NANOTECHNOLOGY
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2020
·Vol. 32
·期 1
·015706
·
IF 3.551
Qiao Yin,Zhenzhen Cao,Zhiyuan Wang,Jiaming Zhai,Mingliang Li,Li Guan,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
Photocatalytic degradation of pollutants has been proved to be an effective strategy for wastewater treatment. Herein, TiO2 nanoparticles were synthesized on a Ti3C2 matrix by in situ growth, forming Z-scheme TiO2@Ti3C2/Cd0.5Zn0.5S (TO/CZS) multilevel structured nanocomposites via one-step hydrothermal route. The effects of hydrothermal temperature and Cd0.5Zn0.5S content on microstructure and properties of composites were assessed. TO/CZS nanocomposites were probed into phase composition, morphological and optical properties with x-ray diffractometer, infrared radiation, scanning electron microscope and UV–vis reflective spectra. Following the hydrothermal reaction at 160 °C for 12 h, TiO2 nanoparticles of 30 nm in diameter were generated in situ on Ti3C2 lamina and Cd0.5Zn0.5S particles were evenly distributed on the Ti3C2 matrix. The photocatalytic activity of TO/CZS composites were evaluated, which found that degradation rate constant (k = 0.028 min−1) of TO/CZS-40 on Rhodamine B was 5.19 times that of pure TiO2 and 4.48 times that of Cd0.5Zn0.5S. Through anchoring Ti3C2 as an electron transition mediator and combination with TiO2 and Cd0.5Zn0.5S, the new Z-scheme between TiO2 oxidized by Ti3C2 and Cd0.5Zn0.5S establishes a multilevel structure of separating electron-hole pairs. This work demonstrates a valid way to control electrons and hole transfer directions efficiently through designing multilevel semiconductor structural designs.
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高影响因子
NANO
·
2018
·
IF 1.1
Yanan Li,Zhongmin Liu,Yaru Li,Yongchuan Wu,Jitao Chen,Yanjun Liu,Ping Na
The Bi 2 S 3 -TiO 2 -RGO composites were synthesized by a facile one-step hydrothermal method and applied for the photocatalytic degradation of Rhodamine B (Rh B) under the visible light. The Bi 2 S 3 -TiO 2 -RGO composites were characterized by transmission electron microscopy, X-ray diffraction, Raman and Fourier transform infrared spectrometer. The results indicated that the Bi 2 S 3 -TiO 2 -RGO composites were successfully prepared, and Ti-O-C and S-C bonds were existing among Bi 2 S 3 , TiO 2 as well as RGO. Furthermore, the photocatalytic ability of Bi 2 S 3 -TiO 2 -RGO composites was excellent under visible light due to its responding to the whole visible light region, low recombination rate of photogenerated electron–hole pairs and relatively negative conduction band. Rh B photocatalytic degradation rate was 99.5% after 50 min and still could reach 98.4% after five cycles. Finally, a formation mechanism as well as a photocatalytic mechanism of Bi 2 S 3 -TiO 2 -RGO composites were proposed based on the experimental results.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Jie Yu,Yuan Zhang,Jiahao Chen,Lele Cui,Wenheng Jing
A solvothermal-induced assembly of a 2D-2D reduced graphene oxide (rGO)-TiO 2 mesoporous material with a laminar structure for membrane construction is reported, in which using 2D-2D rGO-TiO 2 as building blocks can preeminently enhance the separation properties of the as-prepared membrane without sacrificing the permeance. Taking advantage of the large specific surface area (324 m 2 /g) available for interfacial effects as well as interwoven stacking and narrow layer spacing of 2D morphologies for size exclusion, the fresh rGO-TiO 2 membrane exhibited excellent separation performance toward organic dye from water (>97.3% for Rhodamine B, Methyl orange, Methyl blue and Congo red), while achieving good permeance up to approximately 9.36 L m −2 h −1 bar −1 and an outstanding structural stability under the cross-flow process of filtration. More importantly, the reduced band gap energy (Eg) of 2D-2D rGO-TiO 2 membrane layer (2.77 eV) compared with that of the blank TiO 2 membrane (3.24 eV) allows the rGO-TiO 2 membrane to have an impressive self-cleaning ability and thus exhibits great potential application in the field of membrane separation .
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高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Rui Wang,Cong Tang,Ming Zhang,Zhecun Guan,Huanwen Wang,Yansheng Gong,Beibei He
TiO 2 is recognized as a promising anode material for sodium-ion batteries (SIBs) due to its low-cost and high structural stability, but it suffers from intrinsically poor electrical conductivity and low electrochemical activity at high rates. Herein, an in-situ Fe-doping strategy is designed to increase sodium-ion storage performance of TiO 2 /carbon nanofibers by a simple electrospinning method. The combination of Fe-doping with one-dimensional carbon structure could enable fast electron and Na + ion transport of TiO 2 . As a result, the Fe-TiO 2 /carbon nanofiber electrode exhibits high specific capacity (283 mAh g −1 at 0.5 C), excellent rate capability (140 mAh g −1 at 30 C) and long cycling stability (98% retention after 3000 cycles), which is obviously superior to pure TiO 2 /carbon nanofiber and other TiO 2 -based anodes reported in the literatures. These results indicates the powerful effect of in-situ Fe-doping for enhancing the Na-storage property of TiO 2 .
