JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Lei Zhang,Zheng Cao,Qing-Qiao Fu,Chun-Yu Li,Ya-Qian Du,Yan-Nan Li,Ta La,Dai-Bing Zhang,Jun Wang
Yb 2 Ti 2 O 7 exhibits ferromagnetic and magnetic properties , which are expected to exert a discernible influence on the thermoelectric properties of SrTiO 3 composite. The La-Yb-Nb-doped SrTiO 3 powders, synthesized via the hydrothermal method , were prepressed and then buried in carbon powder before being sintered in a muffle furnace at 1573 K for 5 h. The Yb dopant precipitated during the sintering process, leading to the in-situ formation of Yb 2 Ti 2 O 7 . The content of Yb 2 Ti 2 O 7 increased with an increasing Yb concentration, resulting in a reduction in thermal conductivity and grain boundary potentials, and an increase in the peak electrical conductivity . The La and Nb dopants affect the electrical conductivity and the Seebeck coefficient. Therefore, by controlling the La, Nb, and Yb ratios, the La8Yb2Nb15 sample achieved the largest power factor ( PF ) value of 0.9 mWm −1 K −2 and a low thermal conductivity of 2.9 W m −1 K −1 , resulting in a high ZT value of 0.32 at 1000 K.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Jiajing Zhu,Hui Wang,Liangjun Huang,Liuzhang Ouyang,Lan Zhang,Min Zhu
Nanosized SrTiO3, a common photocatalyst that enhances water splitting for hydrogen production, has been synthesized to catalyze the reversible hydrogen gas–solid reaction of MgH2. Compared to the pure MgH2, the milled MgH2-SrTiO3 composite shows significantly enhanced hydrogen storage properties, absorbing 3.5 wt % H2 within 1 min at room temperature and releasing 6.1 wt % H2 within 9 min at 250 °C. The activation energy for dehydrogenation is 82.91 kJ/mol, which is 52.09 kJ/mol lower than that of as-milled MgH2. The composite retains a capacity of 5.47 wt % after 40 cycles of dehydrogenation at 250 °C. The catalytic mechanism of nanosized SrTiO3 was discussed. Therefore, like anatase TiO2 photocatalysts, SrTiO3 shows an excellent catalytic effect to enhance the hydrogen sorption of MgH2 at significantly lower temperatures. A significant number of photocatalytsts have great potential to enhance the hydrogen sorption of Mg, making them promising candidates for solid-state hydrogen storage materials.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
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IF 3.9
Chen Huyue,Li Yitao,Wang Jingrong,Lu Tengfei,Xu Haiping,Yang Dandan,Chen Lifei
As the demand for lightweight and compact integrated devices accelerates, dielectric materials are pivotal in enabling efficient energy storage. Composite materials, particularly those combining a polymer matrix with two-dimensional (2D) conductive MXene fillers, have emerged as promising candidates for improving dielectric performance. However, their high dielectric constant is often accompanied by significant dielectric loss, limiting their application in high-frequency circuits and electronic devices. This study investigates a ternary composite system consisting of polyvinylidene fluoride (PVDF) as the matrix, Ti 3 C 2 T x MXene as a conductive filler, and strontium titanate (SrTiO 3 ) as a ceramic filler to enhance dielectric properties. The ternary composites were prepared through a combination of physical mixing followed by a hot-pressing process. The results demonstrate that the MXene/SrTiO 3 /PVDF composites achieve a notable reduction in dielectric loss while retaining a high dielectric constant. At 12 wt% MXene, the composite achieves a dielectric constant of 117.8 at 10 3 Hz, 14.7 times higher than pure PVDF, with dielectric loss reduced by 71.4% compared to MXene/PVDF composites. Furthermore, the incorporation of SrTiO 3 markedly enhances the thermal stability, elevating the thermal decomposition temperature of the composite to 437.88 °C, up from 357.9 °C for pure PVDF. This research presents a promising strategy for developing capacitors with superior dielectric properties and enhanced thermal stability, suitable for high-temperature applications.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 13
·3038-3044
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IF 0.791
Xiao Xinglan,Zhao Yingna,Liu Tao,Zhang Jianchao,Wang Jiansheng
