Journal of Energy Chemistry
·
2019
·
IF 5.162
Meng Zhang,Xuezhang Xiao,Bosang Luo,Meijia Liu,Man Chen,Lixin Chen
Magnesium hydride has been seen as a potential material for solid state hydrogen storage , but the kinetics and thermodynamics obstacles have hindered its development and application. Three-dimensional flower-like TiO 2 @C and TiO 2 were synthesized as the catalyst for MgH 2 system and great catalytic activities are acquired in the hydrogen sorption properties. Experiments also show that the flower-like TiO 2 @C is superior to flower-like TiO 2 in improving the hydrogen storage properties of MgH 2 . The hydrogen desorption onset and peak temperatures of flower-like TiO 2 doped MgH 2 is reduced to 199.2 °C and 245.4 °C, while the primitive MgH 2 starts to release hydrogen at 294.6 °C and the rapid dehydrogenation temperature is even as high as 362.6 °C. The onset and peak temperatures of flower-like TiO 2 @C doped MgH 2 are further reduced to 180.3 °C and 233.0 °C. The flower-like TiO 2 @C doped MgH 2 composite can release 6.0 wt% hydrogen at 250 °C within 7 min, and 4.86 wt% hydrogen at 225 °C within 60 min, while flower-like TiO 2 doped MgH 2 can release 6.0 wt% hydrogen at 250 °C within 8 min, and 3.89 wt% hydrogen at 225 °C within 60 min. Hydrogen absorption kinetics is also improved dramatically. Moreover, compared with primitive MgH 2 and the flower-like TiO 2 doped MgH 2 , the activation energy of flower-like TiO 2 @C doped MgH 2 is significantly decreased to 67.10 kJ/mol. All the improvement of hydrogen sorption properties can be ascribed to the flower-like structure and the two-phase coexistence of TiO 2 and amorphous carbon . Such phase composition and unique structure are proved to be the critical factor to improve the hydrogen sorption properties of MgH 2 , which can be considered as the new prospect for improving the kinetics of light-metal hydrogen storage materials.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1334
·
IF 4.501
Fujian Lv,Yingchun Miao,Didi Yang,Bing Mao,Zhenfeng Bian,Fengxia Zhu
The adsorption-enhancing TiO2-SBA-15 photocatalyst has been synthesized by an in situ etching displacement method, which possesses unique regular hexagonal pores and large specific surface area. The as-prepared TiO2-SBA-15 can effectively adsorb and increase the concentration of pollutants in the photocatalyst and collision likelihood with the photogenerated radicals, thus improving the efficiency of photocatalytic organic degradation. The structure and morphology have been characterized by N2adsorption isotherms, X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and scanning electron microscopy (SEM). These characterizations confirm that TiF4alcohol solution prefers to react with the internal surface of SBA-15 because of the Siphon effect. Fourier transform infrared (FTIR) spectra demonstrate that a Ti-O-Si bond formed after the reaction of TiF4with SBA-15, which reveals a wonderful combination of TiO2and SiO2even at low temperatures. Through this function, the nanocomposite TiO2-SBA-15 could obviously improve the efficiency of photocatalytical removal of toluene in the gas phase.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 2
·291-301
·
IF 1.986
Ji Lijun,Qin Xiang,Zheng Jingjing,Zhou Shu,Xu Tong,Shi Guojun
Ag–Carbon–TiO 2 composite tubes were prepared by using polystyrene/AgNO 3 composite fibers as a sacrifice template and a co-pyrolysis process. The Ag–Carbon–TiO 2 tubes were characterized by SEM, TEM, X-ray diffraction, Raman spectrum, XPS, and UV–vis spectrum. The results showed that the Ag–Carbon–TiO 2 tubes possessed uniform tubular structure with amorphous carbon, graphitic carbon, and Ag nanoparticles (AgNPs) distributing uniformly in TiO 2 . The Ag–Carbon–TiO 2 tubes were confirmed high UV–vis light utilization and photocatalytic degradation efficiency to Rhodamine B due to the carbon doping, the surface plasmon resonance of AgNPs and the tubular structure, and the degradation of Rhodamine B reached 90% in 6 h. Meanwhile, they showed an excellent antibacterial effect on staphylococcus aureus, and the fatality rate of Ag–Carbon–TiO 2 tubes to staphylococcus aureus reached 99.9% in 24 h when its concentration was higher than 4 mg/ml. The co-pyrolysis process could repress the AgNPs to grow to be large particles, which could be a key for the excellent antibacterial property. The research showed a promising strategy for preparing Ag–Carbon–TiO 2 composite tubes by co-pyrolysis of PS composite electrospinning fibers, indicating their potential application in wastewater treatment and antibacterial materials.
