CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 25
·7300-7306
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IF 5.236
Jingyi Cai,Haoshan Wei,Yong Zhang,Rui Cai,Xueru Zhang,Yan Wang,Jiaqin Liu,Hark Hoe Tan,Ting Xie,Yucheng Wu
Graphical A novel photocatalyst is designed with consideration of heterojunction band matching and porous structure. The SrTiO 3 /SrSO 4 heterojunction using Pt as the co-catalyst reaches 396.82 μmol g −1 h −1 , which is 16 times higher than that of SrTiO 3 /Pt. It is proposed that the presence of SrSO 4 provides extra channels for electron transportation as well as promoting photocatalytic activity. Efficient separation of photogenerated electron–hole pairs is a crucial factor for high-performance photocatalysts. Effective electron–hole separation and migration could be achieved by heterojunctions with suitable band structures. Herein, a porous SrTiO 3 /SrSO 4 heterojunction is prepared by a sol-gel method at room temperature followed by an annealing process. XRD characterization suggests high crystallinity of the heterostructure. A well-defined interface between the two phases is confirmed by high-resolution (HR)TEM. The photocatalytic H 2 evolution productivity of the SrTiO 3 /SrSO 4 heterojunction with Pt as co-catalyst reaches 396.82 μmol g −1 h −1 , which is 16 times higher than that of SrTiO 3 /Pt. The boosted photocatalytic activity of SrTiO 3 /SrSO 4 /Pt can be ascribed to the presence of SrSO 4 , which promotes the transfer and migration of photogenerated carriers by forming the heterojunction and porous structure, which provides a large amount of active sites. This novel porous heterostructure brings new ideas for the development of high-efficiency photocatalysts for H 2 release.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Shan Gao,Haidong Yu,Peng Yang,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Composites consisting of two nano-or molecular-scale components tend to exhibit newer properties or characterizations compared to the matrix material. However, they are extremely limited in thermoelectricity due to the difficulty of achieving an extremely homogeneous distribution of the material on such a small scale. In this paper, we successfully prepared a series of composite thermoelectric materials of Sr 0.9 La 0.1 Ti 0.85 Nb 0.15 O 3 /carbon nanotubes (CNTs, with contents of 0.5, 1.5, 2.5, and 5.0 wt%). Highly homogeneous dispersion of CNTs was observed in the strontium titanate oxide (SrTiO 3 ) matrix prepared via high-temperature and high-pressure (HPHT) synthesis due to the interaction between SrTiO 3 and multi-walled CNTs. The experimental results showed that CNTs were uniformly dispersed in the composite powders synthesized using the HPHT method. Meanwhile, the electrical conductivity increased linearly with the increase in the CNTs content. The power factor reached 684 μWm −1 K −2 at 973K with 2.5 wt% CNTs composite concentration. This considerable enhancement is attributed to the increase in the charge carrier concentration as well as the higher electron mobility. In addition, the lattice thermal conductivity was suppressed due to enhanced Umklapp scattering. This ultimately leads to a thermoelectric figure of merit, zT , of 0.33 at 973 K. This work opens a new window on the thermoelectric properties of nanocomposite SrTiO 3 -based thermoelectric materials.
研究领域:
材料科学
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热电学
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Renke Bi,Bing Han,Yijie Shen,Jialong Liu,Zhiyu Wang
Sunlight-driven photocatalytic overall water splitting (OWS) is a promising approach for solar-to-chemical energy conversion. However, its realization with a single photocatalyst by one-step excitation has been extremely limited due to the rapid recombination of photogenerated charges, slow surface redox kinetics, and undesired reverse reactions. Herein, we sought to enhance the OWS performance of SrTiO3 (STO) by exploring the synergistic effects of different kinds of metal/oxide dual cocatalysts. The results show that the Pt/CrOx-STO system had a superior activity, which achieved stoichiometric water splitting with H2/O2 evolution of 1814.17/1020.47 μmol g–1 h–1 under simulated sunlight, without using any sacrificial reagents. The enhanced efficiency can be attributed to the improved interfacial transport of photogenerated charges and the boosted surface kinetics. Importantly, the CrOx layer served as a selective membrane that prevented the O2 diffusion and facilitated H+ transport, while partially covering the highly active site of Pt nanoparticles, thus significantly inhibiting the reverse recombination reaction of H2 and O2. In particular, this dual catalyst system emphasized a low dependence on the properties of the substrate material and is therefore widely applicable and economical. This work demonstrated the potential of the Pt/CrOx dual cocatalyst modification strategy for optimizing photocatalytic OWS, providing a pathway toward selective and sustainable conversion of H2O to H2 and O2.