Abstract Flower-like SrTiO 3 was prepared by hydrothermal method and BiVO 4 was prepared by sol–gel method, and then the two materials were fully mixed under the condition of calcination at 500°C for 2 h. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–Vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS). The results showed that the BiVO 4 nanoparticles were embedded on the flower-like SrTiO 3 , and the heterojunction between BiVO 4 and SrTiO 3 was formed which effectively improved the migration efficiency of photogenerated carriers. The UV–Vis test results indicated that the corresponding range of STO–10 wt % BVO composite photocatalyst changes from 380 to 490 nm, and the photocatalytic efficiency reached 72% by degrading tetracycline hydrochloride (TC) under simulated sunlight. Mechanism analysis shows that the type I heterojunction is successfully built between SrTiO 3 and BiVO 4 , which promotes the migration and separation of photogenerated carriers and reduces the recombination rate of photogenerated electrons and holes.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Hui Zhang,Liping Hao,Jiyang Xie,Jianyun Cao,Wanbiao Hu
Thermoelectric materials based on SrTiO 3 are low in cost and environmentally friendly, but their performance must be further improved for practical application. In this study, we show that isovalent substitution of the B-site Ti 4+ in a La doped SrTiO 3 (LSTO) matrix is both effective in reducing thermal conductivity and improving power factor ( PF ). In brief, Zr 4+ substituted LSTO (La 0.08 Sr 0.9 Ti 1- x Zr x O 3 ; x = 0, 0.02, 0.04, and 0.06; labeled as LSTO-Zr 0.02 , LSTO-Zr 0.04 and LSTO-Zr 0.06 , respectively) are prepared by solid-state-reaction and densified in a reducing environment. The optimized LSTO-Zr 0.02 shows a 30 % increase in PF and 12 % reduction in thermal conductivity compared with that of LSTO. Particularly, the LSTO-Zr 0.06 sample with highest substitution level has the largest reduction in thermal conductivity compared to the LSTO matrix (30 %, from 8.2 to 5.6 W m −1 K −1 at 300 K). The reduction in thermal conductivity is because the Zr 4+ substitution introduces chemical impurities and lattice defects, benefiting the scattering of phonon thermal carriers. The improvement in PF after Zr substitution is attributed to the enhanced Seebeck coefficient because of the slightly reduced carrier concentration. In contrast to the B-site Ti 4+ cations, which are partially reduced to Ti 3+ under the reducing environment and contribute to electron carriers, the Zr 4+ are not reduced, resulting in lower electron carrier concentrations after Zr 4+ substitution. This isovalent substitution strategy provides a potential route for the development of high-performance thermoelectric materials based on SrTiO 3 .
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 38
·16963-16968
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IF 7.76
Guoqiang Zhang,Wenshuai Jiang,Shixin Hua,Haifeng Zhao,Ligong Zhang,Zaicheng Sun
Defects (Ti3+ or oxygen vacancies) have been demonstrated to promote the charge separation process in TiO2 based photocatalysts. Particularly, the bulk defects within a certain concentration can give a great enhancement for both light absorption and charge separation efficiency. In this report, we explored a one-step molten salts route to synthesize SrTiO3 nanocubes with bulk defects (Ti3+ doped) by using SrCO3 as a Sr source, and TiO2 and Ti powder as Ti sources. The amount of defects can be tuned by changing the molar ratio of Ti/TiO2. The corresponding bandgap of SrTiO3 can be changed from 3.29 to 2.73 eV with the increase of defects. X-ray diffraction and electron microscopy disclose that SrTiO3 is highly crystalline and has a cubic morphology. X-ray photoelectron spectroscopy and electron paramagnetic resonance indicate that the as-prepared SrTiO3 is close to the Ti3+ doped SrTiO3. Surface photovoltage spectroscopy (SPS) and field-induced SPS confirm that Ti3+ doping in the SrTiO3 turns it from an n-type semiconductor to p-type. The SrTiO3 with an optimal amount of defects exhibits highly enhanced photocatalytic performance. An excess amount of defects results in a weak SPS response and photocatalytic performance.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Hongmin Dai,Xuan He,Xing Du,Weixin Li,Daheng Wang,Hui Chen,Wei Fang,Lei Zhao
