RENEWABLE ENERGY
·
2021
·
IF 8.001
Ying Li,Shengli Niu,Jun Wang,Wenbo Zhou,Yongzheng Wang,Kuihua Han,Chunmei Lu
A pure mesoporous SrTiO 3 with a honeycomb pore structure is synthesized by the sol-gel method and applied to catalyze transesterification of palm oil with methanol for the biodiesel production . The catalyst is characterized by XRD , CO 2 /NH 3 -TPD, N 2 adsorption-desorption, SEM-EDX, Raman and XPS to reveal its catalytic performances. The highest FAME yield of 93.14% is achieved in transesterification with the molar ratio of methanol to oil of 15:1 and catalyst concentration of 6 wt % at 170 C for 3 h. Besides, the catalyst is highly tolerant of FFAs and moisture, where the FAME yields of 83.80% and 86.50% are achieved even with the oleic acid and water addition of 10 wt % and 5 wt %. Meanwhile, the catalyst is found to be an effective catalyst for the simultaneous esterification and transesterification. The molecular simulation results show that the Ti sites are more easily attacked by FFAs and the Sr active sites are thus retained for the adsorption of methanol to catalyze transesterification, which explains the bifunctionality of the catalyst.
研究领域:
催化化学
·
材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 32
·1902101
·
IF 15.621
Yaping Zhang,Yang Li,Diqing Ni,Zhiwei Chen,Xiao Wang,Yuyu Bu,Jin-Ping Ao
In this work, a water splitting photoanode composed of a BiVO 4 thin film surface modified by the deposition of a rhodium (Rh)-doped SrTiO 3 perovskite is fabricated, and the Rh-doped SrTiO 3 outer layer exhibits special photoelectrochemical (PEC) oxygen evolution co-catalytic activity. Controlled intensity modulated photo-current spectroscopy, electrochemical impedance spectroscopy, and other electrochemical results indicate that the Rh on the perovskite provide an oxidation active site during the PEC water oxidation process by reducing the reaction energy barrier for water oxidation. Theoretical calculations indicate that the water oxidation reaction is more likely to occur on the (110) crystal plane of Rh-SrTiO 3 because the oxygen evolution reaction overpotential on the (110) crystal plane is reduced significantly. Therefore, the obtained BiVO 4 /Rh5%-SrTiO 3 photoanode exhibits an optimized PEC performance. In particular, it facilitates the saturation of the photocurrent density. Thus, the presence of doped Rh in SrTiO 3 can reduce the amount of noble metals required while achieving excellent and stable oxygen evolution properties.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
M. Ahmadi,M.S. Seyed Dorraji,M.H. Rasoulifard,A.R. Amani-Ghadim
Strontium titanate (SrTiO 3 ) with wide band gap, is only active under UV light irradiation and not under visible light. On the other hand, occupies about 3–5% of the solar spectrum falls in the UV range. Hence, modification of SrTiO 3 is necessary to improvement of the photocatalytic activity of it. In this work, coupling of SrTiO 3 (STO) on reduced Graphene Oxide (rGO) was studied for its enhanced photocatalytic activity under visible light irradiation. The enhanced activity can be partially attributed to the transfer of photoexcited electrons and holes in the STO/rGO semiconductor. Understanding the rGO/semiconductor interaction is of key importance for the design and synthesis of next generation photocatalytic materials for efficient photocatalytic activity and environmental clean-up applications. Hence, the separation mechanisms of photogenerated electrons and holes for STO/rGO semiconductor have been a research focus. Based on the experiment results, a possible mechanism of the photocatalysis over STO/rGO were investigated by photoluminescence technique (PL) and DRS analysis. Determining free radical ways in the presence of appropriate scavengers of oxidation to fit the experimental results was also further discussed. In this mechanism, the rGO acts as photosensitizer for wide band gap of STO semiconductor which can be photoexcited for generating electron and hole pairs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Yueming Zhu,Yuexiang Gao,Fei Yang
It is critical to effectively eliminate recalcitrant organic pollutants from wastewater. In this paper, the MoSe2/SrTiO3 (MST) catalysts were synthesized through simply controlling the amount of MoSe2 in the hydrothermal method to activate peroxymonosulfate (PMS) for the degradation of pollutants. The results demonstrated that sulfamethoxazole and tetracycline were almost eliminated by PMS/MST-3 (MoSe2/SrTiO3 mass ratio 0.3: 1) activation system. The effect of inorganic anions (Cl –, H2PO4 –, HCO3 –) and metal ions (Cu2+, Ni2+, Zn2+) commonly found in actual water bodies on catalytic reaction was explored. Moreover, SO4• –, •OH and 1O2 were identified by EPR tests and scavenger experiments, where the SO4• – and •OH were the dominant reactive species. The XPS analysis indicated that the oxygen vacancies and charge transfer on the catalyst surface were the keys of PMS activation. The effect of active sites in SMX and TC on the catalytic degradation activity was explored by density functional theory, and it was obtained that the central nitrogen site of SMX was more vulnerable in the catalytic system, while the edge oxygen site of TC was more susceptible to attack.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 26
