RSC Advances
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2016
·Vol. 6
·期 24
·19878-19886
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IF 3.289
Guoling Wu,Lisong Xiao,Wei Gu,Weidong Shi,Dayu Jiang,Chunbo Liu
Extending the light absorption range and facilitating the separation of photoinduced carriers are effective strategies in the process of improving photocatalysis. An effective method is to construct a heterostructure. In this work, a new heterojunction, CdS/SrTiO3, was synthesized via a two step hydrothermal route and designed to decontaminate hazardous wastewater containing antibiotics under visible light irradiation. Specially, the efficient photocatalytic performance of the composites could be ascribed to the enhancement of visible light absorption efficiency and the efficient separation of the photoexcited carriers originating from the heterointerface. Furthermore, a plausible photocatalytic mechanism has been discussed in detail based on trap experiments and ESR analysis results. The CdS/SrTiO3 heterojunction has potential to be applied for purifying antibiotic pollutants in environmental wastewater because of its high efficiency and stability.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 9
·3039-3046
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IF 6.119
Yuxiang Liu,Xuejun Xu,Shangchun Lv,Hewen Li,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng
Aluminium doped strontium titanate, SrTiO3(Al), is considered as the most promising candidate photocatalyst for water splitting; however, it suffers from fast recombination of photogenerated charges and little photocatalytic activity for overall water splitting. Precious metals, such as RhCrOx, are always needed as cocatalysts to enhance the photocatalytic performance. Herein, nitrogen doped graphene quantum dots (NGQDs) were prepared and applied as a hydrogen evolution reaction (HER) cocatalyst of SrTiO3(Al)/CoOx for photocatalytic overall water splitting. The designed NGQDs/SrTiO3(Al)/CoOx is highly active for overall water splitting achieving a H2 evolution rate of 18.8 μmol h−1 and an O2 evolution rate of 9.0 μmol h−1, respectively. The NGQDs and CoOx are dispersed on the different crystal facets of octagonal SrTiO3(Al), which is beneficial to the spatial separation of photogenerated electrons and holes. The strong interaction between NGQDs and SrTiO3(Al) via Ti–O–C chemical bonds enhances the charge transfer and separation. Moreover, the pyrrole N species within NGQD networks act as active sites for the hydrogen evolution reaction.
研究领域:
材料科学
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化学
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纳米技术
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光催化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
·Vol. 48
·期 13
·18876-18883
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IF 5.532
Zhixin Ma,Yang Qi,Jun Wang,Xiaoguo Bi,Xu-dong Liu,Xiaodong Li,Ji-guang Li,Xudong Sun
SrTiO 3 is a promising thermoelectric material for applications in harsh environments, owing to its excellent thermoelectric (TE) properties and high-temperature stability. The effect of annealing in carbon powders on the TE properties of SrTiO 3−δ in the [111] direction was experimentally investigated and analysed using first-principles calculation. The electrical conductivity of the SrTiO 3−δ single crystals in the [111] direction increases with an increase in annealing temperature in the range of 1573–1673 K, which is opposite to that in the [510] direction as shown in a previous experiment. This is attributed to the different variation trend of carrier concentration. First-principle calculation results show that the carrier concentration in the [111] direction increases with increasing oxygen vacancy concentration, but it is the opposite in the [510] direction. Strong anisotropy of carrier concentration should be caused by the difference in atomic arrangement, making difference in the amount of free electrons that maybe constrained at high oxygen vacancy in different directions. Although the SrTiO 3−δ single crystal annealed at 1573 K shows a lower electrical conductivity, it obtains higher power factor with the maximum value of 2.24 mW m −1 K −2 at 323 K, which is predominantly due to its higher effective mass. It also yields the highest ZT value of 0.18 at 873 K owing to the lower thermal conductivity . The results of this study are imperative for the design and development of perovskite TE materials.
