CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kangchuang Li,Hua Hao,Zhonghua Yao,Minghe Cao,Hanxing Liu
Sr(Nb 0.5 Ga 0.5 ) x Ti 1-x O 3 (x = 1 %, 2 %, 3 %, 5 %) (STNG) ceramics were synthesized in nitrogen atmosphere by a solid state method. All samples exhibited a cubic perovskite structure without secondary phase. With the increase of the co-doped concentration of Nb 5+ and Ga 3+ , the grain sizes increased firstly and then decreased. The STNG ceramic with x = 3 % exhibited a colossal permittivity (CP) of 24502 and a low dielectric loss of 0.012 at 1kHz and room temperature. Compared with those samples sintered in air, the samples sintered in nitrogen atmosphere have a higher dielectric constant with lower dielectric loss. The phase structure, surface morphology, element distribution, element valence states and dielectric properties of STNG ceramics were investigated. And the mechanism of colossal permittivity was also explored, which indicated that the CP could be attributed to the formation of [ T i 4 + • e − V O • • − e • T i 4 + ] defect dipole.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhiqiang Zhang,Ruijie Chen,Lei Wang,Xueru Chen,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic reduction of CO 2 to methanol over SrTiO 3 (ST) perovskite oxide is considered as a promising method to alleviate environment and energy problems at the same time. Meanwhile, the inducing of Cu plays an important role in photocatalytic activity and selectivity. Herein, a series of SrTi 1-x Cu x O 3 -H 2 (STCu x -H, x = 0.04, 0.06, 0.08, and 0.1) nanofiber catalysts were prepared by electrospinning combined with in-situ dissolution strategy. Cu x O dissolved in situ on a one-dimensional nanofiber structure could realize more active sites exposed and convenient directional movement of electrons, simultaneously. The unique structure facilitates the enhancement of photocatalytic activity and the improvement of selectivity. The methanol yield of STCu 0.08 -H nanofiber catalyst upped to 5.38 ± 0.19 μmol·g −1 ·h −1 , which was twice that of ST. Moreover, the photocatalytic activity did not decrease significantly after four times of reuse. The characterization further demonstrated that STCu 0.08 -H had stronger light response ability and faster electron transfer ability than ST under the synergistic action of Cu 2+ and Cu + . STCu 0.08 -H had superior CO 2 adsorption, activation ability, and electronic reduction capability by DFT calculation. This study provided a new idea about the design of perovskite oxide nanofiber for photocatalytic CO 2 reduction.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Xianwen Zhang,Zheng Li,Bin Zeng,Can Li,Hongxian Han
Understanding the processes of charge generation, transfer and capture is important for the design and synthesis of efficient photocatalysts. In this work, light-induced charge separation and effect of O 2 on electron transfer processes in SrTiO 3 were investigated by electron paramagnetic resonance (EPR). It was found that photoinduced electron transfer from O 2− to Ti 4+ produced Ti 3+ and O − redox radical pairs under vacuum condition. Under oxygen atmosphere, however, surface bound superoxide radicals O 2 − were formed by electron reduction of adsorbed oxygen at initial photoirradiation stage, and quenched by the reverse electron transfer to Ti 4+ upon further photoirradiation. Formation of long-lived charge separation associated [Ti 3+ ---O − ] species and the reversibility of surface bound superoxide radicals mediating the processes of photogenerated electrons may be accountable for the high activity of SrTiO 3 in photocatalytic water splitting reaction.
