JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·Vol. 45
·期 5
·117112
·
IF 5.8
Yaqian Du,Jianbo Li,Jun Wang
Compared with perovskite SrTiO 3 , SrO(SrTiO 3 ) 2 exhibits lower thermal conductivity , while maintaining a high Seebeck coefficient , making it a promising material for photothermoelectric conversion. However, the relationship between its infrared and thermoelectric properties remains unexplored. This study examines the effect of Gd doping on these properties of SrO(SrTiO 3 ) 2 . Increased Gd doping induces a gradual transformation of SrO(SrTiO 3 ) 2 -based into a SrTiO 3 -based material, resulting in a composite comprising three phases and a notable reduction in thermal conductivity . At 973 K, the thermal conductivity decreases to a minimum of 1.4 W m −1 K −1 , which is 23 % lower than undoped SrO(SrTiO 3 ) 2 and 51 % lower than SrTiO 3 . Like SrTiO 3 , SrO(SrTiO 3 ) 2 absorbs infrared radiation in the 8–14 μm range. Although the highest ZT value reaches only 0.06 at 973 K, it shows a positive correlation with infrared emissivity. These findings are valuable for advancing the application of thermoelectric effects and the development of high-performance infrared materials.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
能源材料
·
红外光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 16
·21188-21196
·
IF 2.478
Sun Ying,Liu Hongbo,Liu Fangchao,Liu Gang
Recently, it is shown that the thin films of BiFeO 3 –BaTiO 3 –SrTiO 3 have ultrahigh-energy storage density. However, the energy storage properties of BiFeO 3 –BaTiO 3 –SrTiO 3 ternary bulk ceramics have not been studied. In this work, the BiFeO 3 –BaTiO 3 –SrTiO 3 ceramics have been prepared by a conventional solid-state reaction method and the dielectric and electrical energy storage properties have been studied in detail. The ceramic with the composition of 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 is experimental evidenced to be the best with the highest dielectric permittivity in the ternary system. To suppress the dielectric loss and leakage current, 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 has been doped with Mn. Mn-doped ceramics have the same perovskite structure but the fine grains are formed and the number of pores decreases. Mn-doping reduces dielectric loss, enlarges the thermally stable zone of the dielectric, and improves the electrical energy storage density simultaneously. 2 mol% Mn-doped 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 has the most optimized electrical energy storage properties. The energy storage density is 1.33 J/cm 3 and the efficiency is 88.5% at 185 kV/cm. The discharge energy density is 2.7 times that of undoped 0.25BiFeO 3 –0.30BaTiO 3 –0.45SrTiO 3 and 90% stored energy can release in 120 ns.
研究领域:
材料科学
·
电介质物理学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Deng Rongyu,He Zhenjiang,Chu Fulu,Lei Jie,Cheng Yi,Zhou You,Wu Feixiang
The conventional weak acidic electrolyte for aqueous zinc-ion batteries breeds many challenges, such as undesirable side reactions, and inhomogeneous zinc dendrite growth, leading to low Coulombic efficiency, low specific capacity, and poor cycle stability. Here, an aqueous densified electrolyte, namely, a conventional aqueous electrolyte with addition of perovskite SrTiO 3 powder, is developed to achieve high-performance aqueous zinc-ion batteries. The densified electrolyte demonstrates unique properties of reducing water molecule activity, improving Zn 2+ transference number, and inducing homogeneous and preferential deposition of Zn (002). As a result, the densified electrolyte exhibits an ultra-long cycle stability over 1000 cycles in Zn/Ti half cells. In addition, the densified electrolyte enables Zn/MnO 2 cells with a high specific capacity of 328.2 mAh g −1 at 1 A g −1 after 500 cycles under an extended voltage range. This work provides a simple strategy to induce dendrite-free deposition characteristics and high performance in high-voltage aqueous zinc-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jishu Han,Fangxu Dai,Ying Liu,Ruiyang Zhao,Lei Wang,Shouhua Feng
The photocatalytic hydrogen production has become one of the most promising strategies to solve the energy crisis and environmental pollution. Novel CdSe/SrTiO 3 nanocomposites (average diameter ≈ 114.6 nm) with high photocatalytic activity are synthesized and used for visible light photocatalytic water splitting for hydrogen production . Through optimizing the concentration of CdSe QDs, CdSe/SrTiO 3 nanocomposites exhibit increased visible light absorption and enhanced photocatalytic hydrogen evolution efficiency compared to SrTiO 3 nanoparticles. The maximum H 2 evolution amount reaches to 3350.53 μmol in 8 h by using CdSe/SrTiO 3 -3 as catalyst. Owing to the formation of heterojunction at the interface between CdSe and SrTiO 3 , the electrochemical impedance spectrum of CdSe/SrTiO 3 -3 exhibits the smallest arc radius and the photocurrent density of CdSe/SrTiO 3 -3 reaches to 0.26 μA cm −2 . The photogenerated electrons are effectively separated and transferred and the recombination of electron-hole pairs is avoided, thus significantly improving the photocatalytic hydrogen production performance of CdSe/SrTiO 3 nanocomposites.