研究领域:
材料科学
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可再生能源
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
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2021
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IF 3.314
Beilei Yuan,Haoming Wei,Jingwei Li,Yu Zhou,Fan Xu,Jinkai Li,Bingqiang Cao
In this paper, inorganic halide perovskite cesium lead bromide (CsPbBr3) films are epitaxially grown on (100)-oriented SrTiO3 substrates by pulsed laser deposition (PLD). This method has the distinctive advantages to grow high-quality films with a precise composition, designed crystalline orientation, and controlled uniform thickness. By optimizing the substrate temperatures and laser pulse numbers, (100)-CsPbBr3 films with uniform morphology are grown on a SrTiO3 substrate via a cubic-on-cubic epitaxial growth mode, which is proven by XRD investigation. Detailed photophysical spectroscopy study including femtosecond transient absorption spectra and detailed low-temperature photoluminescence spectra indicate that such epitaxial CsPbBr3 films are of very low defects in the bandgap. The temperature-dependent resistivity measurement reveals that the epitaxial CsPbBr3 films show a typical thermally activated carrier behavior with a bandgap value of 2.37 eV, which is very consistent with the optical result and indicates a quasi-intrinsic semiconductor nature of such an epitaxial film. Our results confirm that CsPbBr3 films with high crystal quality and lower defect density can be epitaxially grown with PLD for further superlattices and quantum wells.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shenyu Lan,Chuan Yu,Yawen Peng,Xiaonan Hu,Wei Yan,Xiang Cui,Mingshan Zhu,Chunyang Zhai
Piezo-modulated interface engineering is an effective method for tuning the charge transfer process to enhance piezocatalytic dynamics. In this study, SrTiO 3 /ZnO heterojunctions were successfully synthesized via hydrothermal methods to degrade carbamazepine in water. The optimal SrTiO 3 /ZnO-5 % sample exhibited a remarkable 99.9 % degradation efficiency of carbamazepine within 60 min under ultrasonic vibration. The piezocatalytic reaction rate ( k value = 0.0746 min −1 ) was 4.63 times and 10.97 times higher than that of pure SrTiO 3 and pure ZnO, respectively. Reactive species scavenger tests, electron paramagnetic resonance techniques, and bands gap analysis revealed that the enhanced activity can be attributed to the construction of an interfacial electric field in SrTiO 3 /ZnO heterojunctions and the modification of an internal piezoelectric polarized field. This allowed charge redistribution and transport across the SrTiO 3 /ZnO heterojunction interface, and facilitated the generation of hydroxyl radicals (HO • ) through simultaneous hole oxidation and electron reduction. This study provides a comprehensive mechanistic understanding about piezoelectric heterojunctions in the catalytic redox reactions, and offers valuable insights for designing more effective piezoelectric heterojunctions for the degradation of pharmaceutical organic pollutants.
