Nano Energy
·
2018
·
IF 13.12
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
In artificial photocatalysis for hydrogen (H 2 ) generation from water reduction, low apparent quantum efficiency (AQE) always confines the photocatalytic conversion efficiency. Here, we demonstrate a new strategy for the design and synthesis of one-dimensional (1D) SrTiO 3 @Mo 2 C core-shell nanostructure for highly enhanced photocatalytic H 2 generation activity. The thin nanolayer of Mo 2 C improves the interfacial conductivity, facilitates transport of photo-generated charge carriers as well as prolongs charge carriers’ lifetime, that minimizing the recombination of photo-generated electrons and holes. Thus SrTiO 3 @Mo 2 C hybrid achieves drastically enhanced photocatalytic H 2 generation rate up to 7.93 mmol h −1 g −1 with respect to the pristine SrTiO 3 (0.53 mmol h −1 g −1 ) in a solar-driven reaction system, with an AQE of 29.3% at 313 nm. The charge carrier dynamics based mechanism was further confirmed by analysis of time-resolved photoluminescence (TRPL), surface photovoltage (SPV), transient photovoltage (TPV), open circuit potential (OCP) decay curves as well as the electrochemical impedance spectroscopy (EIS) measurements. It is unambiguously to demonstrate that Mo 2 C is a highly active cocatalyst to dramatically boost the charge separation for photocatalytic water reduction.
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 25
·13390-13401
·
IF 7.443
Enyan Guo,Longwei Yin
We present a novel type of SrTiO3/TiO2 nanosheet heterostructure via a facile hydrothermal process, with a tunable microstructure, phase component and surface area by adjusting the molar ratio of Sr and Ti precursors. The synthesized SrTiO3/TiO2 heterostructure nanostructures can provide a high surface area and porous structure for improving the dye loading capacity and hence the amount of photogenerated charges contributing to the photocurrent. The formation of heterostructures between SrTiO3 and TiO2 with a uniquely matched band gap energy structure can efficiently separate photogenerated charge carriers. Photoluminescence emission and electrochemical impedance spectroscopy (EIS) and incident photon-to-electron conversion efficiency (IPCE) measurements reveal a lower recombination rate of photogenerated electrons and holes, and a longer electron lifetime for DSSCs based on the SrTiO3/TiO2 heterostructures. The photoelectric conversion efficiency and short-circuit current density of DSSCs based on SrTiO3/TiO2 heterostructures are greatly enhanced over those of pure TiO2 nanosheets. DSSCs based on the SrTiO3/TiO2 heterostructures show a highest short-circuit current density of 12.55 mA cm−2 and a maximal photoelectric conversion efficiency of 7.42% under one sun illumination.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
CARBON
·
2021
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IF 9.594
Yuxiang Liu,Xuejun Xu,Sufan Zheng,Shangchun Lv,Hewen Li,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng,Feiyu Kang
Aluminum-doped strontium titanate SrTiO 3 (Al), has been demonstrated as the suitable photocatalyst for overall water splitting. Noble metals, such as RhCrO x , are widely applied to accelerate the photocatalytic hydrogen evolution . Herein, Ni single atoms anchored on nitrogen-doped graphene (Ni SA-NG) are adopted to replace noble metal as hydrogen (H 2 ) evolution cocatalysts for SrTiO 3 (Al)/CoO x photocatalyst. The prepared Ni SA-NG/SrTiO 3 (Al)/CoO x photocatalyst exhibits remarkable activity for photocatalytic overall water splitting with the H 2 evolution rate of 498 μmol g −1 h −1 and oxygen (O 2 ) evolution rate of 230 μmol g −1 h −1 , respectively. Ni SA-NG not only improves the efficiency of photogenerated charge transfer and separation through the Ti–O–C bonds acting as the electron transfer freeway, but also provides highly active sites to accelerate the surface H 2 evolution rate. This research provides a valuable method to construct SrTiO 3 -based photocatalyst without noble metal cocatalysts.