Applying piezoelectric effect on modulating charge transport behavior was considered as one efficient strategy to make feasible charge separation in photocatalysts towards boosting hydrogen evolution performance. Here, with employing corona-poling treatment, SrTiO 3 is converted to be a piezoelectric component in the constructed type II NH 2 -MIL-125(Ti)/SrTiO 3 heterojunction . Since the piezoelectric field could tilt the band bending to a degree to be convenient for the charge transfer from SrTiO 3 to NH 2 -MIL-125(Ti), it is also favorable to offer additional active sites on SrTiO 3 to form dual reduction sites for the following piezo-photocatalytic reaction. Both the ameliorated surficial polarization and charge transfer trajectory in NH 2 -MIL-125(Ti)/SrTiO 3 type II heterojunction are devoted to the boosted hydrogen production rate for NH 2 -MIL-125(Ti)/SrTiO 3 -0.1 (NM/STO-0.1), that is up to 1562.3 μmol h −1 g −1 , 1.79 times higher than that of unpolarized NM/STO-0.1 (871.6 μmol h −1 g −1 ) and 2.35 times higher than that of NH 2 -MIL-125(Ti) (663.8 μmol h −1 g −1 ), respectively. This research reported initially the assistant of SrTiO 3 with piezoelectric feature for enhanced performance photocatalytic hydrogen evolution, which could be one prominent strategy to achieve the reasonable design of efficient photocatalytic system.
研究领域:
材料科学
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纳米技术
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催化
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能源材料
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2012
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IF 2.289
Y.T. Zheng,Z.L. Zhang,Y.L. Mao
A composite of SrTiO 3 /TiO 2 was successfully prepared using TiO 2 (Degussa P25) and SrTiO 3 powders as starting materials. The composite was characterized by X-ray diffraction (XRD), UV–vis absorption spectrum, scanning electron microscope (SEM), and surface photovoltage spectroscopy (SPS). The SrTiO 3 /TiO 2 composite presents an enhanced photovoltaic response compared with pure TiO 2 and SrTiO 3 . The enhancement was explained by investigating the energy levels of TiO 2 and SrTiO 3 , and the photoluminescence (PL) spectra of TiO 2 , SrTiO 3 and SrTiO 3 /TiO 2 . The analysis of energy levels shows that those of TiO 2 and SrTiO 3 are matching, which improves the separation efficiency of photogenerated carriers. The PL spectra indicate that the formation of SrTiO 3 /TiO 2 composite decreases the recombination rate of photogenerated carriers. Thus the photovoltaic response enhancement is mainly resulting from the improved separation efficiency and decreased recombination rate of photogenerated carriers for SrTiO 3 /TiO 2 composite.
研究领域:
材料科学
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光电化学
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DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 46
·465404
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IF 3.5
Penghui Bai,Kai Lei,Juan Xie,Hu Wang,Xiaolan Kang,Xia Wang
This paper investigates the impact of Pd/Ni modification on the photocatalytic hydrogen production performance of SrTiO3 (STO). STO catalysts were synthesized using a hydrothermal method, and Pd/Ni modification was applied on the surface of STO through chemical deposition. Experimental results demonstrate that the hydrogen evolution rate of Pd/Ni-modified STO (Pd/Ni-STO) reaches 2232.14 μmol g−1 h−1. X-ray absorption fine structure spectroscopy analysis reveals substitutional doping of Ni with Ti and coordination of Pd with surface O. X-ray photoelectron spectroscopy analysis indicates the introduction of oxygen vacancies due to Pd/Ni doping. Density functional theory calculations suggest that Ni doping activates neighboring Ti atoms, leading to the formation of bimetallic catalytic sites composed of oxygen vacancies and Ti atoms, greatly enhancing the photocatalytic hydrogen evolution performance. This study not only provides an effective catalyst for photocatalytic applications but also offers insights into the underlying mechanism, which may stimulate the development of metal-doped catalytic materials and have implications for a range of other applications.