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Aleksei Chalgin,Wenlong Chen,Qian Xiang,Yi Wu,Fan Li,Fenglei Shi,Chengyi Song,Peng Tao,Wen Shang,Jianbo Wu
The urgent need of catalysts with improved performances toward the hydrogen evolution reaction (HER) is still one of the crucial issues for the water splitting electrocatalysis. Herein, we exhibit that the HER activity of the Pd nanocubes could be improved by selecting the appropriately shaped titania nanocrystals as support. In particular, we used Pd nanoparticles with (100)-facet exposed to show that the HER performance of Pd cubes can be improved in both acidic and alkaline electrolyte media when combined on the anatase TiO2 nanocrystals. Furthermore, we have also investigated the facet effect of TiO2 on the performance in detail, which indicated stronger catalytic activity when (001)-TiO2 was used rather than (mix 101/001)-TiO2 and (101)-TiO2. The electron-transfer-induced improvement of HER activity of Pd/TiO2 was assessed by electron energy loss spectroscopy (EELS). Thereafter, the combined support materials with suitable facet exposed can give an additional adjusting path to regulate the HER activities of Pd nanocatalysts, which henceforth can further contribute to a novel way for tuning other catalysts with good electrocatalytic properties.
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高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yao Liu,Wen-Bei Yu,Bai-Xiang Xu
Coating the carbon layer onto the surface of TiO 2 electrode is seen as an effective strategy to improve the electrochemical performance of lithium-ion batteries , particularly the reduced charge transfer resistance . The reduced charge transfer resistance was attributed to the chemical bonding between the phases. In this paper, however, we show that it is not only the chemical bonding but also the change of the activation energy differences that is responsible. Herein, we fabricate the carbon layer coated TiO 2 electrode (TiO 2 /C) and combine the recently proposed modified Planck-Nernst-Poisson coupled Frumkin-Butler-Volmer (MPNP-FBV) model to address the above-mentioned issues. By combining the experimental results with the electrochemical model, the charge transfer resistance and the interface behaviors are analyzed. The results show that the performance of TiO 2 /C electrode based cells is determined by the carbon layer/TiO 2 interface, while the cells based on TiO 2 electrodes are limited by the electrolyte/TiO 2 interface. Comparison between the electrochemical simulations and the experimental data indicates that this increased activation energy difference leads to the decrease of the charge transfer resistance. These results imply that activation energy difference across the interfaces can be a critical parameter for designing high performance batteries .
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高影响因子
Journal of Materiomics
·
2015
·
IF 0
Junwei Fu,Shaowen Cao,Jiaguo Yu
Photocatalytic hydrogen generation is one of the most promising solutions to convert solar power into green chemical energy. In this work, a multi-component TiO 2 –Ag–Cu 2 O composite was obtained through simple impregnation-calcination of Cu 2 O and subsequent photodeposition of Ag onto electrospun TiO 2 nanotubes. The resulting TiO 2 –Ag–Cu 2 O photocatalyst exhibits excellent photocatalytic H 2 evolution activity due to the synergetic effect of Ag and Cu 2 O on electrospun TiO 2 nanotubes. A dual Z-scheme charge transfer pathway for photocatalytic reactions over TiO 2 –Ag–Cu 2 O composite was proposed and discussed. This work provides a prototype for designing Z-scheme photocatalyst with Ag as an electron mediator.
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Nano Energy
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2012
·
IF 0
Chenbo Wang,Zifei Jiang,Lin Wei,Yanxue Chen,Jun Jiao,Micah Eastman,Hong Liu
We combine CdS semiconductor quantum dots and single-crystalline rutile TiO 2 nanorod arrays to produce a practical quantum dot sensitized solar cell . A facile wet-chemical approach was implemented for growth of this CdS@TiO 2 architecture. Rutile TiO 2 nanorod arrays with lengths of 1–2 μm and diameters of 40–60 nm were synthesized on fluorine-doped tin oxide glass by a hydrothermal process in a titanium tetrachloride precursor solution . CdS quantum dots with a size of 5–10 nm were deposited onto a TiO 2 nanorod surface using an ultrasonic-assisted chemical bath deposition method . The resulting CdS quantum dots and TiO 2 nanorods formed a type-II heterojunction and showed increased absorption over visible light range. Incident photon-to-current conversion efficiencies (IPCE) as high as 85% and power conversion efficiencies of 2.54% were obtained using a polysulfide electrolyte.
