JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
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
·
光电化学
✓ 已验证
产品关联
DOI
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
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 9
·5707-5712
·
IF 1.093
Qian Yongteng,Li Kaidi,Wang Wenshuang,Wang Jinghui,Cheng Xuechun,Zhou Yalan,Du Jimin,Chen Huijuan,Zhang Bing,Kang Dae Joon
Porous photocatalysts have attracted significant attention for their large specific surface area, numerous surface catalytic active sites, and high photocatalytic activity. In this study, porous SrTiO3/TiO2 composites were successfully fabricated through a hydrothermal
approach utilizing porous TiO2 as a substrate. The as-synthesized SrTiO3/TiO2 composites were then characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy, Brunauer-Emmett-Teller (BET), and ultraviolet-visible
spectroscopy (UV-Vis) analysis. The results of SEM and BET indicate that such composites have a porous structure and large surface area. Compared to unadulterated TiO2, SrTiO3 /TiO2 composites exhibit higher photocatalytic performance for the photodegradation
of rhodamine B under UV-Vis irradiation. Additionally, it was found that when the content of SrTiO3 reaches 20%, it achieves the maximum photodegradation efficiency of 98.6% under UV-Vis irradiation over 60 min. These results demonstrate that SrTiO3/TiO2 composites
are a promising material in terms of environmental cleanliness.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Tingting Xu,Shulan Wang,Li Li,Xuan Liu
Semiconductor photocatalysis is considered as an effective sustainable technology to relieve the emerging global energy shortage issues, while how to design the efficient photocatalyst with enhanced light absorption, charge carrier separation and surface reaction is still a primary barrier for its applications. Herein, SrTiO 3 /TiO 2 /C (STC) heterostructure with tri-modal (micro-, meso-, macro-) pores integrated was synthesized via freeze casting combined with silica colloid as the hard template. Carbon was used as the photosensitizer for extending light absorption, electric field from SrTiO 3 /TiO 2 for enhancing charge carrier separation, and hierarchical pore structures for promoting surface reaction. Silica in different particle sizes was used to tune the pore structure of composites. The as-prepared STC sample reached the photocatalytic hydrogen production rate from water splitting as high as 2.52 mmol h −1 g −1 under UV irradiation, which is 1.5 times of benchmark catalyst P25. Its reactivity for methylene blue (MB) degradation is superior to the corresponding individual compositions and about 4.7 times of SrTiO 3 under UV light irradiation. The current work provides a feasible method to fabricate the hierarchical porous multi-component semiconductor based heterostructures with excellent photochemical performances, which develops our understanding for the design and fabrication of hierarchical porous catalysts.
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
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Lianqing Yu,Yanxing Liu,Lijie Duan,Yaping Zhang,Liana Alvares Rodrigues,D. Amaranatha Reddy,Haifeng Zhu
Construction of heterojunctions has been shown to be one of the most promising methods for the preparation of highly efficient catalysts, because it is feasible and effective for the separation of electron-hole pairs, prolonging the lifetime of photogenerated electrons. In this study, TiO 2 was grown on fluorine-doped tin oxide glass (FTO), and then a strontium source was added to obtain heterojunctions between SrTiO 3 and TiO 2 using in-situ ion exchange hydrothermal method. The in-situ grown SrTiO 3 /TiO 2 (TST) composite has a better absorption performance, a narrower band gap, and a lower carrier recombination rate compared to the pure TiO 2 sample, which improves the photoelectrochemical performance. The photocurrent density of TST-10 (hydrothermally treated for 10 h) has the largest value of 0.06 mA·cm −2 , which is about three times higher than that of pure TiO 2 . Then, the first-principles density functional theory (DFT) calculation was used to further explore the photocatalytic mechanism of TST. The exchange correlation energy was based on the Generalised Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional calculation method to study the electronic and optical properties of SrTiO 3 /TiO 2 heterostructures. The results show that the carrier transfer rate and the optical absorption coefficient of the material increase significantly after the establishment of the in-situ heterojunction. This study offers insight into the heterostructures’ interface significance on photocatalytic activity.