·4772-4786
·
IF 3.756
Zhixin Ma,Yang Qi,Xiaoguo Bi,Xu-dong Liu,Xiaodong Li,Ji-guang Li,Xudong Sun
SrTiO3 has high thermoelectric properties and excellent high-temperature stability, which makes it a promising thermoelectric material for use in harsh environments. Hence, it has potential applications in power generation and sensors through direct conversion between heat and electricity. In this study, we investigated the crystal orientations on the crystal growth plane to seek the crystal orientation that is suitable for higher thermoelectric (TE) properties. The [510], [12 5 0] and [320] directions were selected which are on the (001) crystal plane and quarterly divide the angle between the [100] and [110] directions. Two common directions [100] and [110] were selected for comparison purposes. The SrTiO3 single crystals are annealed in carbon powders at 1573 K and 1673 K to form SrTiO3−δ. With the increase in annealing temperature, the electrical conductivity of SrTiO3−δ in the [510], [12 5 0] and [320] directions decreases, which is attributed to the decreasing carrier concentrations. This agrees well with the results calculated using the first-principles calculation. After annealing at 1573 K, the SrTiO3−δ single crystal exhibits the highest ZT value of 0.19 at 873 K in the [510] direction. However, the two common directions, [100] and [110], are not suitable for high thermoelectric properties. In particular, the SrTiO3−δ single crystal in the [12 5 0] direction can always exhibit higher PF and ZT values, regardless of the variation of the annealing temperature in carbon powders. The results of this study are imperative for the design and development of perovskite TE materials.
研究领域:
材料科学
·
热电材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuwen Han,Xinwei Li,Yan Tan,Yu Huang,Zhongbiao Wu,Meng Wang,Wingkei Ho,Shun-cheng Lee
In this work, novel heterostructured SrTiO 3 /SrCO 3 (STO/SCO) interface was constructed via the one-pot g-C 3 N 4 (CN) self-sacrificing hydrothermal strategy. The as-developed STO/SCO photocatalyst shows the air cleaning potential in continuous-flow reactors with degradation rates of NO and HCHO at 44 % and 40 %, respectively. From XRD, FTIR, and XPS analysis, CN participates in the crystallise process as the source of CO 3 2− to form the STO/SCO interface viewed by TEM and HRTEM. Subsequent temperature-programmed desorption (TPD) analysis and density functional theory (DFT) calculation results revealed the enhanced chemisorption effects of O 2 on the catalyst surface. The existence of oxygen vacancies combined with the formation of heterojunction surface induces intermediate levels, which leads to the photocatalytic oxidation under simulated solar light. Charge difference distribution simulation coupled with electrochemistry and photoluminescence tests confirmed the internal-built electron fields at the heterojunction interface which would be beneficial for photocarriers separation. Based on the above-mentioned effects, enhanced reactive oxygen species (ROS) OH and O 2 − were detected under light irradiation by electron spin resonance (ESR). This work demonstrates the effectiveness of in-situ self-sacrificed strategy for construction of heterojunction interfaces and provides opportunities by utilising insulator-based materials for photocatalytic degradation of air pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 39
·21046-21057
·
IF 11.9
Chuyu Wang,Yan Li,Xiaojiao Cai,Dongping Duan,Qibo Jia
As a typical perovskite-type crystal, strontium titanate (SrTiO3, STO) has remarkable photocatalytic activity and is broadly used in solar-driven overall water splitting. The research on controlling the synthesis of polyhedral STO with different exposures of crystal facets to obtain different optoelectronic properties has been greatly carried out in recent years. However, there are few reports of research on the construction of a nano step-shaped facet structure by the reconstruction of the STO crystal facet at a certain temperature, and the formation mechanism and composition analysis have not been explained clearly. In particular, the influence of crystal surface recombination on the hydrogen production reaction hasn't been thoroughly studied. This work presents the existence of a novel STO with the nano step-shaped facet structure parallel to (100) and (110) facets based on octadecahedron STO by a solid-state