Synthesis of TiO2−x/W18O49 hollow double-shell and core–shell microspheres for CO2 photoreduction under visible light

Tan, Jeannie Z. Y.; Gavrielides, Stelios; Belekoukia, Meltiani; Thompson, Warren A.; Negahdar, Leila; Xia, Fang; Maroto‐Valer, M. Mercedes; Beale, Andrew M.

doi:10.1039/d0cc04036c

Cited by 18 publications

(13 citation statements)

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“…Notably, the merits of a narrow band gap, fast charge migration, and outstanding light absorption capacity endow tungsten oxide (WO 3– x ) as a suitable candidate for constructing a heterojunction with g-C 3 N 4 . W 18 O 49 , with plentiful W 5+ defects and oxygen vacancies, can broaden the wavelength range of light absorption, indicating that more electrons can be excited. , In previous work, core–shell microspheres of TiO 2– x /W 18 O 49 were prepared via a solvothermal treatment and the presence of W 18 O 49 could enhance the optical capturing range of this composite . In another report, W 18 O 49 /TiO 2 photocatalysts were obtained by Huang et al and showed outstanding activity.…”

Section: Introductionmentioning

confidence: 98%

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

et al. 2021

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In this work, an urchinlike W18O49/g-C3N4 composite was fabricated via a simple hydrothermal process. The photocatalytic CO2 conversion reaction was applied to evaluate the photocatalytic behavior of this catalytic system, and the WOCN-20 wt % heterojunction displayed superior photocatalytic behavior under full spectrum light irradiation, which was 6.46 μmol·h–1·g–1 for CO and 3.97 μmol·h–1·g–1 for CH4, respectively. Furthermore, in the near-infrared region, the composite photocatalysts also displayed excellent photocatalytic performance. A large number of characterizations and testing measures were carried out to study the components, morphology, and physicochemical properties of W18O49/g-C3N4 photocatalyst, which were helpful to exploring and understanding the reasons for the improvement of catalytic performance. The boosted activity resulted from the tight contact between W18O49 and g-C3N4 and the formation of a Z-scheme heterojunction. The local surface plasmonic resonance (LSPR) of W5+ also contributed to the realization of efficient photocatalysis under near-infrared light. The Z-scheme electron transport model could realize the efficient separation of light-induced e––h+ pairs and reduce the recombination rate, thereby boosting the CO2 photocatalytic reduction process.

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Section: Introductionmentioning

confidence: 98%

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

et al. 2021

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“…[17][18][19][20] Among them, heterojunction construction is proved to be an effective strategy due to the efficient transfer and separation of photogenerated charge carriers. [21][22][23] The preparation processes of hierarchical TiO 2 @ZnIn 2 S 4 coreshell hollow spheres (CSHS) are illustrated in Figure 1a. Firstly, SiO 2 spheres with average diameters of 350 nm as the hard-templates are prepared by a modified Stöber method (Figure S1a, Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

In situ Irradiated XPS Investigation on S‐Scheme TiO₂@ZnIn₂S₄ Photocatalyst for Efficient Photocatalytic CO₂ Reduction

