In-situ constructing S-scheme/Schottky junction and oxygen vacancy on SrTiO3 to steer charge transfer for boosted photocatalytic H2 evolution

Li, Chuanqi; Yi, Shasha; Liu, Yan; Niu, Zong Wei; Yue, Xinzheng; Liu, Zhongyi

doi:10.1016/j.cej.2021.129231

Cited by 79 publications

(20 citation statements)

References 54 publications

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“…The EPR test was conducted to further confirm the existence of oxygen vacancies in the Mn-SrTiO3@CF sample, as shown in Figure 6. It can be observed from Figure 6 that the Mn-SrTiO3@CF sample has a strong peak at g ≈ 2.003, indicating the existence of oxygen vacancies in the Mn-SrTiO3@CF sample [34,35]. The generation of oxygen vacancies in the Mn-SrTiO3@CF sample may be caused by the fact in the carbonization process of bamboo pulp fibers loaded with SrTiO3, a part of C reacts with O in SrTiO3, and after SrTiO3 is treated at high temperature in argon atmosphere, a part of O in the lattices sheds off, thus forming oxygen defects.…”

Section: Resultsmentioning

confidence: 98%

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

Niu

Zhang

et al. 2022

Materials

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With carbon fiber, it is difficult to load semiconductor photocatalysts and easy to shed off thanks to its smooth surface and few active groups, which has always been a problem in the synthesis of photocatalysts. In the study, SrTiO3 nanoparticles were loaded onto the Tencel fibers using the solvothermal method, and then the Tencel fibers were carbonized at a high temperature under the condition of inert gas to form carbon fibers, thus SrTiO3@CF photocatalytic composite materials with solid core shell structure were prepared. Meanwhile, Mn ions were added into the SrTiO3 precursor reagent in the solvothermal experiment to prepare Mn-doped Mn-SrTiO3@CF photocatalytic composite material. XPS and EPR tests showed that the prepared Mn-SrTiO3@CF photocatalytic composite was rich in oxygen vacancies. The existence of these oxygen vacancies formed oxygen defect states (VOs) below the conduction band, which constituted the capture center of photogenerated electrons and significantly improved the photocatalytic activity. The photocatalytic hydrogen experimental results showed that the photocatalytic hydrogen production capacity of Mn-SrTiO3@CF composite material with 5% Mn-doped was six times that of the SrTiO3@CF material, and the doping of Mn ions not only promoted the red shift of the light absorption boundary and the extension to visible light, but also improved the separation and migration efficiency of photocarriers. In the paper, the preparation method solves the difficulty of loading photocatalysts on CF and provides a new design method for the recycling of catalysts, and we improve the hydrogen production performance of photocatalysts by Mn-doped modification and the introduction of oxygen vacancies, which provides a theoretical method for the practical application of hydrogen energy.

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Section: Resultsmentioning

confidence: 98%

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

Niu

Zhang

et al. 2022

Materials

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“…Therefore, numerous S‐scheme photocatalysts for splitting H 2 O into H 2 have been developed, e.g., S‐pCN/WO 2.7 , N‐doped MoS 2 /S‐doped g‐C 3 N 4 , g‐C 3 N 4 /Bi 2 MoO 6 , g‐C 3 N 4 /CdS, Py‐CNTs, Bi 2 S 3 /g‐C 3 N 4 , CuI‐GD/g‐C 3 N 4 , CdS/MoO 3– x , SnNb 2 O 6 /CdS, TiO 2 /CdS, CdS/W 18 O 49 , NiTiO 3 @Co 9 S 8 , Ru/SrTiO 3 /TiO 2 , WO 3 /TiO 2 , and g‐C 3 N 4 /MS 2 (M = Sn, Zr). [ 28–42 ] Li et al utilized solvent evaporation method to spontaneously assemble S‐introduced g‐C 3 N 4 and nonstoichiometric WO 2.72 for S‐scheme photocatalytic H 2 O splitting into H 2 evolution. [ 28 ] In Figure 5b, oxygen vacancies with electron defect states on WO 2.72 were interacted with S and N lone pair electrons of g‐C 3 N 4 , resulting in close interfaces.…”

Section: S‐scheme Photocatalystsmentioning

confidence: 99%

S‐Scheme Photocatalytic Systems

et al. 2021

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Recently, step‐scheme (S‐scheme) photocatalysts have received widespread attention in the field of solar fuel development and transformation because of efficient charge spatial separation along with strong redox capabilities. Herein, the development history of S‐scheme photocatalysts is summarized and reviewed, from Z‐scheme photocatalysts to S‐scheme photocatalysts. Advantages of S‐scheme photocatalysts are also discussed in depth and detail, including design principles and construction strategies as well as charge transfer mechanisms. In addition, identification characterizations for S‐scheme photocatalysts and their solar energy conversion applications are also reviewed. Finally, conclusions and outlooks for solar energy conversion challenges are demonstrated. It provides insights and up‐to‐date information to enable the scientific community to fully tap into the potential of S‐scheme photocatalysts in renewable energy generation and environmental remediation.