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Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·671-685
·
IF 5.819
Juan Cui,Jianghui Liu,Xunfeng Xia,Xu Chai,Huahua Guo,Jianfeng Gao,Shengwang Gao
A porous carbon quantum dots (CQDs)–SrTiO3/graphene material (CSG) was synthesized using a novel sol–gel carbonized propagation method (SCPM). In this method, the prepared gel was first immersed in an organic solvent with low-temperature self-propagating properties, and after being ignited, the product is obtained through carbonized propagation processes. Various characterization studies showed that CQDs, SrTiO3 and graphene can be combined through the SCPM, and CQDs and SrTiO3 form a heterojunction on the surface of the material, which is conducive to the recovery of the photocatalyst and improvement of the photocatalytic performance. The existence of a reducing atmosphere resulted in the occurrence of the doping process of CQDs. Photocatalytic degradation experiments showed that, with the increase of ethanol consumption, the catalytic performance tends to be stable. CSG-5, which consumes 80 mL of ethanol, has the best effect on MB degradation. When the dosage is 1.5 g L−1 and the concentration of MB is 5 mg L−1, the degradation rate is 94%. h+ and ˙O2− played a major role in the degradation system of CSG-5. UPLC-MS/MS results showed that 8 kinds of intermediates were produced during the degradation process. The special structure and preparation method of CSG-5 might help to prepare better photocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhiyuan Su,Fan Fang,Xue Li,Wenjun Han,Xianglei Liu,Kun Chang
SrTiO 3 as a photocatalytic overall water splitting material has received extensive attention in recent years, while effectively suppressing Ti 3+ is the key to enhancing the photocatalytic performance. Herein, a polymerizable complexation method is employed to enable Al 3+ uniformly enter into SrTiO 3 lattice for reducing Ti 3+ , and substituting Ti 4+ with the formation of oxygen vacancy. Thus, the photogenerated carrier transport is promoted, and the resulting appropriate surface oxygen vacancy is also conducive to the adsorption of water molecules and OH*. The optimized 2% Al 3+ -doped SrTiO 3 possesses a lower Ti 3+ concentration, compared with the same sample prepared by the solid-phase griding method. Consequently, 2% Al-STO sample deposited co-catalysts achieves the highest activity and durability with the H 2 and O 2 evolution rates of 1.256 mmol·h −1 and 0.692 mmol·h −1 (0.04 g catalyst), respectively, corresponding to the AQE value of 55.46% at 365 nm. The characterizations and DFT calculation results reveal that the uniform Al 3+ doping promotes the increase in the surface oxygen vacancy, which is beneficial for accelerating the reduction reaction and facilitating carrier separation and migration, therefore enhancing the overall water splitting reaction.
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PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 20
·205604
·
IF 3.551
Lun Zhang,Juanjuan Yin,Kuo Wei,Bingfan Li,Tifeng Jiao,Yan Chen,Jingxin Zhou,Qiuming Peng
The construction of low-cost, high-performance electrocatalysts instead of platinum catalysts is critical to solving the energy crisis. Here, using simple electrospinning and hydrothermal methods, new MoS2 nanosheets on SrTiO3 nanofibers (NFs) and 2D SrTiO3@MoS2 heterostructure NFs are synthesized. In addition, SrTiO3@MoS2 heterostructure NFs are compared with bare SrTiO3 NFs and MoS2 nanosheets. Importantly, the prepared SrTiO3@MoS2 heterostructure shows better hydrogen-evolution reaction performance than other MoS2-based electrocatalysts with an overpotential of 165 mV at 10 mA cm−2, a Tafel slope of 81.41 mV dec−1, and long-term electrochemical durability of 3000 cycles. Therefore, the present work strongly demonstrates the positive synergy between SrTiO3 NFs and layered MoS2, and also provides a strategy for preparing low-cost and high-activity water-decomposition electrocatalysts.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
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IF 2.843
Jiejing Kong,Zebao Rui,Hongbing Ji
Construction of versatile multijunctions with visible light response, effective charges transport and separation, suitable band positions, and good stability is highly expected for the photocatalytic VOCs degradation. Herein, one-dimensional titania nanotube supported SrTiO3 heterostructure (STO/TN) was developed by a hydrothermal process and then simultaneously sensitized with carbon nitride polymer (CN) and doped with nitrogen (CN-STO/TN) for photocatalytic mineralization of toluene. CN-STO/TN simultaneously exhibits the following advantages: (1) the nanotube structure enhances light-harvesting, enables effective charges transport and separation, retains sufficient energy of the charges, facilitates the pollutant species transport and reactants enrichment by the confinement effect; (2) synergistic effect of CN sensitization and N-doping extends the light response to the visible light region; (3) multichannel charges separation and transport among the multijunctions promote the photogenerated carriers separation. These beneficial factors lead to the remarkably higher visible light photocatalytic performance of CN-STO/TN in comparison with the component photocatalysts, 27 times that of TN, 13.5 times that of STO, and 4.9 times that of CN, respectively. These results demonstrate that the combination of morphology tailoring and energy band alignment manipulation is important in designing effective heterojunctions for photocatalytic applications.