研究领域:
材料科学
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凝聚态物理
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热电材料
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晶体学
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固体化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Yan Lin,Shaohua Wu,Xiang Li,Xin Wu,Chunping Yang,Guangming Zeng,Yanrong Peng,Qi Zhou,Li Lu
Visible-light-driven photocatalysis as a promising technology has recently attracted great attention in environmental remediation. In this work, novel Z-scheme heterojunction photocatalysts Ag 3 PO 4 @MWCNTs@Cr:SrTiO 3 with excellent visible-light-driven photocatalytic performance and photostability were successfully synthesized and characterized. The photocatalytic activity for malachite green (MG) degradation was measured, and photodegradation mechanisms were investigated using GC–MS, ESR, and radical trapping experiments. On consideration of the practical applications, the effects of coexisting ions and pH were also evaluated. Results showed that significant changes of crystal size and micro-morphology for Ag 3 PO 4 were observed before and after the addition of MWCNTs, which transformed from a polyhedron with a diameter of about 30 μm into a spherical-like crystal with a diameter of 0.28–0.69 μm. This phenomenon was reported for the first time. The optimal catalyst with a dosage of 100 mg/g (the mass ratio of pollutant to photocatalyst) could reach 100% MG removal in 6 and 10 min under natural solar radiation and visible light irradiation, respectively. Results from the radical trapping experiments and ESR analysis confirmed that there existed the Z-scheme transfer mechanisms, and O 2 − and h + played an important role during the photocatalytic degradation. Several small molecular organic acids such as acetic acid, glyoxylic acid, fumaric acid and benzoic acid were detected by GC–MS in the photodegradation products of MG, which further indicates that photocatalytic degradation pathway involved N -demethylation, benzene removal and open-ring reactions. The performance of the photocatalyst would be inhibited under strong acid condition or at the coexistence of certain concentration of Cr 6+ and Cl − . The novel addition of MWCNTs in the preparation and the changes of crystal structure and properties for the photocatalysts have the potential to promote the application of the photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Chuan Yu,Shenyu Lan,Sentai Cheng,Lixi Zeng,Mingshan Zhu
Removal of pharmaceuticals and personal care products (PPCPs) from water by mechanical energy-driven piezocatalysis is a promising technology for environmental remediation that highly depends on the design of efficient piezocatalyst. In this study, Ba-substituted SrTiO 3 piezoelectric materials were constructed and used for piezocatalytic degradation of carbamazepine (CBZ) from water. The Ba 0.5 Sr 0.5 TiO 3 (BSTO-2) achieved the optimal performance, exhibiting 94.5% removal efficiency for CBZ (10 mg/L) after 30 min in the presence of BSTO-2 (0.5 g/L) and ultrasonic vibration (40 kHz, 100 W) with the minimal energy consumption. The kinetic rate constant was up to 0.106 min −1 , which were 1.86 and 2.08 times as high as that of pure SrTiO 3 and BaTiO 3 , respectively. The enhanced piezocatalytic activity was attributed to its distorted structure and modified conductivity, resulting in a higher piezoelectric response and faster interfacial charge transfer. The involved reactive species, the effects of operational condition (catalyst dosage, CBZ concentration, solution pH, anions, water matrices and different pollutants), and the possible degradation products and their toxicity were discussed in detail. The work is of great significance to develop highly efficient piezocatalysts and highlights the potential of piezocatalysis in water remediation .