Wang

Cheng

Zhang

et al. 2021

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Recently, a novel step-scheme (S-scheme) heterojunction was proposed and has attracted researchers' attention. [23][24][25][26][27][28][29][30][31][32][33][34][35][36] Usually, S-scheme heterojunction consists of reduction photocatalyst (RP) and oxidation photocatalyst (OP). Besides, the directional migration of free electrons will lead to band bending and internal electric field (IEF) at their interface owing to the work function difference. Notably, under the influence of IEF, the photogenerated electrons of OP with weak reduction ability can recombine with the photogenerated holes of RP with weak oxidation ability; while those with strong redox abilities are preserved. Therefore, reasonable construction of TiO 2 -based S-scheme heterojunction is of great significance to improve photocatalytic reaction performance. Apart from the charge carrier separation, the morphology of photocatalysts is another important factor to influence the photocatalytic performance. [15,17,19,37,38] Photocatalysts with hollow structures have attracted great attention owing to manifold advantages including larger specific surface area, abundant active sites, shortened diffusion distance as well as improved light reflection and scattering. [37,[39][40][41][42][43][44] Therefore, the design of hollow S-scheme heterojunction photocatalyst is of vital importance to enhance photocatalytic performance.ZnIn 2 S 4 , as a typical reduction photocatalyst, stands out for its layered structure, narrow bandgap, suitable redox potentials, and good chemical stability. And it has been used for various photocatalytic applications including hydrogen production, CO 2 reduction, and organic degradation. [45][46][47][48][49][50][51] Unfortunately, pristine ZnIn 2 S 4 photocatalyst shows low photocatalytic efficiency owing to the fast recombination of photogenerated charge carriers. [45][46][47][48][49] Considering the suitable match of band gap of ZnIn 2 S 4 and TiO 2 for S-scheme heterojunction, [27,52] we construct the hollow TiO 2 @ZnIn 2 S 4 core-shell structure. Up to now, to the best of our knowledge, it has never been reported.Herein, we grow ZnIn 2 S 4 nanosheets on the outer surface of TiO 2 hollow spheres by in situ chemical bath deposition reaction. This rational design is not only able to provide large specific surface areas and abundant reaction sites for PCR reaction, but also can effectively suppress the recombination of useful photogenerated electrons and holes. As a result, the optimized TiO 2 @ZnIn 2 S 4 heterojunction exhibits high PCR performance, and the total CO 2 photoreduction conversion rates (the sum yield of CO, CH 3 OH and CH 4 ) are obviously higher than those of blank ZnIn 2 S 4 , TiO 2 , and ex situ prepared TiO 2 -ZnIn 2 S 4 composite. Finally, S-scheme mechanism is also thoroughly analyzed and discussed in this work.Reasonable design of efficient hierarchical photocatalysts has gained significant attention. Herein, a step-scheme (S-scheme) core-shell TiO 2 @ZnIn 2 S 4 heterojunction is designed for photocatalytic CO 2 redu...

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“…So far, the synthesis of inorganic nanomaterials has been explored with a view to the nature of precursors, the structures and properties of products as well as the feasibility and simplification of methods. For instance, Sun et al successfully prepared GdMnO 3 material using a typical sol-gel method and subsequently in-situ generated GdMn 2 O 5 /GdMnO 3 materials by acid treatment for oxygenated VOC complete oxidation; [ [51] Deng and coworkers fabricated TiO 2 supported Pt nano-/single-atom-catalyst by using the molten salt method, and 0.2 wt% Pt catalyst showed high catalytic activity for toluene removal. [52] Our team once created superparamagnetic ferroferric oxide nanoparticles by coprecipitation method, and then yielded hydrophilic or hydrophobic targeting biomaterials by a few modifications.…”

Section: Synthesis Of Inorganic Nanomaterialsmentioning

confidence: 99%

A power-triggered preparation strategy of nano-structured inorganics: sonosynthesis

Dong

Wang

et al. 2021

Nanoscale Adv.

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Synthesis of TiO_2−x/W₁₈O₄₉ hollow double-shell and core–shell microspheres for CO₂ photoreduction under visible light

Abstract: The fabrication of core–shell and double-shelled hollow microspheres of W18O49 (blue) and self-assembled TiO2−x for enhanced CO2 photoreduction to CO under visible light irradiation.

Cited by 18 publications

References 34 publications

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

In situ Irradiated XPS Investigation on S‐Scheme TiO₂@ZnIn₂S₄ Photocatalyst for Efficient Photocatalytic CO₂ Reduction

A power-triggered preparation strategy of nano-structured inorganics: sonosynthesis

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Synthesis of TiO2−x/W18O49 hollow double-shell and core–shell microspheres for CO2 photoreduction under visible light

Abstract: The fabrication of core–shell and double-shelled hollow microspheres of W18O49 (blue) and self-assembled TiO2−x for enhanced CO2 photoreduction to CO under visible light irradiation.

Cited by 18 publications

References 34 publications

Urchinlike W18O49/g-C3N4 Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO2 under Full Spectrum Light

Urchinlike W18O49/g-C3N4 Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO2 under Full Spectrum Light

In situ Irradiated XPS Investigation on S‐Scheme TiO2@ZnIn2S4 Photocatalyst for Efficient Photocatalytic CO2 Reduction

A power-triggered preparation strategy of nano-structured inorganics: sonosynthesis

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Synthesis of TiO_2−x/W₁₈O₄₉ hollow double-shell and core–shell microspheres for CO₂ photoreduction under visible light

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

Urchinlike W₁₈O₄₉/g-C₃N₄ Z-Scheme Heterojunction for Highly Efficient Photocatalytic Reduction of CO₂ under Full Spectrum Light

In situ Irradiated XPS Investigation on S‐Scheme TiO₂@ZnIn₂S₄ Photocatalyst for Efficient Photocatalytic CO₂ Reduction