研究领域:
材料科学
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环境科学
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化学工程
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ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202402217
·
IF 1.9
Xiaowei Liu,Mengnan Ruan,Bo Li,Weixue Cao,Yuxin Sun,Ke Ruan,Zhifeng Liu
In order to obtain high dielectric properties nitrile rubber (NBR) dielectric elastomer composites, in this work, polypyrrole (PPy) was encapsulated on the surface of SrTiO 3 (STO) ceramic particles, and an insulating layer of poly (catechol/polyamine) (PCPA) was also covered on the outer surface of the STO-PPy core-shell particles (denoted as STO-PPy-PCPA particles), then the dielectric elastomer composites were prepared by adding STO and STO-PPy-PCPA to NBR, respectively. Due to the electrical conductivity of PPy, the dielectric constant of the STO-PPy-PCPA particles increases substantially. At the same time, the insulating layer of PCPA further prevents current leakage from the composite, which not only avoids premature electrical breakdown but also effectively reduces the dielectric loss. Compared with pure NBR, the dielectric constant of the prepared dielectric elastomer composites increased from 13 to 17.19 (20 phr STO-PPy-PCPA/NBR), and the actuated strain increased from 3.28 % to 13.86 % (5 phr STO-PPy-PCPA/NBR), which is 4.2 times that of pure NBR. This work successfully solves the current problems of requiring a large amount of ceramics to improve the dielectric constant and the tendency of conductive particles to agglomerate and premature breakdown. Graphical In this work, high performance NBR dielectric elastomer composites are obtained by synthesising the core-shell structure STO-PPy-PCPA and the actuated strain is enhanced from 3.28 % (pure NBR) to 13.86 (5 phr STO-PPy-PCPA/NBR).
研究领域:
材料科学
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聚合物复合材料
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介电与绝缘
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智能材料
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机电致动器
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jinxing Yu,Lei Zhang,Jun Qian,Zhirong Zhu,Shuang Ni,Gang Liu,Xiaoxiang Xu
Starting from two wide band gap semiconductors AgTaO 3 and SrTiO 3 , we managed to reduce the band gap by forming their solid solutions, i.e. (AgTaO 3 ) 1-x (SrTiO 3 ) x (0.0 ≤ x ≤ 1.0). These solid solutions all adopt cubic perovskite structure similar to SrTiO 3 and high temperature phase of AgTaO 3 , suggesting that SrTiO 3 is helpful to stabilize AgTaO 3 in its high temperature cubic phase. Substantial improvements over photocatalytic hydrogen production were realized in these solid solutions which clearly outperform their parent compounds AgTaO 3 and SrTiO 3 . In-situ exolution of silver nanoparticles at the surface of solid solutions (x = 0.2) substantially strengthen the visible light absorption due to localized surface plasmons of these silver nanoparticles . This contributes to further improvements on both photocatalytic hydrogen and oxygen production under visible light illumination (λ ≥ 400 nm). Apparent quantum efficiency as high as ˜ 2.02% and ˜ 0.11% was achieved at solid solutions (x = 0.2) decorated with silver nanoparticles for full range (λ ≥ 250 nm) and visible light (λ ≥ 400 nm) illumination respectively. Photoelectrochemical analysis suggests that solid solutions own a better charge separation conditions than their parent compounds. Furthermore, the band edge positions of solid solutions (x = 0.2) lie approximately in the middle between AgTaO 3 and SrTiO 3 , being ideal for solar water splitting reactions.