研究领域:
材料科学
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催化化学
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能源科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 34
·2301815
·
IF 19
Yunpeng Zheng,Hetian Chen,Zhifang Zhou,Yueyang Yang,Mingchu Zou,Wenyu Zhang,Bin Wei,Jinghan Cai,Jin-Le Lan,Di Yi,Ce-Wen Nan,Yuan-Hua Lin
Thermoelectric oxide thin films are promising in chip cooling. The issues on the orientation of thin films are essential as they are related to the structures, morphologies, and thermoelectric properties. In this regard, the orientation modulation is conducted on La-doped SrTiO 3 thin films on (LaAlO 3 ) 0.3 (Sr 2 TaAlO 6 ) 0.7 (LSAT) single crystal substrates. Layer-by-layer growth mode is found in (001)- and (110)- oriented thin films, resulting in few grain boundaries (GBs). In (111)-oriented films, island growth mode leads to columnar grain boundaries that build up potential barriers for electrons to be strongly scattered and filtered, suppressing electron mobility and increasing effective mass. In addition, the GBs serve as oxygen vacancy diffusion paths when annealing, causing increased carrier concentration and lattice contraction. The weighted mobility of 71.9 cm 2 V −1 s −1 and electrical conductivity of ≈600 S cm −1 are realized in the (001)-oriented film at room temperature. Ultimately, outstanding power factor values of ≈569 µW m −1 K −2 (room temperature) and ≈791 µW m −1 K −2 (573 K) are successfully achieved, outperforming those in polycrystalline ceramics and (111)-oriented films. This study systematically investigates the influence of grain boundaries and orientations on SrTiO 3 -based thermoelectric films, which lays a solid foundation for improving thermoelectric performance in other oxide thin films.
研究领域:
材料科学
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热电学
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薄膜
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固体物理学
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产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Yue Chang,Ying Xuan,Chenxi Zhang,He Hao,Kai Yu,Shuangxi Liu
The core-shell shaped Pt@CdS nanoparticles were successful anchored onto the surface of three-dimensionally ordered macroporous (3DOM) SrTiO 3 with different pore sizes through a two-step photo-deposition method, to form a series of promising Z-scheme Pt@CdS/3DOM-SrTiO 3 composites for photocatalytic hydrogen evolution from water splitting. The well-ordered inverse opal and ternary heterojunction structure of Pt@CdS/3DOM-SrTiO 3 composites were well illustrated through SEM and HRTEM characterizations. The Pt@CdS/3DOM-SrTiO 3 composites exhibited excellent efficiency for hydrogen evolution (57.9 mmol/g h) under UV–vis light irradiation. Through a series of controlled experiments and related characterizations, the notably enhanced catalytic performance of Pt@CdS/3DOM-SrTiO 3 composites can be mainly attributed to the synergistic effect of the slow photon enhancement of 3DOM-SrTiO 3 , which significantly promotes the light harvesting efficiency of photocatalysts, and the enhanced separation of photogenerated carriers because of the Z-scheme charge transfer mechanism. In addition, the ternary Pt@CdS/3DOM-SrTiO 3 catalysts are very stable and can be recycled five times without any decrease in photocatalytic activity.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Zhang,Yimeng Cao,Fang Chen,Mengdie Cai,Jia-qi Bai,Jiawei Xue,Jingshuai Chen,Chang-Jie Mao,Song Sun
Cocatalysts play a pivotal role in enhancing the efficiency of photocatalytic water splitting. In this study, we introduced a novel and straightforward pre-impregnation strategy to anchor a CuNi dual cocatalyst onto the surface of Al-doped SrTiO 3 (Al-STO), coupled with photodeposition. This approach led to a remarkable 11.07-fold (77.5 µmol/h) increase in hydrogen evolution performance compared to the conventional photodeposition method for decorating with CuNi dual cocatalysts. Not only that, after the 18 h cycle experiment, the catalyst still maintains high activity and high stability similar to that of precious metals, which overcomes the defects of poor stability and short life of non-precious metals. This strategy capitalizes on the pre-adsorption of cocatalyst precursor ions on the Al-STO support via impregnation, enhancing both the adsorption energy and capacity between the precursor ions and the active sites. Detailed characterizations have revealed a strong electronic interaction within the Cu-Ni structure and improved interfacial coupling between CuNi and Al-STO. This not only significantly promotes charge separation and transfer but also provides a plethora of active sites for the photocatalytic generation of H 2 . Moreover, extensive theoretical calculations have provided deep insights into the reaction mechanism of the CuNi system and elucidated the reasons behind the varying degrees of activity enhancement across different cocatalyst architectural systems.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mingjie Zheng,Zhixing Chen,Yongkun Lun,Bin Liu,Wangjian Zhai,Qinyu He