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
APPLIED CATALYSIS A-GENERAL
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2019
·
IF 4.63
Tingting Xu,Shulan Wang,Li Li,Xuan Liu
Semiconductor photocatalysis is considered as an effective sustainable technology to relieve the emerging global energy shortage issues, while how to design the efficient photocatalyst with enhanced light absorption, charge carrier separation and surface reaction is still a primary barrier for its applications. Herein, SrTiO 3 /TiO 2 /C (STC) heterostructure with tri-modal (micro-, meso-, macro-) pores integrated was synthesized via freeze casting combined with silica colloid as the hard template. Carbon was used as the photosensitizer for extending light absorption, electric field from SrTiO 3 /TiO 2 for enhancing charge carrier separation, and hierarchical pore structures for promoting surface reaction. Silica in different particle sizes was used to tune the pore structure of composites. The as-prepared STC sample reached the photocatalytic hydrogen production rate from water splitting as high as 2.52 mmol h −1 g −1 under UV irradiation, which is 1.5 times of benchmark catalyst P25. Its reactivity for methylene blue (MB) degradation is superior to the corresponding individual compositions and about 4.7 times of SrTiO 3 under UV light irradiation. The current work provides a feasible method to fabricate the hierarchical porous multi-component semiconductor based heterostructures with excellent photochemical performances, which develops our understanding for the design and fabrication of hierarchical porous catalysts.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2022
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IF 12.92
Xianwen Zhang,Zheng Li,Taifeng Liu,Mingrun Li,Chaobin Zeng,Hiroaki Matsumoto,Hongxian Han
When a proton reduction cocatalyst is loaded on an n-type semiconductor for photocatalytic overall water splitting (POWS), the location of water oxidation sites is generally considered at the surface of the semiconductor due to upward band-bending of n-type semiconductor which may ease the transfer of the photogenerated holes to the surface. However, this is not the case for Pt/SrTiO 3 , a model semiconductor based photocatalyst for POWS. It was found that the photogenerated holes are more readily accumulated at the interface between Pt cocatalyst and SrTiO 3 photocatalyst as probed by photo-oxidative deposition of PbO 2 , indicating that the water oxidation sites are located at the interface between Pt and SrTiO 3 . Electron paramagnetic resonance and scanning transmission electron microscope studies suggest that the interfacial oxygen atoms between Pt and SrTiO 3 in Pt/SrTiO 3 after POWS are more readily lost to form oxygen vacancies upon vacuum heat treatment, regardless of Pt loading by photodeposition or impregnation methods, which may serve as additional support for the location of the active sites for water oxidation at the interface. Density functional theory calculations also suggest that the oxygen evolution reaction more readily occurs at the interfacial sites with the lowest overpotential. These experimental and theoretical studies reveal that the more active sites for water oxidation are located at the interface between Pt and SrTiO 3 , rather than on the surface of SrTiO 3 . Hence, the tailor design and control of the interfacial properties are extremely important for the achievement or improvement of the POWS on cocatalyst loaded semiconductor photocatalyst.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2024
·Vol. 23
·期 9
·1659-1672
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IF 2.7
Zhang Lihua,Dong Guowen,Liu Xiaomin,Niu Yu,Gao Wei,Yang Qiong,Li Zaixing
The catalysts with three-dimensional porous (3DP) CeO 2 , LaFeO 3 and SrTiO 3 are synthesized by sol–gel method and chemical precipitation method. The resulting multi-component 3DP CeO 2 /LaFeO 3 /SrTiO 3 composite material featured a high specific surface area (26.08 m 2 /g), which can provide more surface active sites to improve adsorption capacity and catalytic performance. The photocatalytic, Fenton-like, photo-Fenton-like performance of the catalyst are studied on decolorization of RhB under UV irradiation, respectively. 3DP CeO 2 /LaFeO 3 /SrTiO 3 exhibits high catalytic performance. Compared with photocatalytic or Fenton-like performance, 3DP CeO 2 /LaFeO 3 /SrTiO 3 catalyst exhibits higher photo-Fenton-like performance, facilitating efficient decolorization of the rhodamine B. Moreover, the initial reaction rate on decolorization of RhB with 3DP CeO 2 /LaFeO 3 /SrTiO 3 is 10.55, 5.52, 3.67 and 1.51 times higher than that with SrTiO 3 , LaFeO 3 , 3DP CeO 2 and 3DP CeO 2 /LaFeO 3 , respectively. Meanwhile, 3DP LaFeO 3 /CeO 2 /SrTiO 3 has a wider pH usage range in the synergistic reaction. Finally, a catalytic mechanism for the decolorization of rhodamine B is proposed. The continuous cycling of Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ and the production of active substances are achieved under the photo-Fenton-like effect of the catalyst. Graphical abstract