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“…XRD patterns of the prepared catalysts are exhibited in Figure S4a. The lattice planes of all catalysts are well-consistent with SrTiO 3 (JCPDS # 35-0734) . As shown in Table S1, both the relative intensity of the (110) plane (at 32.3°) and crystalline size (6.7–19.9 nm) of the FHP templated catalysts are lower than those of pure SrTiO 3 (42.8 nm), which suggests that the FHP template has a nanoscale confinement effect on the crystallization and growth of catalysts.…”

Section: Resultsmentioning

confidence: 65%

“…The lattice planes of all catalysts are well-consistent with SrTiO 3 (JCPDS # 35-0734). 30 As shown in Table S1, both the relative intensity of the (110) plane (at 32.3°) and crystalline size (6.7−19.9 nm) of the FHP templated catalysts are lower 31 and the diffraction peak of the (200) crystal plane of SrTiO 3 is enhanced, which may affect the performance of CB destruction. As exhibited in Figure S4b,c and Table S1, the N 2 adsorption−desorption isotherms of the prepared catalysts (except Pure SrTiO 3 ) show a type-IV curve with H2 type hysteresis loops at a P/P 0 of 0.7−0.9, indicating that there are macroporous and ink bottle-shaped mesoporous geometry in the samples.…”

Section: Resultsmentioning

confidence: 99%

Biotemplate Fabrication of Hollow Tubular Ce_xSr_1–xTiO₃ with Regulable Surface Acidity and Oxygen Mobility for Efficient Destruction of Chlorobenzene: Intrinsic Synergy Effect and Reaction Mechanism

Sun

Bai

et al. 2022

Environ. Sci. Technol.

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Developing economic and applicable catalysts with elegant chlorine resistance and organic byproduct inhibition capability is of great significance for chlorinated volatile organic compounds (Cl-VOCs) eco-friendly purification. Here, ternary Ce x Sr1–x TiO3 catalysts with tunable surface acidity and oxygen species mobility were creatively fabricated using the hollow tubular-structured fruit hair of Platanus (FHP; a widespread greenery waste) as the scaffolding biotemplate. It is shown that the oxygen vacancy (Ov) triggered by the presence of Ce can optimize the synergy between the Lewis acid sites (LAS) and Brønsted acid sites (BAS). High concentration of Ov and BAS promotes the C–Cl cleavage of chlorobenzene (CB) and accelerates the desorption of Cl• radicals as inorganic chlorine. Simultaneously, the strong electron transfer within Ti-Ce-Sr linkage increases the acidity of LAS, resulting in the superior reducibility of Ce0.4Sr0.6TiO3 and facilitating the deep oxidation of dechlorination intermediates. Additionally, the spatial confinement of the tubular structure remarkably accelerates the CB flow rate and reduces the residence time of byproducts over the prepared catalysts. Owing to these, CB can be efficiently destructed over Ce0.4Sr0.6TiO3 with selectivity of CO2 and inorganic chlorine dramatically enhanced, respectively, approximately 16 and 21 times at 275 °C compared to those of pure SrTiO3. The present work provides a feasible and promising strategy for engineering efficient catalysts for heterogeneous thermocatalytic reactions for industrial-scale Cl-CVOC destruction.

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In-situ constructing S-scheme/Schottky junction and oxygen vacancy on SrTiO3 to steer charge transfer for boosted photocatalytic H2 evolution

Cited by 79 publications

References 54 publications

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

S‐Scheme Photocatalytic Systems

Biotemplate Fabrication of Hollow Tubular Ce_xSr_1–xTiO₃ with Regulable Surface Acidity and Oxygen Mobility for Efficient Destruction of Chlorobenzene: Intrinsic Synergy Effect and Reaction Mechanism

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In-situ constructing S-scheme/Schottky junction and oxygen vacancy on SrTiO3 to steer charge transfer for boosted photocatalytic H2 evolution

Cited by 79 publications

References 54 publications

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

Fabrication of Mn-Doped SrTiO3/Carbon Fiber with Oxygen Vacancy for Enhanced Photocatalytic Hydrogen Evolution

S‐Scheme Photocatalytic Systems

Biotemplate Fabrication of Hollow Tubular CexSr1–xTiO3 with Regulable Surface Acidity and Oxygen Mobility for Efficient Destruction of Chlorobenzene: Intrinsic Synergy Effect and Reaction Mechanism

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Resources

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Biotemplate Fabrication of Hollow Tubular Ce_xSr_1–xTiO₃ with Regulable Surface Acidity and Oxygen Mobility for Efficient Destruction of Chlorobenzene: Intrinsic Synergy Effect and Reaction Mechanism