研究领域:
材料科学
·
光催化
✓ 已验证
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
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yixuan Zhang,Cong Liu,Ye Zhou,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Hollow double-shelled Ag@SrTiO 3 -TiO 2 with Z-scheme heterostructure was constructed for highly efficient photocatalytic reduction of nitrate to N 2 . The 3D finite-difference-time-domain analysis indicated that hollow double-shelled structure improved light harvesting due to multiple reflections. Photo-generated electrons transfer from SrTiO 3 to Ag 0 caused by electron sink effect were utilized to reduce nitrate, while photo-generated electrons of TiO 2 migrated to SrTiO 3 via transport bridge of Ti 3+ defects for electron–hole recombination. Such charge carriers migration pathway facilitated the construction of Z-scheme heterostructure, which enhanced charge separation yet still retained high redox powers. Both photogenerated electrons and CO 2 − played important role in photocatalytic denitrification. Furthermore, Ag 0 acted as co-catalyst which not only promoted photogenerated electrons transfer to nitrate but also enhanced nitrate conversion selectivity to N 2 . Combining the above advantages, nitrate removal rate and the nitrogen selectivity reached 97.2 % and 98.8 % within 60 min, respectively. Even after five cycles, it still remained satisfied photocatalytic activity and stability. In summary, this work proposed a feasible strategy to construct Z-scheme hollow double-shelled photocatalyst for efficient photocatalytic denitrification.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
研究领域:
材料科学
·
化学
·
环境科学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 78
·49759-49768
·
IF 3.108
Chaorui Xue,Shengliang Hu,Qing Chang,Ying Li,Xi Liu,Jinlong Yang
Anodized TiO2 nanotube arrays have important applications in the area of photocatalysis and biomedicine. In this study, with the aim of improving the photocatalytic and biomedical properties of TiO2 nanotube arrays, we prepared both single and double layer walled TiO2 nanotube arrays and subjected them to hydrothermal treatment in strontium acetate solution. It was found that fluoride doped SrTiO3/TiO2 nanotube arrays could be formed after hydrothermal treatment without the failure of the single and double layer walled structure. In the case of fluoride doped SrTiO3/TiO2 nanotube arrays with a double layer walled structure, doping of fluoride induced a visible light response, formation of SrTiO3 benefited the separation of photogenerated electron–hole pairs, and the double layer walled structure led to an enlarged surface area. Due to the synergetic effect of above three factors, the fluoride doped double layer walled SrTiO3/TiO2 nanotube arrays demonstrated the highest photocatalytic activity under ultraviolet, visible and simulated solar light irradiation. The degradation rates of methylene blue solution are 0.13 h−1, 0.26 h−1 and 0.53 h−1 respectively. Moreover, ability to induce hydroxylapatite formation on the surface was also examined through an immersing test in simulated body fluid. The results indicated that SrTiO3, doped fluoride and a double layer walled structure could stimulate the hydroxylapatite formation by providing a larger number of hydroxyl ions, hydroxyl radicals and reactive initiation sites, thus the fluoride doped double layer walled SrTiO3/TiO2 nanotube arrays also exhibited the best ability to form hydroxylapatite on the surface.
研究领域:
光催化
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 6
·1717
·
IF 2.175
Zhang Yan,Bu Yuyu,Yu Jianqiang,Li Ping
SrTiO 3 –TiO 2 heterojunction thin-film nanotube arrays (SNTs, the average inner diameter is about 50 nm) was fabricated via electrochemical anodization followed by a hydrothermal treatment. The photo-to-current conversion properties and the photoelectrochemical performance for cathodic protection of carbon steel in 0.5 M of sodium chloride solution under white light illumination were investigated. The results showed that the highly ordered nanotube arrays could provide very excellent cathodic protection for carbon steel under white light irradiation.
研究领域:
材料科学
·
电化学
·
纳米技术
·
腐蚀防护
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2019
·Vol. 13
·期 4
·342-351
·
IF 1.701
Yang Liuxin,Chen Zhou,Zhang Jian,Wang Chang-An
Heterostructure is an effective strategy to facilitate the charge carrier separation and promote the photocatalytic performance. In this paper, uniform SrTiO 3 nanocubes were in-situ grown on TiO 2 nanowires to construct heterojunctions. The composites were prepared by a facile alkaline hydrothermal method and an in-situ deposition method. The obtained SrTiO 3 /TiO 2 exhibits much better photocatalytic activity than those of pure TiO 2 nanowires and commercial TiO 2 (P25) evaluated by photocatalytic water splitting and decomposition of Rhodamine B (RB). The hydrogen generation rate of SrTiO 3 /TiO 2 nanowires could reach 111.26 mmol·g −1 ·h −1 at room temperature, much better than those of pure TiO 2 nanowires (44.18 mmol·g −1 ·h −1 )and P25 (35.77 mmol·g −1 ·h −1 ). The RB decomposition rate of SrTiO 3 /TiO 2 is 7.2 times of P25 and 2.4 times of pure TiO 2 nanowires. The photocatalytic activity increases initially and then decreases with the rising content of SrTiO 3 , suggesting an optimum SrTiO 3 /TiO 2 ratio that can further enhance the catalytic activity. The improved photocatalytic activity of SrTiO 3 /TiO 2 is principally attributed to the enhanced charge separation deriving from the SrTiO 3 /TiO 2 heterojunction.
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Exploration
·
2026
·
IF 30.4
Weiwei Wang,Chun Lu,Xiaoxiao Liu,Wenlong Yang,Jie Zhou,Chenyao Hu,Xin Li,Guangze Nie
Sonopiezo-mediated heterogeneous catalysis is a promising technology for efficient removal of organic pollutants from wastewater. Nevertheless, it is challenging in real water matrix with coexisting ions due to the rather-limited selectivity of reactive oxygen species if any. Herein, a sonopiezo-triggered singlet oxygen evolution system for selective removal of tetracycline hydrochloride (TCH) was rationally designed by SrTiO 3 -TiO 2 heterojunction with a TiO 2 -terminated SrTiO 3 S-scheme interfacial structure. SrTiO 3 -TiO 2 heterojunction exhibits a dramatically expanded piezoelectric constant ( d 33 ), which produces a synergistic effect on improving the separation and transfer efficiency of charge carrier for efficient TCH degradation. Moreover, SrTiO 3 -TiO 2 heterojunction presents a high sonopiezo-current, which attractively indicates that SrTiO 3 -TiO 2 heterojunction has a potential capacity of charge separation under sonopiezo initiation. Remarkably, the mechanism was identified as the continuous generating of singlet oxygen ( 1 O 2 ), in which the sonopiezo-generated electrons trigger the formation of superoxide anion radical (•O 2 − ) and its subsequent transformation to generate 1 O 2 by expending more sonopiezo-generated holes. These findings provided new insights towards developing nonradical system for effective and selective oxidation of electron-rich pollutants via sonopiezo-catalytic process.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）