 nanoparticles are rationally integrated with cadmium sulfide via a hydrothermal strategy to induce a super high visible-light photocatalytic hydrogen production activity of 14,342 μmol h−1 g−1 and an apparent quantum efficiency of 40.1% at 420 nm. This high performance arises from the favourable Fermi level position, electrical conductivity and hydrogen evolution capacity of Ti3C2 nanoparticles. Furthermore, Ti3C2 nanoparticles also serve as an efficient co-catalyst on ZnS or ZnxCd1−xS. This work demonstrates the potential of earth-abundant MXene family materials to construct numerous high performance and low-cost photocatalysts/photoelectrodes.

... read more

Topics: Photocatalytic water splitting (60%), Hydrogen production (54%), Cadmium sulfide (52%) ... show more

790 Citations



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