CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yong Peng,Manwen Yao,Xi Yao
SrTiO 3 -based films doped with different Al-precursors were prepared by sol-gel methods and the dielectric strengths and leakage currents of the materials were investigated. The best performance was found in SrTiO 3 films doped with Al 2 O 3 nanoparticles (nano-Al 2 O 3 ). When 5 mol% of nano-Al 2 O 3 was added to SrTiO 3 films with Al electrodes, the dielectric strength was enhanced to 506.9 MV/m compared with a value of 233.5 MV/m for SrTiO 3 films. The energy density of the 5 mol% nano-Al 2 O 3 doped SrTiO 3 films was 19.3 J/cm 3 , which was also far higher than that of the SrTiO 3 films (3.2 J/cm 3 ). These results were attributed to interfacial anodic oxidation reactions, which were experimentally confirmed by cross-sectional transmission electron microscope studies and theoretically modelled based on Faraday's laws . The films with added nano-Al 2 O 3 featured many conducting paths at the interfaces between the host phase and the guest nano-Al 2 O 3 , which promoted ion transport and contributed to the strong anodic oxidation reaction capability of the 5 mol% nano-Al 2 O 3 doped SrTiO 3 films.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 17
·2200383
·
IF 6.389
Chenxi Huang,Chen Chen,Wenyuan Wang,Jun Fu,Miaomiao Xiang,Yue Xing,Qi Chen,Hualing Zeng,Xiang Shao
The structure and morphology of the substrate surface play critical roles in tuning the properties of the supported two-dimension materials (2DM). In this work, a simple strategy to engineer the SrTiO 3 single crystal into a trenched structure which is composed of atomically flat terraces and high steps of several nanometers is developed. Through the conventional chemical vapor deposition method, high quality single-layered MoS 2 nanosheets are successfully fabricated directly on the trenched SrTiO 3 (Tr-STO) substrate, which thus result in a heterostructure with well-defined interface and controllable corrugated morphology. The corrugated MoS 2 /Tr-STO sample displays a drastically suppressed photoluminescence as compared to those grown on atomically flat substrates. Detailed scanning probe microscopy in combination with optical spectroscopy measurements demonstrates that the photoluminescence quenching occurs exclusively in the MoS 2 area carpeting the high SrTiO 3 steps, which can be attributed to the significantly reduced bandgaps hence massively enriched free charges in these regions. This work not only provides a new strategy to tailor the 2DM properties by simply engineering the substrate surface corrugations, but also brings deep insights into the dependence of properties of the hybridized system on the interface morphologies.
研究领域:
材料科学
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光学
·
表面科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Huaqiao Tan,Zhao Zhao,Wan-bin Zhu,Eric N. Coker,Binsong Li,Min Zheng,Weixing Yu,Hongyou Fan,Zaicheng Sun
A facile and general method has been developed to fabricate oxygen vacancies on perovskite SrTiO3 (STO) nanocrystals through a controllable solid-state reaction of NaBH4 and SrTiO3 nanocrystals. STO samples with tunable color, oxygen vacancy concentration on nanocrystal surface have been synthesized. TEM results reveal that these STO samples have a crystalline core/amorphous shell structure (SrTiO3@SrTiO3–x). XPS and EPR results disclose that the oxygen vacancy concentration increases with the increase of reaction time and temperature. The concentration of oxygen vacancies calculated from TGA data, could reach 5.07% (atom) in this study. UV–vis spectra and photocatalytic results indicate that oxygen vacancies on STO surface play an important role in influencing the light absorption and photocatalytic performance. However, an excess amount of oxygen vacancies leads to a decrease of photocatalytic performance. The optimal photocatalytic activity for H2 production under UV–vis irradiation is up to 2.2 mmol h–1 g–1, which is about 2.3 times than the original SrTiO3, corresponding to 3.28% (atom) of oxygen vacancy concentration.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
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能源材料
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yongmei Xia,Zuming He,Kejun Hu,Bin Tang,Jiangbin Su,Ya Liu,Xiaoping Li