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fang He,Dashuang Fu,Yunkai Wu,Xu Wang
Lead-free dielectric capacitors have become a topic of great interest in response to the ever-increasing demand for high-performance and environmentally friend energy devices. As SrTiO 3 (STO) is paraelectrics, the extremely low spontaneous polarization limits the development of its energy storage applications. In this paper, the microstructure and ferroelectric properties of STO are adjusted by grain engineering to expand its application in energy storage. STO, SrTi 1-x Mn x O 3 (STM x , x = 0.01 and 0.04) and Sr 1-y La y TiMn 0.01 O 3 (SL y TM 0.01 , y = 0.01, 0.02, 0.03 and 0.04) thin films are synthesized by the sol-gel method and thoroughly investigated on the effects of A-site (La) and B-site (Mn) co-doping effects on the crystalline phase, morphology, dielectric, ferroelectric and energy storage characteristics of STO thin film. The results indicate that the SL 0.01 TM 0.01 thin film exhibits a breakdown electric field of 3666.2 kV/cm. The SL 0.02 M 0.01 thin film exhibits excellent frequency stability and low dielectric loss (<0.01) with an energy storage density of 29.5 J/cm 3 and an efficiency of 83.7 % at 2600 kV/cm. Moreover, the sample shows good frequency stability (400–2800 Hz) and thermal stability (20−140 °C). These findings indicate the potential of (Mn, La) co-doped SrTiO 3 thin film for dielectric capacitor energy storage field applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 12
·7023-7036
·
IF 4.21
Zhou Man,Chen Jingwen,Jiang Mengting,Zhang Yakang,Liang Qian,Xu Song,Yao Chao,Li Zhongyu
A series of thickness-controlled SrTiO 3 (commonly abbreviated ST) anchored on carbonized bacterial cellulose (CBC) was successfully prepared by a novel route of freeze-drying assisted crystallization/carbonization. For the first time, the cross-linked bacterial cellulose served as a carbon source as well as structure-directing scaffold for the construction of ST/CBC composites. Characterizations exhibited cracks and defects on the surface of CBC which provided ideal anchoring sites for the dispersion and crystallization of ST. Additionally, the relationship between morphology and photocatalytic activity of ST/CBC was carefully investigated by photocatalytic reduction of potassium dichromate (K 2 Cr 2 O 7 ) and degradation of tetracycline in water. This unique biomass-derived carbon fibers provide an ideal platform for further design of perovskite based materials with enhanced catalytic performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2016
·Vol. 109
·期 9
·
IF 3.142
Yao Manwen,Peng Yong,Xiao Ruihua,Li Qiuxia,Yao Xi
SrTiO 3 /nano Al 2 O 3 inorganic nanocomposites were prepared by using a conventional sol-gel spin coating process. For comparison, SrTiO 3 films doped by equivalent amount of sol-Al 2 O 3 have also been investigated. Aluminum deposited by using vacuum evaporation was used as the top electrode. The nanocomposites exhibited a significantly enhanced dielectric strength of 506.9 MV/m, which was increased by 97.4% as compared with the SrTiO 3 films doped with sol-Al 2 O 3 . The leakage current maintained of the same order of microampere until the ultimate breakdown of the nanocomposites. The excellent electrical performances are ascribed to the anodic oxidation reaction in origin, which can repair the internal and/or surface defects of the films.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Zeming Gu,Qi Wang,Xiaoqin Sun,Lingwei Lu,Yuwei Zhang,Ran Wang,Shu Jin,Yinlin Shao,Jun Qian,Xiaoxiang Xu
P-type semiconductivity has been observed in solid solution series (SrTiO 3 ) 1- x (CaCr 0.5 Nb 0.5 O 3 ) x (0.0 ≤ x ≤ 0.15), which all adopt cubic symmetry and own intense absorption in the visible light region. These solid solutions are superior H 2 evolution photocatalysts under visible light illumination (λ ≥ 400 nm). An AQE as high as 1.02 % at 420 ± 20 nm has been achieved at optimal composition (SrTiO 3 ) 0.85 (CaCr 0.5 Nb 0.5 O 3 ) 0.15 which significantly surpasses the parent compounds. Stoichiometric H 2 /O 2 production under visible light illumination has been successfully realized using Z-scheme system containing (SrTiO 3 ) 0.85 (CaCr 0.5 Nb 0.5 O 3 ) 0.15 , WO 3 and I − /IO 3 − redox couple.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）