研究领域:
材料科学
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物理化学
·
纳米催化
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能源材料
·
光催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Zhenlong Zhang,Guangsheng Liu,Yanli Mao
To investigate the mechanisms of the improvement on separation efficiency of photogenerated carriers , a Fe 2 O 3 /SrTiO 3 heterojunction semiconductor with an improved separation efficiency was successfully prepared. The heterojunction semiconductor was characterized with X-ray diffraction (XRD), UV–vis absorption spectrum , scanning electron microscope (SEM) and surface photovoltage (SPV) spectroscopy. The energy band diagrams of Fe 2 O 3 and SrTiO 3 were determined with X-ray photoelectron spectroscopy (XPS), based on which the conduction band offset (CBO) between Fe 2 O 3 and SrTiO 3 was quantified to be 1.26 ± 0.03 eV. The recombination of photogenerated carriers was investigated with photoluminescence (PL) spectrum, which indicates that the formation of Fe 2 O 3 /SrTiO 3 decreases the recombination. Thus the improved separation efficiency is mainly due to the energy difference between the conduction band edges of Fe 2 O 3 and SrTiO 3 , and the decreased electron-hole recombination for Fe 2 O 3 /SrTiO 3 .
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Yi Zhu,Xu Xiang,Gengguang Luo,Tao Zhang,Ying Li,Ju Gao,Wenlin Wang,Tianyin Huang,Hongfang Zhang
Water contamination by organic pollutants, such as dyes, poses significant environmental and health risks, necessitating the development of efficient and sustainable degradation methods. Tribocatalysis, utilizing mechanical energy to generate reactive triboelectrons, presents an effective approach under ambient conditions with or without external illumination. In this work, SrCO₃–SrTiO₃ (SCO@STO) composite catalysts were synthesized via conventional ceramic processing, with sintering temperatures adjusted (1000 °C and 1150 °C) to control lattice strain and oxygen vacancy concentrations. Experimental results showed that these sintering conditions significantly influenced the catalytic performance. Specifically, STO(A)‒1000 exhibited superior degradation efficiency under illumination due to abundant oxygen vacancies extending photogenerated carrier lifetimes and synergistically enhancing photocatalysis combined with triboelectrons from mechanical stirring, achieving nearly complete degradation of methylene blue (MB, 97 %) within 1 hour. Conversely, STO(A)‒1150 demonstrated higher catalytic performance in dark conditions, attaining 100 % degradation of Rhodamine B (RhB) within 48 h, primarily due to enhanced strain-induced triboelectric charge generation. The interplay among band alignment, oxygen vacancies, and lattice strain in SCO@STO composites highlights a versatile strategy for optimizing organic pollutant degradation under diverse environmental conditions, advancing effective environmental remediation.
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
CATALYSIS LETTERS
·
2024
·
IF 2.3
Sun Xiaoqin,Zhang Zehua,Yun Sining
Plasmonic-driven photocatalyst have outstanding solar driven surface plasmon resonance (SPR) characteristics, and it is a prospective approach to improve photocatalytic performance. Herein, plasmonic Co metal decorated SrTiO 3 : La/Cr hollow cubes was developed and constructed by template-free hydrothermal method. The photocatalyst possesses the merits of the hollow structure with large specific surface area and strong light absorption. The intimate contact between Co and SrTiO 3 : La/Cr promotes the interfacial charge transfer. Co-SrTiO 3 : La/Cr manifests the superior photocatalytic performance toward water splitting for hydrogen evolution compared with that of other cocatalyst. And the H 2 evolution exceeds 210 μmol·g −1 ·h −1 under the optimum of the amount of 1.25wt% Co NPs. The mechanism of the enhanced performance comes from the improvement of light absorption in the visible-light region induced by SPR, as well as the efficient interfacial separation and transport of charge carriers on the photocatalyst facilitated by the local electromagnetic fields of plasmonic Co metal. Graphical Abstract
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Chenxi Huang,Jun Fu,Miaomiao Xiang,Jiefu Zhang,Hualing Zeng,Xiang Shao
The elaborate interface interactions can be critical in determining the achievable functionality of a semiconductor heterojunction (SH), particularly when two-dimensional material is enclosed in the system and its thickness is at an atomic extreme. In this work, we have successfully constructed a SH model system composed of typical transition-metal chalcogenide (TMDs) and transition metal oxides (TMO) by directly growing molybdenum sulfide (MoS2) nanosheets on atomically flat strontium titanate (SrTiO3) single crystal substrates through a conventional chemical vapor deposition (CVD) synthetic method. Multiple measurements have demonstrated the uniform monolayer thickness and single crystallinity of the MoS2 nanosheets as well as the atomic flatness of the heterojunction surface, both characterizing an extremely high quality of the interface. Clear evidence have been obtained for the electron transfer from the MoS2 adlayer to the SrTiO3 substrate which varies against the interface conditions. More importantly, the photoluminescence of MoS2 is significantly tailored, which is correlated with both the cleanness of the interface and the crystal orientation of the SrTiO3 substrate. These results not only shed fresh lights on the structure–property relationship of the TMDs/TMO heterostructures but also manifest the importance of the ideal interface structure for a hybridized system.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 8