In order to further improve the photocatalytic activity, Cu 2 O coupled with SrTiO 3 was for the first time constructed by introducing SrTiO 3 to Cu 2 O and synthesized via a two-step route. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction photocatalysts were systematically characterized by XRD , XPS , SEM, UV–vis spectra, etc., showing that n-SrTiO 3 /p-Cu 2 O composites were formed by coupling SrTiO 3 submicroparticles with Cu 2 O cubic micrometer structure. Photocatalytic results demonstrated that the introduction of SrTiO 3 brought about significant enhancement of photocatalytic activity of Cu 2 O, which led to the fact that SrTiO 3 could serve as cocatalyst for the degradation of pollutant MB by forming p-n heterojunction to accelerate photo-generated charge carriers separation and migration and providing enriched active sites. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction composites showed good stability and recyclability in the process of photo-degradation. Besides, the possible photocatalytic mechanism was proposed.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 34
·19279-19288
·
IF 2.936
Sai Wang,Xuewen Xu,Han Luo,Chaochao Cao,Xiaoyu Song,Jianling Zhao,Jun Zhang,Chengchun Tang
SrTiO3/NaTaO3 (STO/NTO) heterojunction photocatalysts were successfully constructed by decorating NaTaO3 nanocubes with SrTiO3 nanoparticles via a hydrothermal method. The structure of the perovskites NaTaO3 and SrTiO3 bear some resemblance to each other, which increases the interface lattice match for promoting the migration of photogenerated carriers between the STO/NTO interfaces. In comparison to pristine NaTaO3 and SrTiO3 samples, the STO/NTO composites exhibited remarkably improved capacity for the degradation of rhodamine B (RhB) under ultraviolet (UV) light (λ < 400 nm) irradiation. Furthermore, the partial replacement of O2− by N3− in the TaO 6 octahedron narrowed the band gap of NaTaO3, which significantly enhanced the photocatalytic performance of the SrTiO3/NaTaO3:N (STO/NTON) heterojunction under visible light (λ > 400 nm). Finally, the possible band structures of the STO/NTO and STO/NTON photocatalysts were proposed, which indicated that an n–n type heterojunction was constructed with a staggered gap for fast separation of photogenerated electron–hole pairs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenchao Lin,Pengrong Ren,Yuhui Wan,Shu Yang
BaTiO 3 , Ba(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , SrTiO 3 , Sr(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , (Sr 0.5 Ba 0.5 )TiO 3 and (Sr 0.5 Ba 0.5 )(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 ceramic samples were prepared using a traditional solid-state reaction method. XRD analysis shows that all the samples are a single-phase perovskite structure. After the addition of B-site high-entropy components Sn 4+ , Zr 4+ , Hf 4+ , and Nb 5+ in BaTiO 3 , the permittivity and dielectric loss decrease significantly, and the temperature stability of the permittivity is remarkably improved. Compared with the undoped sample, the insulation resistance of the high-entropy ceramic sample increases exponentially. The incorporation of high entropy components changes the conduction mechanism, improves the insulation performance, and significantly decreases thermal conductivity, which improves the adiabatic performance of ceramics. These results demonstrate that the high entropy strategy can significantly influence the electrical and thermal properties of BaTiO 3 and SrTiO 3 -based ceramics. Our work provides a new idea for the modification of functional ceramic materials and offers new promising candidates of dielectrics applied for Class-I type ceramic capacitors.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xuan Zhu,Yuan Gao,Jianan Hong,Entao Zhang,Yu Xie,Jia Mao,Chenyu Xu,Yanwei Zhang
The synergistic coupling of optical and thermal effects for the comprehensive utilization of solar energy has garnered increasing attention in recent research. In this work, the synergistic coupling of solar photo and thermal effects was realized using a non-noble metal Ni cocatalyst loaded with Mg and Al codoped SrTiO 3 . In the photothermal synergistic decomposition of pure water, the efficiencies of H 2 and O 2 reached 1.011 mmol·g −1 ·h −1 and 0.497 mmol·g −1 ·h −1 , respectively. The hydrogen yield was almost 2.7 times higher than that of pure photocatalysis. It was found that the introduction of NiOOH significantly enhanced the separation and migration of photogenerated carriers, along with the significant thermal effect. A series of variable temperature characterizations confirm that the thermal effect in sunlight can enhance light absorption and reduce the carrier transport impedance of material, which significantly improves carrier utilization and further promotes hydrogen generation. This study provides an effective idea for the design of solar non-noble metal catalysts for hydrogen production by utilizing the photothermal synergy strategy.