研究领域:
材料科学
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光催化
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能源化学
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半导体物理
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纳米材料
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Xiaoyan He,Yanling Liang,Xiaosu Cheng,Hui Fan,Zhentong Zhu,Yuxuan Zhang,Yihao Guo,Jing Li,Yuanyuan Lu,Zhiqiang Wang,Xiaoquan Lu
PPy/SrTiO 3 -Bi composites let biomass hydrogel evaporators combine photothermal conversion with photocatalytic degradation. • Adsorption interception coupled with photocatalytic degradation gives the evaporator excellent VOC removal efficiency. • The evaporator achieves a VOC removal efficiency of up to 99.3% under one-sun irradiation. • Under the same illumination condition, a high-water evaporation rate of 3.13 kg m −2 h −1 is also obtained. • This evaporator exhibits excellent salt resistance and water purification capabilities. Solar-driven interfacial evaporation technology has become an important approach to addressing the global water crisis due to its advantages such as being green and sustainable. However, due to the inherent volatility of volatile organic compounds (VOCs), the technology still faces severe challenges in removing VOCs from distilled water. In this paper, a biomass-based hydrogel evaporator (PSBH) integrating solar steam generation and photocatalytic degradation was constructed by immobilizing polypyrrole (PPy)-coated SrTiO 3 -Bi composites into an acrylamide (AM)/Kapok fibres composite hydrogel network via a one-pot method. This evaporator can effectively remove phenol (a typical VOC) that is volatilized along with water vapor, while achieving efficient solar-powered water evaporation. The introduction of kapok fibres endows AM hydrogels with superior structural stability and water transport efficiency, while reducing the energy required for the evaporation process, thereby enhancing the overall water transport and evaporation performance. PPy-coated SrTiO 3 -Bi composites achieve photothermal-photocatalytic synergy. The introduction of semimetal Bi nanoparticles enhances visible-light absorption and promotes spatial charge separation through its dual functional role as an electron trap and a plasmonic hot-electron donor, imparting excellent photocatalytic activity and photothermal conversion efficiency. Under 1 sun illumination, the interfacial evaporation rate can reach 3.13 kg m −2 h −1 . Meanwhile, the removal efficiency of a typical VOC (phenol) reaches 99.3%, enabling the simultaneous achievement of highly efficient seawater desalination and VOC removal. It is worth noting that the evaporation rate of this evaporator can still reach 2.22 kg m −2 h −1 in 20 wt% salt solution concentration, showing excellent environmental tolerance. This design offers a feasible strategy for multifunctional photothermal materials and a novel solution to VOCs pollution in solar interfacial evaporation. Download: Download high-res image (209KB) Download: Download full-size image
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zhidong Wei,Jiawei Yan,Yuchen Zhang,Jiasheng Chi,Huoshuai Huang,Junying Liu,Jianli Mi,Linlin Ma,Wenjian Fang,Wenfeng Shangguan,Zhen Huang
Modulation of the built-in electric field was one of the effective strategies to enhance the separation of photogenerated carriers. Herein, corner-cut nano-cubic Al: SrTiO 3 was synthesized via the stoichiometric SrCl 2 molten salt regulation strategy. Notably, a rare phenomenon of stacking fault effect in SrTiO 3 , induced by Al 2 O 3 phase transition doping, was discovered. This phenomenon could serve as an effective approach for modulating the built-in electric field within Al:SrTiO 3 , and the photocarrier lifetime could be prolonged to exceed 2500 ps after investigated by the femtosecond ultrafast spectroscopy, which could be ascribed to the hole capture by Al 3+ through TiO 6 polarizability regulation. Consequently, compared to samples without stacking fault effect, the optimized Al: SrTiO 3 photocatalysts demonstrated an enhanced STH efficiency increasing from 0.15 % to 0.5 %. This work revealed the phenomenon of stacking fault effect in nano-photocatalysts and proposed insights into the mechanisms of the built-in electric field regulation through microstructure polarization.
研究领域:
材料科学
·
光催化
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lijun Xue,Jie Zhang,Chenhui Qiu,Hui Wan,Guofeng Guan
The incorporation of Cu-species, leveraging their variable valence states, represents a promising strategy for enhancing photocatalytic CO2 reduction. However, the underlying mechanism through which multivalent Cu-species facilitate this process remains inadequately elucidated, motivating further investigation. Herein, multivalent copper-modified SrTiO3 nanofibers (CuxO/STO-Y) were synthesized via an electrospinning method combined with a glucose-assisted hydrothermal process. The optimized CuxO/STO-2 nanofiber photocatalyst demonstrated a CO2 photoreduction rate to CH3OH of 7.26 μmol g−1 h−1. According to the characterization results, loading CuxO species onto the SrTiO3 nanofiber surface can broaden the light-responsive range, further improving the separation efficiency of electrons and holes. The density functional theory (DFT) calculations revealed that photogenerated electrons from SrTiO3 preferentially migrated and accumulated on CuxO sites, thereby prolonging charge carrier lifetimes and ultimately improving the CO2 photoreduction efficiency. This work highlights the crucial role of valent-engineered Cu-species in enhancing the performance of photocatalysts.
研究领域:
光催化
·
材料科学
·
环境化学
·
能量转换
·
纳米材料
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危险品化学品经营许可证（带存储）