研究领域:
材料科学
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能源科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Zhendong Liu,Zhen Ma
TiO 2 has been regarded as an efficient benchmark photocatalyst that can work under ultraviolet light. However, further modification of TiO 2 for achieving even higher photocatalytic activities is necessary for practical applications and for enriching the family of TiO 2 -based photocatalysts. Herein, a novel Ag-SrTiO 3 /TiO 2 photocatalyst was prepared by hydrothermally treating TiO 2 nanosheets in an aqueous Sr(OH) 2 solution (to form SrTiO 3 nanocubes supported on TiO 2 nanosheets) followed by depositing Ag nanoparticles via photoreduction in the presence of an aqueous AgNO 3 solution. In this case, Ag nanoparticles were found to be deposited on both SrTiO 3 and TiO 2 surfaces. The resulting Ag-SrTiO 3 /TiO 2 was found to be more active than reference catalysts such as TiO 2 , SrTiO 3 /TiO 2 , Ag/TiO 2 , and Ag/SrTiO 3 in photocatalytic degradation of rhodamine B (RhB) and ciprofloxacin hydrochloride (CIP) under simulated sun light. Relevant catalysts were characterized systematically, and possible reasons for the enhanced activity of Ag-SrTiO 3 /TiO 2 was explained.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Xiaoting Liu,Xiaofang Shen,Baisheng Sa,Yinggan Zhang,Xin Li,Hao Xue
The piezoelectric effect can effectively modulate the energy band structure of the optoelectronic semiconductor and the transport behavior of carriers. Here, we propose a BaTiO 3 /SrTiO 3 nanocomposite , and effectively enhance its photocatalytic performance through piezoelectric effect. The heterostructured BaTiO 3 /SrTiO 3 nanofibers were prepared by electrospinning, and they were polarized by a high-voltage electric field. Under the co-excitation of ultrasonic and UV irradiation, the BaTiO 3 /SrTiO 3 nanofibers presented excellent degradation ability of pollutants in water. The BaTiO 3 /SrTiO 3 nanofibers can degrade Rhodamine B (RhB) dye by ~97.4% within 30 min under the combined action of ultrasonic and ultraviolet irradiation, which was 2.2 times that of pure SrTiO 3 nanofibers. The piezoelectric effect provides a built-in polarization field to improve the separation efficiency of photo-generated carriers. Moreover, DFT calculation results showed that piezoelectric potential can reduce the band gap width of the SrTiO 3 . This article provides a promising strategy for improving photocatalytic performance of nanocomposites through the use of mechanical energy.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Juan Liu,Yu Sun,Lilin Xiang,TuLai Sun,Zilong Yu,Bing Cui,Chuangui Jin
In the present study, SrTiO 3 was selected to enhance the multiferroic characteristics of Bi 0.88 Sm 0.12 FeO 3 (BSF) ceramics. With increasing SrTiO 3 content, the principal phase of BSF ceramic transitions from rhombohedral R3c to Pna2 1 . Through DSC and dielectric analysis, it was observed that both the Curie temperature and Néel temperature decreased proportionally with the augmentation of SrTiO 3 content. When x = .1, the optimal ferroelectric performance is achieved, and the highest remanent polarization value is 55.47 µC/cm 2 , significantly surpassing that of BSF ceramics. Moreover, the PFM test results showed that as the substitution content increased, the domains in the BSF ceramic gradually transformed from normal ferroelectric domains to polar nanomicro-domains. Magnetic and magnetoelectric results show that when x = .1, the best magnetic properties are obtained, M r = 59.7 emu/mol. The magnetoelectric coefficient α ME initially increased and then decreased with the increasing SrTiO 3 content, reaching its optimum magnetoelectric properties at x = .1, where α ME = .47 mV cm –1 Oe –1 . In summary, when the substitution amount of SrTiO 3 reaches 10%, the ferroelectric, magnetic, and magnetoelectric properties of BSF ceramics are significantly improved.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
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