研究领域:
环境科学
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材料科学
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水处理技术
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2016
·Vol. 40
·期 6
·5198-5208
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IF 3.277
Chunbo Liu,Guoling Wu,Jibin Chen,Kai Huang,Weidong Shi
In our study, a new visible light-driven photocatalyst SrTiO3/Fe2O3 was first prepared via a simple two-step process using a hydrothermal process and electrospinning technique. The photocatalysts, composed of Fe2O3 nanowires (about 200 nm in diameter), were modified with SrTiO3 nanocube (about 50 nm) photocatalysts based on photoinduced interfacial charge transfer (IFCT). The as-prepared SrTiO3/Fe2O3 photocatalysts exhibit enhanced photocatalytic activity in degrading tetracycline (TC) over their corresponding single component under visible light irradiation. The efficient photocatalytic performance of the composites could be ascribed to the enhancement in visible light absorption efficiency and the efficient electron transfer from the valence band of the SrTiO3 nanoparticles to the Fe2O3 nanowires. This study shows their potential application in purifying TC pollution in environmental wastewater because of their high efficiency and stability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yixuan Zhang,Cong Liu,Ye Zhou,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Hollow double-shelled Ag@SrTiO 3 -TiO 2 with Z-scheme heterostructure was constructed for highly efficient photocatalytic reduction of nitrate to N 2 . The 3D finite-difference-time-domain analysis indicated that hollow double-shelled structure improved light harvesting due to multiple reflections. Photo-generated electrons transfer from SrTiO 3 to Ag 0 caused by electron sink effect were utilized to reduce nitrate, while photo-generated electrons of TiO 2 migrated to SrTiO 3 via transport bridge of Ti 3+ defects for electron–hole recombination. Such charge carriers migration pathway facilitated the construction of Z-scheme heterostructure, which enhanced charge separation yet still retained high redox powers. Both photogenerated electrons and CO 2 − played important role in photocatalytic denitrification. Furthermore, Ag 0 acted as co-catalyst which not only promoted photogenerated electrons transfer to nitrate but also enhanced nitrate conversion selectivity to N 2 . Combining the above advantages, nitrate removal rate and the nitrogen selectivity reached 97.2 % and 98.8 % within 60 min, respectively. Even after five cycles, it still remained satisfied photocatalytic activity and stability. In summary, this work proposed a feasible strategy to construct Z-scheme hollow double-shelled photocatalyst for efficient photocatalytic denitrification.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Haolin Luo,Junie Jhon M. Vequizo,Zhen Ye,Feng Han,Jiasheng Chi,Jiawei Yan,Akira Yamakata,Wenfeng Shangguan,Zhi Jiang
Facet-engineered semiconductor single crystals hold considerable promise for applications ranging from solar fuels to photovoltaics. However, solid-state syntheses, though operationally simpler, typically fail at facet control due to limited atomic mobility, whereas solution/flux-based methods rely heavily on additives. Herein, we report a straightforward, self-directing solid-state ion doping strategy for synthesizing well-defined cuboidal rhodium-doped SrTiO 3 (SrTiO 3 :Rh) single-crystalline particles with predominant (1 0 0)/(0 1 0) facet exposure. This strategy is based on the identification of a previously unrecognized dual role of ionic Rh precursors as intrinsic structure-directing agents and visible-light sensitizers, facilitating concurrent crystal growth, facet stabilization and controlled doping incorporation during a single calcination step. Compared to Rh 2 O 3 -derived SrTiO 3 :Rh, a milestone photocatalyst historically suffered from poor facet control, these cuboidal crystals with anisotropic electronic surface structures exhibited enhanced crystallinity, superior charge separation efficiency and accelerated surface reaction kinetics, resulting in an order-of-magnitude improvement in visible-light-driven hydrogen evolution. Notably, when integrated into a liquid-phase Z-scheme system with BiVO 4 and Fe 3+ /Fe 2+ redox mediators, the SrTiO 3 :Rh single crystals exhibited a remarkable apparent quantum yield of 3.2 % at 420 nm for overall water splitting. This facile, self-directing synthetic approach addresses key challenges in traditional solid-state routes, providing valuable guidance for rational facet and doping engineering in diverse functional semiconductors for energy conversion.
研究领域:
材料科学
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光催化
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能量转换
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半导体工程
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太阳能燃料
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产品关联
DOI
高影响因子
RSC Advances
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2021
·Vol. 11
·期 22
·13624-13634
·
IF 3.361
Yadong Wang,Jinxin Ma,Nan Zhang,Delun Chen,Jinchun Tu,Yang Cao,Qiang Wu,Xiaolin Zhang,Wanjun Hao
Developing photoelectrochemical biosensors via efficient photogenerated-charge separation remains a challenging task in biomolecular detection. In this study, we utilised a simple approach for constructing an efficient photoactive organic–inorganic heterojunction interface composed of SrTiO3 with high photocatalytic activity and polydopamine (PDA) with high biocompatibility and electrical conductivity. Gold nanoparticles with dense electron cloud properties were introduced as a bridge between SrTiO3 and PDA (SrTiO3/Au/PDA). The Au bridge allowed the PDA to uniformly and tightly attach on the surface of SrTiO3 electrodes and also provided a separate transmission channel for electrons from PDA to SrTiO3. The rapidly transmitted electrons were captured by a signal-acquisition system, thereby improving the photocurrent signal output. The 3D hollowed out SrTiO3/Au/PDA biosensor manufactured herein was used for glucose detection. The biosensor achieved ultrahigh sensitivities reaching 23.7 μA mM−1 cm−2, an extended linear range (1–20 mM), and a low detection limit (0.012 mM). The excellent results of glucose analysis in serum samples further confirmed the feasibility of the biosensor in clinical applications. In summary, the proposed strategy allowed for the use of an electronic cloud bridge in the construction of glucose biosensors with satisfactory performances, which is promising for the future fabrication of high-performance biosensors.