Degrading the A-ring of tetracycline (TC) requires a photocatalyst with either a very negative conduction band edge (CBE) or a very positive valence band edge (VBE). In this work, a SrTiO 3 -based composite with a Sr/W ratio of 7.5% (CSWT75) was prepared by hybridizing the following components: n-type semiconductor Sr 2 WO 5 with CBE of –2.10 V, n-type semiconductor SrWO 4 with a VBE of 4.42 V, and p-type semiconductor Sr 3 WO 6 with CBE of–1.26 V, resulting in formation of z-scheme and p-n heterojunctions. Over CSWT75, the photodegradation rate of the B, C, and D rings of TC was 100% in 60 min and that of A ring was 98% in 90 min. The reaction rate constant of CSWT75 was found to be 3.4-fold that of the as-prepared pure SrTiO 3 . It is found that a high positive VBE potential like that of SrWO 4 4.42 V is more effective on degrading A-ring than a negative CBE potential −0.81 of SrTiO 3 , but less effective than a negative CBE potential −1.26 V of Sr 3 WO 6 . This study identified two new semiconductors with highly negative CBEs. This work also implys that a z-scheme structured composite hybridizing homeotype-semiconductors with very negative CBE favors in degrading A ring of TC.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guibin Zhang,Xin Wang,Yaqian Du,Jun Wang,Xuebing Yang,Ta La,Jianbo Li
SrTiO3 exhibits promising potential in both thermoelectric and optical properties. However, research on these two properties has consistently been carried out in two relatively independent fields. In this work, the regulatory mechanisms of thermoelectric and optical properties were proposed based on photon-excited electron–phonon interactions. Er doping can enhance the photon absorption of SrTiO3 by introducing impurity energy levels, thereby promoting photoexcited electron generation. The introduction of oxygen vacancies (Vo) enhances the interaction between excited electrons and phonons through defect levels, facilitating the conversion of photon energy into thermal energy and subsequently into electrical energy. Additionally, Er–Nb codoping with Vo synergistically optimizes thermoelectric properties, thereby laying a foundation for the regulation of photothermoelectric properties. As a result, significant photothermoelectric conversion was obtained in the Sr0.85Er0.15Ti0.9Nb0.1O3 (Vo) sample. A maximum ZT value of 0.32 at 1073 K was achieved in this sample, representing a 60% improvement over previously reported Nb-doped SrTiO3 samples. The electrical output power of the Sr0.85Er0.15Ti0.9Nb0.1O3 (Vo) sample reaches 3.85 μW under portable 980 nm laser excitation at 260 mW incident power. These findings provide valuable insights into the conversion of light energy to electrical energy in highly absorptive SrTiO3-based thermoelectric materials.
研究领域:
材料科学
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热电学
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光电子学
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能量转换
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固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 8
·4049-4057
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IF 3.784
Guanhua Song,Faqiang Zhang,Feng Liu,Zhifu Liu,Yongxiang Li
SrTiO 3 -modified lead-free piezoelectric ceramics, (0.93- x )Bi 0.5 Na 0.5 TiO 3 - x SrTiO 3 -0.06BaTiO 3 -0.01 K 0.5 Na 0.5 NbO 3 [(BNT- x ST)-BT-KNN, x = 0-0.06], were prepared using a conventional solid-state reaction method. The XRD structure analysis and electric properties characteristics revealed the ST-induced phase transformation from the ferroelectric phase to the relaxor phase and their coexistence state. Benefiting from the ST-destructed ferroelectric long-range orders, the high normalized strain value of 600 pm/V was obtained in the (BNT-0.02ST)-BT-KNN ceramic at 5 kV/mm. The ST-generated relaxor phase was found to have a constructive effect on improving the temperature stability and restraining the hysteresis of the electric-field-induced strain. The normalized strain of (BNT-0.06ST)-BT-KNN ceramics could be kept at a high value ~337 pm/V at elevated temperature up to 120°C.