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高影响因子
Energy Materials
·
2024
·Vol. 4
·期 3
·N
·
IF 11.8
Ming Zhang,Pingping Yang,Wenyan Tao,Xiangui Pang,Youyi Su,Pai Peng,Lin Zheng,Runhan Li,Shuxiang Wang,Jing Huang,Li Zou,Jiale Xie
Due to the excellent stability of titanium dioxide (TiO2), there is still value in improving its solar-to-hydrogen conversion efficiency through tremendous attempts. Metal sulfides with a narrow bandgap are good candidates to broaden the ultraviolet light absorption of TiO2 into the visible light region. However, sulfides suffer from the photocorrosion issue, leading to poor stability. Herein, a type-II heterojunction of TiO2/In2S3 is fabricated by a hydrothermal method, and a NiFe Prussian blue analog (NFP) overlayer is deposited on the surface of TiO2/In2S3 through a chemical bath deposition technique. Under AM1.5G illumination, a photocurrent density of 1.81 mA cm-2 can be obtained with NFP coated TiO2/In2S3 at 1.23 V vs. reversible hydrogen electrode, which is six folds of the photocurrent of TiO2. This photocurrent value can reach up to about 90% of its theoretical photocurrent. During a 12 h stability test, the TiO2/In2S3/NFP photoanode exhibits a high photocurrent retention of 95.17% after an initial transient decrease. The type-II heterojunction of TiO2/In2S3 can efficiently boost the charge separation because of the built-in electric field and enhance the visible-light absorption because of the narrow bandgap of In2S3. A NFP overlayer serves as the cocatalyst for water oxidation reaction due to its valence changes of nickel and iron elements. NFP cocatalyst can rapidly extract the photogenerated holes from In2S3 and then improve the charge separation/injection efficiencies. Thanks to chemical stability of NFP, its coating can also make In2S3 resistant to photocorrosion by physically separating the photoanode from the electrolyte. Therefore, there is a good synergistic effect between the TiO2/In2S3 heterojunction and NFP cocatalyst. This work provides some crucial insights for the interface engineering and material design in photoelectrochemical systems.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Chenjie Dong,Guansheng Li,Jiajing Zhu,Jie Cui,Liangjun Huang,Hui Wang
MgH 2 is a high-density hydrogen storage material but requires an efficient catalyst to improve its poor kinetics and reduce high operating temperature. TiO 2 is a widely used photocatalyst for water splitting and hydrogen production, and has also demonstrated catalytic ability in the gas-solid reaction of MgH 2 . In this study, we synthesize the Ni-doped TiO 2 nanoparticles, which significantly reduce the hydrogen absorption temperature down to subzero temperatures. The milled composite of MgH 2 with 10 wt% Ti(5Ni)O 2 can absorb 5.25 wt% H 2 within 30 s at 25 °C, 4.30 wt% H 2 within 50 s at 0 °C, and 3.94 wt% H 2 within 50 s even at a low temperature of −30 °C. This composite can release 6.04 wt% of hydrogen in 3 min at 250 °C, and the dehydrogenation activation energy is reduced to 74.57±1.36 kJ/mol, a notable reduction in comparison to that observed in pure MgH 2 . This study demonstrates the potential of the modified TiO 2 as an important kind of catalyst for solid-state hydrogen storage materials.