研究领域:
材料科学
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生物化学
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分析化学
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生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
研究领域:
材料科学
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化学
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环境科学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tiandong Zhang,Shimin Sun,Chao Yin,Xinle Zhang,Changhai Zhang,Yue Zhang,Yongquan Zhang,Qingguo Chi
SrTiO 3 paraelectric materials exhibit significant potential to be used as lead-free energy storage dielectrics due to their distinctive linear-like polarization behavior. Nonetheless, the application in advanced thin-film capacitors is challenging due to their low polarization strength and structural anomalies, which reduce the breakdown field strength and diminish the energy storage density. This study proposes a synergistic approach that integrates ion doping with the optimization of thermal treatment to enhance the energy storage capabilities of SrTiO 3 thin films. Initially, Mn 2+ doping in SrTiO 3 films mitigates oxygen vacancies and forms Mn 2+ -V O •• defect dipoles, thereby refining the polarization behavior and reducing the leakage current density. Subsequently, the crystalline degree of SrTi 0.99 Mn 0.01 O 3 thin films can be regulated by adjusting the annealing temperature. The optimal breakdown field strength of the resultant SrTi 0.99 Mn 0.01 O 3 films reaches 4681 kV/cm with a 1 mol% Mn 2+ doping level, enhancing the recoverable energy storage density ( W rec ) to 32.17 J/cm 3 . Furthermore, the recoverable energy storage density of SrTi 0.99 Mn 0.01 O 3 films escalates to 36.62 J/cm 3 with an efficiency of 80.28 %, upon reducing the annealing temperature to 625 °C. Moreover, SrTi 0.99 Mn 0.01 O 3 films demonstrate superior thermal stability, frequency stability, and electrical fatigue resistance, underscoring their potential as efficacious materials for film capacitor applications.
研究领域:
材料科学
·
能量存储
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电介质材料
·
薄膜技术
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2023
·
IF 6.2
Xia Xu,Changchun Chen,Lingxiu Shu,Cheng Cheng,Zhonghai Tang,Yifeng Wang,Lin Pan,Zishen Guan
Water pollution can be efficiently treated by semiconductor photocatalysts under sunlight irradiation. In this study, novel S-scheme SrTiO 3 /ZnIn 2 S 4 composites were successfully fabricated via a facile oil-bath method. And the synthesized samples were then characterized by various characterization techniques together with Density Functional Theory (DFT) calculation. The X-Ray Diffraction(XRD)patterns show that SrTiO 3 /ZnIn 2 S 4 composites are composed of cubic perovskite structure SrTiO 3 and hexagonal phase ZnIn 2 S 4 . The High Resolution Transmission Electron Microscope(HRTEM)and Field Emission Scanning Electron Microscope (FESEM) images showed the intimate contacts between SrTiO 3 and ZnIn 2 S 4 are established to form the heterojunction. The photocatalytic activity of the composite was excellent when degrading organic pollutants, which outperformed that of pristine SrTiO 3 and ZnIn 2 S 4 . The prepared SrTiO 3 /ZnIn 2 S 4 -33% composite sample was proved to have the best photocatalytic activity, with 98 % degradation of organic pollutants under 32 min. The ·O 2 – is the main active reaction species for the degradation of organic pollutants, which was demonstrated by free radical trapping experiment. In addition, the mineralization of organic pollutants during the degradation process was analyzed by Total Organic Carbon (TOC) test. According to a series of experimental and theoretical calculations, the S-scheme heterojunction formed in the SrTiO 3 /ZnIn 2 S 4 composite is put forward for comprehending the photocatalytic degradation of organic pollutants and the formation of free radicals.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）