reaction, and the formation has been monitored by thermogravimetric analysis and in situ X-ray diffraction. In addition, more importantly, the step-shaped facet structure is rich in Sr, and lacks O and Ti, which is evidenced by EPR and XPS characterization, and it affects the transfer and separation of photo carriers. The complex STO catalysts were prepared by photodeposition of Rh, Cr, and Co to compare the hydrogen production capacity of overall water splitting. The novel step-shaped facet SrTiO3 has a good deposition effect on the cocatalysts, and the synthesized catalyst can effectively shorten the band gap to 1.92 eV and prolong the photogenerated carriers' lifetime to 3.7356 ns. Consequently, the novel SrTiO3 sample deposited co-catalysts achieve remarkable activity with the highest H2 evolution rate of 172.0 μmol h−1, which is 4.6 times higher than that of the original octadecahedron SrTiO3 prepared by the hydrothermal method. The DFT calculation results prove that the excellent photocatalytic performance is due to the lower work function and effective electron transfer of the SrTiO3 (100) crystal facet and Sr-rich (110) crystal facet, which is verified by the obvious electron transfer between the CrO42− and the two kinds of crystal facets.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xin Liu,Junzhe Jiang,Yushuai Jia,Jinmin Qiu,Tonglin Xia,Yuhong Zhang,Yuqin Li,Xiangshu Chen
The efficient treatment of dye wastewater has been a hot topic of environment field. The integration of adsorption and photocatalytic degradation via fabrication of bi-component heterojunction photocatalyst is considered as a facile and effective strategy to enhance the dye elimination efficiency. In this report, a Z-scheme heterojunction material, SrTiO 3 (La,Cr)/WO 3 with bifunction of adsorption and photocatalysis was successfully synthesized for efficient removal of methylene blue (MB) under visible light irradiation. The morphology and microstructure characterization demonstrates that the SrTiO 3 (La,Cr) nanoparticles are uniformly decorated on the WO 3 nanosheets, forming an intimate heterojunction interface. MB degradation results indicate that the removal efficiency by the synergistic adsorption-photocatalysis process is greatly improved compared to pure WO 3 and SrTiO 3 (La,Cr) with the adsorption and photocatalytic activity closely related to the composition of the material. The possible mechanism for the enhanced photocatalytic activity could be ascribed to the formation of a Z-scheme heterojunction system based on active species trapping experiments. Furthermore, the investigations of adsorption kinetics and isotherm show that the adsorption process follows pseudo-second-order kinetic model and Langmuir isotherm, respectively. Due to the synergistic advantages of negative zeta potential, large surface area and accelerated separation of photogenerated carriers driven by Z-scheme heterojunction, SrTiO 3 (La,Cr)/WO 3 exhibits excellent adsorption-photocatalytic performance and stability on MB removal, which could be potentially used for practical wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Liuen Wang,Yang Lu,Shuying Wang,Mengjia Li,Lan Zhang,Huizhong Ma
Tetracycline (TC) is a broad-spectrum antibiotic, and its introduction into the environment is known to cause serious water pollution issues and can result in the evolution of drug-resistant genes and superbugs. In this study, a new ZnTiO3–SrTiO3 double perovskite composite photocatalyst, synthesized using a simple molten salt method, was found to exhibit excellent performance in the photocatalytic degradation of TC in an aqueous solution under visible-light photoirradiation at λ = 420 nm. Individually, ZnTiO3 and SrTiO3 were identified as being inactive in the same reaction. However, the addition of Bi2O3 to the ZnTiO3–SrTiO3 composite (Bi2O3/ZnTiO3–SrTiO3) formed a dual-Z-scheme heterojunction, achieving 87.1% photocatalytic degradation rate of TC within 60 min. The obtained reaction rate constant (k = 0.03052 min–1) was 9.5 and 1.62 times higher than those achieved using the individual SrTiO3 (k = 0.00321 min–1) and ZnTiO3–SrTiO3 (k = 0.01882 min–1) species, respectively. Furthermore, a potential degradation pathway and mechanism for TC degradation using the Bi2O3/ZnTiO3–SrTiO3 composite photocatalyst was proposed. Overall, this approach provides a cost-effective and efficient method for preparing dual Z-scheme heterojunction photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Haibo Zhang,Yiwei Zhu,Zeyu Li,Penyuan Fan,Weigang Ma,Bing Xie