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高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 60
·期 15
·2269-2279
·
IF 0
Mi Ouyang,Dacheng Dai,Xuming Hu,Yuwen Li,Zhangxin Chen,Bowen Tao,Lina Zhang,Weijun Li,Yujie Dong,Ru Bai,Xiaojing Lv,Cheng Zhang
A new star-shaped structure conjugated microporous polymers, poly (2,8,14-tri[4-diphenyl-benzene]-hexaazatrinaphthylene) (PTPA-HATN), was designed and in-situ electrochemically polymerized on the surfaces of FTO electrodes with a directional alignment TiO 2 nanorod array to obtain TiO 2 /PTPA-HATN core-shell nanocomposite films. Compared with the PTPA-HATN film, the TiO 2 /PTPA-HATN composite film exhibits higher optical contrast and faster response time, with contrast of 57% at 783 nm, coloring time of 3.62 s and discoloring time of 2.55 s (43%, 4.63 s and 4.77 s for PTPA-HATN film, respectively). After 400 cycles, the contrast of nanocomposite film decreased by 28%, while the PTPA-HATN film basically lost its electrochromic properties. A simple three-layer EC prototype device based on TiO 2 /PTPA-HATN nanocomposite film constructed with hydrogel electrolyte clearly shows color changes at different voltages. On the one hand, the formation of core-shell porous nanostructure of TiO 2 /PTPA-HATN composite film provides a larger ion doping/de-doping interface, shortening the average diffusion length of ions. On the other hand, the large indented polymer-nanorods contact interface makes it difficult for the polymer to detach from the electrode, thus significantly improving the cyclic stability of the composite film. Graphical
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PHYSICA SCRIPTA
·
2023
·Vol. 99
·期 1
·015526
·
IF 2.9
Tao Zhang,Siyu Cai,Nina Liang,Yalei Gao,Yuanpeng Li,Fuchi Liu,Lizhen long,Jun Liu
Zero-dimensional (0D) and one-dimensional (1D) mixed heterostructure semiconductors can bring superior electrical and optoelectronic performances due to the synergistic advantages of different dimensionalities. Here, a metal-semiconductor–metal (MSM) ultraviolet (UV) photodetector based on 1D-0D TiO2/CsPbBr3 heterostructure semiconductor is constructed, which exhibits excellent photodetection performance. A back-to-back Schottky contact is formed in the MSM (Au/TiO2/Au) structure due to the large band-energy bending resulted from the abundant surface-states at 1D-TiO2 surface. Under an applied voltage, a small saturation current flows through the device. Benefiting from the decoration of CsPbBr3 QDs, the dark current of MSM photodetectors can be further suppressed, and producing the improved on/off ratio (Ilight/Idark), photoresponsivity (Rλ), and detectivity (D*). PL properties study suggested that an energy transfer is occurred between the 0D-CsPbBr3 and 1D-TiO2. The TiO2/CsPbBr3 heterojunctions are beneficial for photo-induced charge transfer in hetero-interface because of the type-II energy-band alignment, but not non-radiative energy transfer from 0D-CsPbBr3 to 1D-TiO2. On the whole, this study depicts a fascinating coupling architecture of mixed-dimensional materials toward implementing low-cost and high-performance optoelectronic devices.
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高影响因子
Russian Journal of Physical Chemistry A
·
2026
·Vol. 100
·期 10
·2542-2555
·
IF 0.7
Lili Li,Li Jiaxin,Ma Yuyu,Shu Jing
The Ce-UiO-66-NH 2 material was successfully prepared by oil bath method, and TiO 2 and PANI were compounded on the basis of it, which improved the degradation efficiency of rhodamine B (RhB). XRD, TEM, and XPS characterization confirmed that the composite material formed a core-shell structure and polyaniline was uniformly coated. The composite with 20 μL aniline and CTAB surfactant showed the highest degradation efficiency, and the degradation rate of RhB reached 99.90% within 60 min under ultraviolet light irradiation. The band alignment and free radical trapping experiments show that it follows the ternary Z-type heterojunction mechanism, \( \bullet {\kern 1pt} {\text{O}}_{2}^{ - }\) is the main active species. It provides a new idea for the design of high-performance photocatalysts and is of great significance for promoting the application of photocatalytic technology in water pollution control.