·2267-2277
·
IF 7.683
Qian Zhou,Qingyun Shi,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Coupling the piezoelectric effect of piezoelectric semiconductors with the photocatalytic technique is considered as a promising strategy for suppressing the recombination of photogenerated charge carriers. A new piezo-photocatalyst, a Rh-doped SrTiO3 inverse opal, was prepared by a hard-template method. Doping of photoactive Rh3+ played a significant role in improving the visible-light response ability and piezo-/photocatalytic activity of SrTiO3. In addition, the introduction of 3D ordered inverse opal structure was favourable for light harvesting. Co-excited by solar energy (visible light) and mechanical energy (ultrasonic vibration), the Rh-doped SrTiO3 inverse opal showed a significantly enhanced degradation rate of bisphenol A, which was 8.9 times higher than that of SrTiO3 nanoparticles under visible light only. The boosted piezo-photocatalytic efficiency was ascribed to the efficient separation of photogenerated electron–hole pairs under the acceleration of the built-in piezoelectric field in the Rh-SrTiO3 inverse opal, as confirmed by piezoelectric force microscopy (PFM). Therefore, this work provided a new insight into SrTiO3-based piezo-photocatalytic materials for efficient environmental remediation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yuanyuan Wang,Shenghao Wang,Xueqing Yu,Lei Cao,Minmin Mao,Hadi Barzegar Bafrooei,Zhilun Lu,Kaixin Song,Dawei Wang
The dielectric loss (tan δ) value of stoichiometric SrTiO 3 (ST), prepared using the solid-state reaction method, exhibits a random variation between 0.0006 and 0.01968 at room temperature and a frequency of 1 kHz in the literature. This variability makes it challenging to obtain reliable and reproducible performance for ST-based devices, especially when the underlying reasons are not yet completely understood. This work reports the significant effects of different raw materials, with various forms of TiO 2 , on the dielectric and electrical properties of ST ceramics. The results show that the purity of SrCO 3 and TiO 2 ultimately leads to distinct differences in dielectric properties, impedance properties, activation energy across the ST ceramics. Crystal comparison demonstrates that anatase TiO 2 is more suitable for dielectric applications. These results provide a reasonable explanation for the large variations in reported ST properties in the literature, which emphasizes the critical importance of selecting suitable reagents in ST-based ceramics. This insight opens up a new avenue for design optimization and highlights the promising potential of ST-based ceramics.
研究领域:
材料科学
·
陶瓷
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Ying Li,Shengli Niu,Yanan Hao,Wenbo Zhou,Jun Wang,Jiangwei Liu
In this work, the catalytic performance of the mesoporous SrTi 1- x Fe x O 3 ( x = 0.05, 0.10, 0.15 or 0.20) for biodiesel production from palm oil with a high acid value is investigated. The physicochemical properties of the catalysts are revealed by various characterization methods, including XRD , N 2 adsorption-desorption, XPS , Raman, EPR, SEM-EDS, and CO 2 /NH 3 -TPD. Fe doping results in many oxygen vacancies in the perovskite structure , which increases the electron density of the active sites on the surface and promotes the polarization of the perovskite structure, thus improving the catalytic activity of the catalyst. The most oxygen vacancies and the best catalytic performance are observed in the SrTi 0.85 Fe 0.15 O 3 catalyst, where the FAME yield of 97.52% is achieved with the catalyst concentration of 5 wt % and methanol to oil molar ratio of 18:1 at 150 °C for 3 h. Meanwhile, the catalyst maintains a FAME yield of 83.59% for the fourth reused cycle. Also, the catalyst exhibits strong resistance to FFAs, where the FAME yield is still 93.58% even with oleic acid addition of 12 wt % to show the capability in catalyzing the simultaneous esterification and transesterification .
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiajun Ruan,Tao Zhong,Yuxi Guo
The key elements that influence the properties and capabilities of particulate photocatalysts are their crystallinity , size, and surface active sites. However, simultaneously controlling these three variables remains a challenge. In this study, we present the first exploration into the use of a simple ethylenediaminetetraacetate (EDTA) etching technique to decrease the particle size and increase the surface active sites of photocatalysts while preserving their high crystallinity. By employing SrTiO 3 as a model photocatalyst, we were able to create an ordered step nanostructure on the surface of sintered SrTiO 3 . As a result of the EDTA treatment, the particle size was reduced while the crystallinity was maintained. The separation of photogenerated electrons and holes is enhanced by the combination of reduced particle size and high crystallinity. To enhance chemical reaction activities, the organized surface nano-step structures serve as high-activity sites. As a result, when subjected to simulated light irradiation , the EDTA-treated SrTiO 3 samples demonstrate improved photocatalytic performance for water splitting into H 2 and O 2 in a stoichiometric amount that is 3.8 times greater than that of untreated SrTiO 3 . Since EDTA interacts with most metals, this simple EDTA etching technique has the potential to be further developed to modify additional photocatalysts with exceptional performance for a variety of applications.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）