Nanocomposites combining high permittivity ferroelectric nanofillers and high breakdown strength polymer have shown tremendous potential for pulsed power applications. Nevertheless, the discharged energy density and efficiency of these nanocomposites filled with ferroelectric fillers are limited due to the large remanent polarization of ferroelectric fillers employed. Here, uniform elongated morphology paraelectric SrTiO 3 nanowires fillers were synthesized via a special stirring hydrothermal method . The fabricated P(VDF-CTFE)-based nanocomposites containing 3 vol% paraelectric SrTiO 3 nanowires exhibit an enhanced discharged energy density of 8.8 J/cm 3 at 3381 kV/cm, which exceeds most of the current reports at the same electric field. By direct comparison study with ferroelectric BaTiO 3 nanowires fillers, the results show paraelectric SrTiO 3 nanowires can simultaneously improve the discharged energy density and efficiency more effectively. Such enhancement in energy storage performance can be attributed to the following reasons: (I) The enhanced breakdown strength, which resulted from the reduced inhomogeneous electric fields via adopting the SrTiO 3 nanowires with lower permittivity. (II) The paraelectric phase SrTiO 3 nanowires show little hysteresis behavior compared to ferroelectric phase BaTiO 3 nanowires. This work is of critical significance in making advanced dielectric nanocomposites that are viable for energy storage devices in current electronic and electrical applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhenyu Cai,Jingjing Wang,Hao Fu,Yuehua Pan,Mingyue Ma,Yuqian Zhong,Yuxiang Deng,Yuezhou Wei,Toyohisa Fujita,Xinpeng Wang
The utilization of nuclear energy generates a substantial volume of wastewater containing uranium, posing a significant threat to both aquatic ecosystems and human health. The current photocatalytic materials utilized for uranium extraction commonly exhibit insufficient redox capabilities, inefficient separation of photogenerated carriers, and challenging recovery. Therefore, recyclable TiO 2 /SrTiO 3 /BiOBr (TSB) dual Z-scheme heterojunction fiber membrane materials with dual oxidation sites were successfully synthesized, with advantages of rapid carrier separation and transfer and a broad photo-response range of the dual Z-scheme heterojunctions. Due to the presence of dual oxidation sites, TSB exhibited an exceptional uranium extraction performance, achieving a remarkable 98.9 % extraction rate without the need for sacrificial agents, which was 2.48, 1.79, and 3.34 times of those of ordinary TiO 2 , SrTiO 3 , and BiOBr, respectively. The extraction rate of uranium from TSB was 85 % after five cycles. Optical and photoelectric tests revealed that TSB reduced the bandgap width by 0.25 eV compared to that of TiO 2 , enhanced the fluorescence lifetime by 1.3 ns, lowered the electrical resistance, and higher optical current density, confirming the effective charge transport at the catalyst interfaces. The charge transfer routes in the TSB dual Z-scheme were confirmed by X-ray photoelectron spectroscopy and density functional theory. The potent oxidizing ·OH generated by TSB played a crucial role in facilitating the conversion of U(VI) into insoluble (UO 2 )O 2 ·2H 2 O. In conclusion, this work provides a novel strategy for the design of dual Z-scheme heterojunctions and offers a new method for practical and recoverable uranium extraction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17417-17425
·
IF 7.443
Rui Tang,Longwei Yin
We present a novel Sr-doped TiO2/SrTiO3 nanorod array heterostructure for dye-sensitized solar cells (DSSCs) via a facile two-step hydrothermal process, with a tunable microstructure, optical response and photoelectrical conversion properties. The chemical composition components and microstructures of Sr-doped TiO2/SrTiO3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively. It is shown that the treatment of rutile TiO2 nanorod arrays in Sr(NO3)2 solution results in the self-doping of Sr into the lattice of TiO2 and formation of Sr-doped TiO2/SrTiO3 nanorod array heterostructures, inducing a transition of optical response properties from the ultraviolet region to the visible region. The photogenerated electrons and holes can be effectively separated due to the formation of SrTiO3/Sr-doped TiO2 heterostructures with a uniquely matched band-gap energy structure, resulting in greatly enhanced photoelectric conversion efficiency performance. Electrochemical impedance spectroscopy and photoluminescence results show that the formation of Sr-doped TiO2/SrTiO3 heterostructures can effectively prolong the charge carrier lifetime. The dye loading capacity on the Sr-doped TiO2/SrTiO3 heterostructures can be improved through the functionalization bonding of the hydroxide group on the surface of the electrode material. DSSCs based on the optimized Sr-doped TiO2/SrTiO3 heterostructure photoanode achieve the highest energy conversion efficiency of 4.70% (one sun illumination), nearly 1.5 times higher than the bare rutile TiO2 photoanode (3.10%).
研究领域:
材料科学
·
能源科学
✓ 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）