研究领域:
材料科学
·
能源化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70041
·
IF 0
Yanzhi Zheng,Yu Sun,Zihan Yang,Yuqing Liu,Xiaotong Sun,Lixia Li,Wanning Cao,Jingkai Yang
There are still challenges to eliminate and reduce the harmful persistent organic pollutants (POPs) in the water, especially the dye-based POPs. Two big obstacles the Ag 3 PO 4 photocatalyst faces are serious carrier recombination and photocorrosion, which presents a limitation for its application in water purification. Therefore, in this work, a novel Ag 3 PO 4 /SrTiO 3 heterojunction was synthesized by a simple in situ deposition method. Ag 3 PO 4 /SrTiO 3 10:1 exhibits the highest photocatalytic activity with rhodamine B (RhB) degradation of 98.8% in only 20 min and methyl orange (MO) degradation of 97.5% in 80 min under simulated sunlight irradiation, which is much higher than that of pure Ag 3 PO 4 and the mixed photocatalysts. During the photocatalytic reaction, h + and •O 2 − are the main active species, and the charge transfer path is satisfied with the Z-scheme mechanism. Additionally, the possible degradation pathways of RhB and MO were proposed by analyzing the intermediate products via HPLC-MS.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
Materials Today Physics
·
2024
·
IF 10
Yulong Qiao,Mengyang Wang,Hewei Ding,Jin Li,Junmei Zhang,Guiguang Qi,Xiongbo Yang,Xinyu Tan
When using high-power devices outdoors, especially in sunny summers, power losses coupled with direct sunlight can cause devices to overheat. This overheating not only disrupts their normal functioning but also increases the risk of fire accidents. To address this issue, the flexible polyvinylidene fluoride (PVDF)/strontium titanate (SrTiO 3 , denoted as ST) composite films (abbreviated as P-S-x where x represents the mass ratio of PVDF to ST, x = 0.5, 1, 1.5, 1.75) were developed through a simple mixing method. Outdoor Radiant Cooling tests demonstrate that the P-S-1.75 sample exhibits an average cooling effect ∼14.2 °C compared with pure PVDF sample and an average cooling effect ∼20.2 °C compared with a bare Al sample. The P-S-1.75 sample with a thickness of 115 μm achieves exceptional performance in the broadband mid-infrared range from 2.5 to 25 μm with an average emissivity reaching about 97 %. And the max reflectance of P-S-1.75 sample reaches 90 % in the range of 0.5–2.0 μm. Furthermore, P-S-1.75 sample obtains a thermal conductivity ∼1.97 W/(m·K) which is about ten times higher than that of pure PVDF (0.2 W/(m·K)), and a cooling effect of 11.7 °C on the ceramic heating plate was obtained. The outstanding cooling performance exhibited by P-S-1.75 coating can be attributed to its exceptional radiative cooling capacity and high thermal conductivity. This work provides a new idea to obtain polymer/ceramic composite materials with excellent radiative cooling performance in cooling applications.