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FUEL
·
2017
·
IF 4.601
Shaojian Jiang,Xi Liu,Hailong Li,Jun Wang,Zequn Yang,Haoyi Peng,Kaimin Shih
Elemental mercury (Hg 0 ) oxidation over a low-temperature La 2 O 3 -TiO 2 (LaTi) catalyst through a fixed-bed reactor system is reported here. Despite the presence of oxygen (O 2 ), Hg 0 was not effectively oxidized by either hydrogen chloride (HCl) or nitrogen oxide (NO). However, Hg 0 oxidation over the LaTi catalyst was greatly improved when both HCl and NO were present in the simulated flue gas. Several methods, including X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, and temperature-programmed decomposition (TPD), were used to study the inherent mechanisms involved in the Hg 0 oxidation by HCl and NO. The results indicated that the combined presence of HCl and NO exhibited great synergy for Hg 0 catalytic oxidation over the LaTi catalyst. The reaction mechanism is proposed as follows: 1) NO was adsorbed and oxidized on the catalyst surface, forming NO 2 ; 2) the reactive NO 2 then oxidized gas phase Hg 0 to mostly HgO, and; 3) HgO reacted with gas phase HCl to produce HgCl 2 , which escaped from the catalyst’s surface. Differing from previously proposed mechanisms, La 2 O 3 was first studied as an active substance in Hg 0 oxidation. These findings are beneficial for those seeking economical and efficient Hg 0 oxidation catalysts for coal-fired power plants.
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高影响因子
Nano Research
·
2021
·Vol. 15
·期 3
·2013-2022
·
IF 8.897
Zhang Jining,Lei Yifan,Cao Shuang,Hu Wenping,Piao Lingyu,Chen Xiaobo
Photocatalytic water splitting (PWS) has attracted widespread attention as a sustainable method for converting solar to green hydrogen energy. So far PWS research has mainly focused on the development of artificial photocatalytic hydrogen production systems for pure water. It is more practically attractive to create systems for seawater, i.e., to reduce the cost of hydrogen production and make better use of naturally occurring water resources. Herein, brookite, anatase, and rutile TiO 2 nanoparticles are investigated as photocatalysts to explore the feasibility of such thought and have shown attractive hydrogen production performance under full solar spectrum without any sacrificial agent. It is worth noting that, brookite TiO 2 , has more suitable band gap position and excellent photoelectric properties compared with anatase and rutile TiO 2 , and has higher efficiency and stability in the process of hydrogen production. The photocatalytic hydrogen production rate of brookite TiO 2 can reach up to 1,476 µmol/g/h, the highest value reported for TiO 2 -based systems and most other photocatalysts in seawater splitting under full spectrum. As the Cl − ions in seawater go through a cycle of oxidation and reduction, no Cl 2 is detected in the solar hydrogen production from seawater.
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高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Jihong Jiang,Xiaobin Dong,Han Wang,Fengjuan Wang,Yali Li,Zeyu Lu
This study investigated the impact of natural sand supported nano-TiO 2 hydrosol (TiO 2 @Sand) on the mechanical and photocatalytic performance of cement mortar and the underlying mechanisms. The incorporation of TiO 2 @Sand in cement mortar (TiO 2 was 0.6 wt% of cement) improved 28-day compressive strength by 67% compared with the one without nano-TiO 2 . Various beneficial changes towards improved mechanical strength were also observed in TiO 2 @Sand cement mortar: reduced total porosity by 35%, densified interfacial transition zone (ITZ) microstructure, enhanced modulus of ITZ by 54%, reduced ITZ thickness by 40% and improved dispersion of TiO 2 . The degradation efficiency of Rhodamine B and NO by TiO 2 @Sand reinforced mortar was 40% and 25% higher than cement matrix with conventionally dispersed nano-TiO 2 powder, respectively. The significantly enhanced photocatalytic activity of the TiO 2 @Sand mortar was attributed to the expanded light absorption range, the reduced recombination of electron-hole pairs of TiO 2 @Sand, and the better dispersion of nano-TiO 2 in cement matrix. These results demonstrated the promising potential of using TiO 2 @Sand in cement mortar to deliver significant enhancement of both mechanical strength and photocatalytic activity.
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高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Fei Li,Ying Wang,Ri-Sheng Bai,Xiao-Xue Wang,Ma-Lin Li,Ji-Jing Xu
The issue of cathode passivation during cycling resulting in rapid capacity fading and premature battery death is a major challenge that hinders the applications of lithium–oxygen (Li–O 2 ) batteries. Here, a facile strategy of introducing a functional separator based on flexible amination SiO 2 /TiO 2 inorganic woven film (STON WF) is proposed to suppress the cathode passivation problem. The by-products, i.e. HCOOLi, CH 3 COOLi and Li 2 CO 3 can be selectively adsorbed on the STON WF separator preferably compared with the cathode and further proved by the density functional theory (DFT) calculations. Thus, benefiting from the separator, the Li–O 2 cells with super P carbon and catalyst-free cathode show enhanced electrochemical performance (5645 mA h g −1 at a current density of 200 mA g −1 ), good rate capability (discharge voltage of 2.43 V at a current density of 1.5 A g −1 ) and especially superior cycle stability up to 268 cycles. These findings present a promising approach to prevent the premature battery death.
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高影响因子
危险品化学品经营许可证（带存储）