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 24
·12150-12155
·
IF 6.233
Shunxing Li,Jie Chen,Fengying Zheng,Yancai Li,Fuying Huang
A novel double-shell TiO2 hollow sphere with an inner anatase shell and an outer rutile shell was synthesized by a simple sol–gel method and silica protected calcination process. The structure and formation mechanism was proposed based on characterization using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The double-shell spheres have a uniform diameter of 360 nm and a typical yolk–shell structure. Moreover, the double-shell TiO2 hollow spheres possess a large specific surface area (169 m2 g−1). Due to the high surface area, multiple light reflection and beneficial electron conduction between the inner anatase and outer rutile shell of this special structure, the as-prepared double-shell TiO2 catalysts show remarkably enhanced photoactivity compared to the commercial P25 catalyst. In particular, rhodamine B molecules can be completely decomposed in the presence of the double-shell spheres after 60 minutes of irradiation with UV light. In addition, the high activity is retained after five cycles, indicating the stability and reusability of the double-shell catalyst.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 25
·66625-66637
·
IF 5.8
Zhang Jun,Xie Xujiao,Li Qing,Zhang Shuai,Wang Ji
The widespread use of nanoparticles (NPs) and organic pollutants increases the risk of their coexistence in the aquatic environments. It is uncertain how the combined toxicities of NPs and OCs affect aquatic organisms in surface waters. In this study, the binary combined toxicities of TiO 2 NPs with three different organochlorines (OCs)-pentachlorobenzene (PeCB), 3,3,4,4-tetrachlorobiphenyl (PCB-77), and atrazine on Chlorella pyrenoidosa in three karst surface water bodies were investigated. The correlation analysis results indicated that the toxicities of TiO 2 NPs and OCs to algae were mainly related to the total organic carbon (TOC) and ionic strength of surface water. Surface water relieved the growth inhibition of the pollutants on algae as compared with ultrapure water (UW). The combined toxic effect caused by the co-exposure of TiO 2 NPs-atrazine was synergistic and had an antagonistic effect for TiO 2 NPs-PCB-77 in four types of water bodies. However, the co-exposure of TiO 2 NPs-PeCB had an additive effect in the Huaxi Reservoir (HX) and synergistic effects in Baihua Lake (BH), Hongfeng Lake (HF), and UW. TiO 2 NPs increased the bioaccumulation of OCs by algae. Both PeCB and atrazine significantly increased the bioaccumulation of TiO 2 NPs by algae, except for PeCB in HX; however, PCB-77 reduced the bioaccumulation of TiO 2 NPs by algae. The toxic effects of TiO 2 NPs and OCs on algae in different water bodies were the result of the nature of the pollutants, bioaccumulation, hydrochemical properties, and other factors. Graphical abstract
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 97
·期 5
·1267-1274
·
IF 3.174
Ganning Zeng,Chunxian Hong,Yuan Ma,Mingming Du,Yan Zhang,Hongwei Luo,Bing Chen,Xiangliang Pan
BACKGROUND During the past two decades, aquatic polycyclic aromatic hydrocarbon (PAH) contamination has gained more and more attention, because of carcinogenicity or mutagenicity, toxicity, persistence and bioaccumulation, and a huge threat posed to entire ecosystems. RESULTS Sargassum horneri ( SH )-based carbon was pretreated with ethanol and formaldehyde, and obtained after pre-carbonization using H 2 SO 4 . The SH carbon powder was used to immobilize nano-TiO 2 in aquatic environment by a facile sol–gel method. The resulting C/TiO 2 catalyst was applied to photocatalytic aquatic naphthalene degradation under sunlight and showed the best naphthalene degradation performance of 83.77% under simulated sunlight, which could be attributed to the shape and structure contribution originating from SH . C/TiO 2 served as both adsorbent and catalyst in the degradation process of naphthalene, and the photodegradation process conformed to a double-exponential kinetic model, indicating that there are physical and chemical processes involved in the degradation. The mechanism for enhanced photocatalytic activity was verified as a synergistic mechanism resulting from SH -based carbon and TiO 2 , and showed industrial potential for removal aquatic PAH pollutants. CONCLUSIONS This study verifies that the synergistic effect resulting from SH -based carbon and TiO 2 enhanced the photocatalytic performance. © 2021 Society of Chemical Industry (SCI).
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高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2022
·Vol. 54
·期 8
·909-917
·
IF 1.702
Li Jian
In order to improve the surface wettability of carbon fiber and enhance its composite interface performance, dimethylamine treated TiO2 was coated on carbon fiber (CF). The surface morphology, surface chemical state, and surface wettability of CF were characterized by SEM, XPS, and TEM tests, and the interlaminar shear strength (ILSS) and cross-sectional morphology tests were used to test the performance of CF/Low density polyethylene (LDPE) composites. The interface bonding status was analyzed and characterized. The results show that after the surface treatment of CF by dimethylamine treated TiO2, the O/C (atomic ratio) of the surface of CF is increased, and a certain amount of nano-scale small convex micro-mechanical structure is given, which improves the surface wetting of CF. The surface of the CF modified by the TiO2 is rough; the contact area between modified CF and LDPE increases.
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高影响因子
危险品化学品经营许可证（带存储）