研究领域:
材料科学
·
陶瓷
·
压电材料
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电陶瓷
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Haowei Lu,Jiaqi Lin,Haiwu Zheng
The ferroelectric properties and fatigue resistance of 47(Ba 0.7 Ca 0.3 )TiO 3 –53Ba(Zr 0.2 Ti 0.8 )O 3 (BCZT) film can be enhanced by Tb modified and adding SrTiO 3 (STO) buffer layer using pulsed laser deposition(PLD) method. The 0.4 mol% Tb doped BCZT/STO(0.4Tb-BCZT/STO) film possesses optimal comprehensive electrical properties. Comparing with traditional BCZT film gown on Pt, the residual polarization( P r ), piezoelectric coefficient( d 33 *), permittivity( ε r ) of 0.4Tb-BCZT/STO film increase from 3.6 to 9.0 μC/cm 2 , 52 to 75 pm/V, 880 to 1210 and loss(tanθ) decrease from 0.028 to 0.017(10 4 Hz), respectively. During a high electric field, the degradation of P r is only 5.8% and the increase of E c is about 6.1% in 0.4Tb-BCZT/STO film after 10 9 switching cycles, which show the excellent fatigue resistance. The improved polarization and fatigue performances of film benefits from the reduced pinning influence with lower defect concentration based on a series of experiments and theoretical simulation. This work demonstrates the potential candidates of lead-free nonvolatile memory micro-devices applied in microelectronic industry.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Bianbian Zhou,Renke Bi,Yijie Shen,Yan Wang,Jialong Liu,Bing Han,Zhiyu Wang
Enhancing the photocatalytic performance of SrTiO3 through bandgap modification via nitrogen doping is a widely used approach. However, our study reveals that N-doped SrTiO3 may exhibit additional mechanisms contributing to its improved performance. In this study, SrTiO3 was synthesized via a hydrothermal method. N doping significantly improved the photocatalytic efficiency of SrTiO3 in water splitting, with average hydrogen and oxygen production rates of 36.79 μmol h–1 and 18.66 μmol h–1, respectively, which is approximately 3.4 times higher than that of pure SrTiO3. First-principles calculations combined with diffuse reflectance spectroscopy demonstrated that under conventional doping conditions, N doping does not lead to a reduction in the bandgap of SrTiO3, indicating that the primary reason for the enhanced photocatalytic activity differs from that of N-doped TiO2 and is not due to an enhanced response to visible light. Further studies showed that upon introduction of nitrogen into the SrTiO3 lattice, the difference in electronegativity between N and O increased the charge density around the Ti 3d orbitals, causing an upward shift in the Fermi level, increased the depletion layer thickness, and promoted carrier transport and separation. This suggests that the primary reason for the performance improvement may be the enhanced efficiency of carrier transport and separation. This finding could contribute to a more comprehensive understanding of the effects of nonmetal ion doping on the properties of SrTiO3 and its potential applications.
研究领域:
材料科学
·
催化
·
物理化学
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固体物理
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Wenli Song,Bing Zhang,Wenli Zhou,Jilin Zhang,Liping Yu,Shixun Lian
All-inorganic perovskite quantum dots (PQDs, CsPbX3, X = Cl, Br, and I) show outstanding application prospects in the field of photoelectric devices. In recent years, the development of PQDs has greatly improved their stability to water, oxygen, and light. However, thermal quenching of PQDs greatly limits their practical application. Herein, we embed PQDs into ATiO3 (A = Ca, Ba, and Sr) of three different mesoporous spherical structures to explore the effect on thermal quenching of PQDs. Because of the unique mesoporous hollow microsphere structure and low thermal conductivity of SrTiO3, it can effectively block the heat transfer and improve the thermal quenching of PQDs. The photoluminescence (PL) intensity of CsPbBr3@SrTiO3 composites is 72.6% of the initial intensity after heating to 120 °C. Moreover, the PL intensity of CsPbBr3@SrTiO3 composites remains about 80% of the initial value even when stored in air for 20 days or irradiated by 365 nm UV light for 48 h. A neutral white light-emitting diode is assembled by a blue chip, CsPbBr3@SrTiO3 composites, and red phosphor of K2SiF6:Mn4+, which has a color temperature of 5389 K and a color gamut covered 133% of National Television Standards Committee (NTSC).
研究领域:
材料科学
·
纳米技术
·
光电
✓ 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）