研究领域:
材料科学
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能源工程
·
热管理技术
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5595-5600
·
IF 3.545
Ji Ping Zhu,Xue Feng Wu,Xiao Hua Yang,Peng Fei Liu,Sheng Dai,Hua Gui Yang
Mesoporous single crystals have attracted considerable attention owing to their wide applications in (photo)catalysis, photovoltaics, and numerous other electrical energy conversion and storage technologies. Here, by using low-valent Ti3+ precursors, we have successfully synthesized well-defined mesoporous single-crystal strontium titanate (MSC SrTiO3) without a template via a facile hydrothermal method. The BET surface area and average pore diameter of MSC SrTiO3 are 18.6 m2 g−1 and 22 nm, respectively. Moreover, the as-synthesized MSC SrTiO3 features abundant oxygen vacancies. By using time-dependent structural and morphological characterizations, a hypothetical crystal growth mechanism was proposed.
研究领域:
材料科学
·
纳米技术
·
催化
·
光伏
·
电能转换与存储
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 9
·1235
·
IF 3.236
Qi Hu,Jiantao Niu,Ke-Qin Zhang,Mu Yao
The photocatalytic hydrogen production efficiency of a single SrTiO3photocatalytic catalyst is often low, which is mainly due to the serious combination of electrons and holes produced by photocatalysis as well as the mismatch of the redox capacity and light absorption range. Construction of semiconductor heterojunctions can solve these problems. CdS has a narrow band gap, which can effectively utilize visible light, and it has a band structure matched with that of SrTiO3. Therefore, CdS is considered as an ideal candidate for constructing heterojunctions with SrTiO3. In this paper, bamboo pulp fibers were used as the substrate, and SrTiO3was coated on the substrate through the solvothermal process. CF/SrTiO3rich in oxygen vacancies was formed by high temperature carbonization, and heterojunctions were formed by loading CdS on the surface of the CF/SrTiO3composite material through the hydrothermal method, thus obtaining one-dimensional CF/SrTiO3/CdS core–shell photocatalysts. The structure and photocatalytic hydrogen production performance of the CF/SrTiO3/CdS core–shell photocatalysts were mainly studied. The photocatalytic hydrogen production experiment showed that the hydrogen production rate of the CF/SrTiO3/CdS-2 sample under the optimized process was as high as 577.39 μmol/g·h, which was about 11 times that of the CF/SrTiO3sample. In this composite photocatalytic material system, the loading of the CdS nanospheres could enhance the visible light absorption capacity of the composite catalyst, promote the rapid separation and high-speed migration of photocarriers, and significantly improve the photocatalytic activity.Keywords:SrTiO3;photocatalytic;hydrogen production;carbon fiber;oxygen vacancy;CdS
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 1
·205-213
·
IF 3.9
Shenghao Wang,Hongbo Liu,Yuanyuan Wang,Hailan Qin,Jianwei Zhao,Zhilun Lu,Zhu Mao,Dawei Wang
BiFeO 3 –SrTiO 3 (BF–ST) ceramics have been considered a novel class of lead-free dielectric materials exhibiting notable dielectric constants and remarkable thermal stability. In this work, we fabricated a series of (1 − x )BF– x ST (0.32 ≤ x ≤ 0.44) ceramics near the morphotropic phase boundary and comprehensively investigated their microstructure and electrical properties, which seeks to optimize the piezoelectric performance. As the ST content increases, a gradual reduction in the rhombohedral phase fraction is observed alongside a corresponding increase in the cubic phase fraction. Although x = 0.38, the maximum grain size of 5.66 μm is obtained, accompanied by a distinctive heterogeneous core–shell microstructure, which demonstrates a high remanent polarization of 51.2 μC/cm 2 and a maximum d 33 value of 72 pC/N. Furthermore, impedance spectroscopy analysis reveals the formation of a conductive core and a nonconductive shell within the sample. These findings highlight the potential of optimized BF–ST ceramics as promising alternatives to lead-based piezoelectric materials, offering exceptional ferroelectric and piezoelectric properties.
研究领域:
材料科学
·
物理学
✓ 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）