MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Xiaoyun Chen,Dong-Hau Kuo,Dongfang Lu,Yongxuan Hou,Yen-Rong Kuo
Mesoporous TiO 2 was synthesized by a hydrolysis precipitation method with the utilization of the biological renewable resource of lignin as template and TiCl 4 as reactant. The photocatalytic activity of TiO 2 was investigated by the degradation of phenol under UV light irradiation. The microstructure, crystallinity , powder characteristic, and chemical bonding of the catalyst were analyzed. The 500 °C-calcined TiO 2 had average crystallite size of about 11.1 nm and a mesoporous structure with specific area of 165.8 m 2 /g and pore volume of 0.312 cm 3 /g. The results showed that TiO 2 synthesized with lignin template exhibited high photocatalytic activity, which can be attributed to the electronegativity and the network skeleton of lignin to uniformly distribute the TiO 2 precursor for forming TiO 2 mesoporous particles. The mechanism for the improved photodegradation of the lignin-assisted TiO 2 was proposed.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
光催化
·
绿色化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhongming Wang,Kun Wang,Xiaoying Peng,Qiang Geng,Xun Chen,Wenxin Dai,Xianzhi Fu,Xuxu Wang
The photoconductivity and the gas sensing property of TiO 2 at room temperature under ultraviolet (UV) irradiation were compared with those under visible light irradiation (≥420 nm), respectively. It was found that UV light could cause the photoconductivity of TiO 2 and its sensing response to both ethylene and oxygen, while the visible light at 420 nm could cause the photoconductivity of TiO 2 and its sensing response to oxygen but not to ethylene. This indicates that the photo-assisted gas sensing performance of TiO 2 was dependent on its light-excited behavior: The intrinsic excitation of TiO 2 induced by UV light could produce both the holes and electrons, which exhibited a respective response to ethylene and oxygen, while the extrinsic excitation of TiO 2 induced by visible light maybe only produced the free electrons but not free holes, resulting in only a response to oxygen. Furthermore, it was found that the visible-light enhanced conductivity maybe depend on the Ti–bonded hydroxyls (Ti–OH) at TiO 2 surface. With the removal of Ti–OH by increasing temperature, the visible light could not produce the photoconductivity of TiO 2 . It was proposed that Ti–OH groups act as the shallow trapped level to cause the extrinsic excitation of TiO 2 .
研究领域:
材料科学
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半导体物理
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传感器技术
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光化学
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表面科学
·
纳米材料
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Shuyue Yao,Yujie Ma,Tianhao Xu,Zhongyue Wang,Peng Lv,Jiajin Zheng,Chen Ma,Kehan Yu,Wei Wei,Kostya (Ken) Ostrikov
Carbon coatings hold great promise for next-generation non-conductive energy storage nanomaterials . However, simplicity, stable, uniformity and high-performance remain unresolved issues. Here, unique synergy of the fluidized bed reactor with plasmas enables highly-effective, single-step fluidized-bed plasma-enhanced chemical vapor deposition (FB-PECVD) of uniform, low-temperature carbon coatings on TiO 2 nano-powder (TiO 2 @C). Plasma-specific effects induce the formation of new phases that are beneficial for energy storage. The 6 nm carbon layer is grown within only 10 min, while the TiO 2 maintains its anatase phase. The unique plasma conditions make it possible to form Ti–C bonds at the Ti/C interface at much lower temperatures than achievable otherwise. The electronic transport at the interface and structural stability are thus greatly improved. Consequently, TiO 2 @C shows excellent electrochemical performances as a negative electrode of sodium ion battery , such as specific discharge capacity of 290.2 mA h g −1 at 50 mA g −1 and very stable long-term cyclability (101.2% capacity retention over 300 cycles at 4000 mA g −1 ). Our results show that FB-PECVD is not only a versatile method for bond-reinforced interface nanoparticle coating with carbon, but also provide a new strategy for designing hybrid-phase electrochemically active nanocomposite materials.
研究领域:
材料科学
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纳米科技
·
电化学
·
能源存储
·
无机非金属材料
·
表面工程
·
功能材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2021
·Vol. 40
·期 11
·3215-3221
·
IF 4.003
Yu Juan,Meng Bi-Cheng,Wang Le-Jie,Wang Qi,Huang Wen-Long,Wang Xu-Yang,Fang Zhao
Three-dimensional (3D) thin-film electrodes are promising solution to the volume change of active materials in lithium-ion batteries. As a conductive current collector, the 3D TiO 2 nanotube array networks (TNAs) have a one-dimensional stable electronic conductive path and increase the adhesion between the current collector and raw material, thereby improving the cycle stability of active materials. In this study, a novel 3D-TNAs@Sb 2 S 3 anode was fabricated by directly depositing natural stibnite onto 3D TNAs. The adhesion of Sb 2 S 3 particles to the substrate was enhanced due to the large surface area provided by 3D-TNAs. Moreover, the porous layered structure composed of Sb 2 S 3 nanoparticles relieved the stress generated during lithiation and adapted to the volume change of Sb 2 S 3 during cycling. Therefore, the resulting composite anode exhibits high cycle and rate performance, reaching 0.36 mAh·cm −2 after 80 cycles at the galvanostatic rate of 1 mA·cm −2 , with high coulombic efficiency of 98%.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
薄膜技术
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Jiuwang Gu,Javid Khan,Zhisheng Chai,Yufei Yuan,Xiang Yu,Pengyi Liu,Mingmei Wu,Wenjie Mai
Large surface area, sufficient light-harvesting and superior electron transport property are the major factors for an ideal photoanode of dye-sensitized solar cells (DSSCs), which requires rational design of the nanoarchitectures and smart integration of state-of-the-art technologies. In this work, a 3D anatase TiO 2 architecture consisting of vertically aligned 1D hierarchical TiO 2 nanotubes (NTs) with ultra-dense branches (HTNTs, bottom layer) and 0D hollow TiO 2 microspheres with rough surface (HTS, top layer) is first successfully constructed on transparent conductive fluorine-doped tin oxide glass through a series of facile processes. When used as photoanodes, the DSSCs achieve a very large short-current density of 19.46 mA cm −2 and a high overall power conversion efficiency of 8.38%. The remarkable photovoltaic performance is predominantly ascribed to the enhanced charge transport capacity of the NTs (function as the electron highway), the large surface area of the branches (act as the electron branch lines), the pronounced light harvesting efficiency of the HTS (serve as the light scattering centers), and the engineered intimate interfaces between all of them (minimize the recombination effect). Our work demonstrates a possibility of fabricating superior photoanodes for high-performance DSSCs by rational design of nanoarchitectures and smart integration of multi-functional components.
研究领域:
材料科学
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纳米技术
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光伏技术
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 6
·e70945
·
IF 4.2
Guowei Zhang,Zhen Yan,Zhanhui Peng,Qingqing Li,Qizhen Chai,Yuanhao Wang,Di Wu,Lingling Wei,Pengfei Liang,Zupei Yang,Xiaolian Chao
TiO 2 -based colossal permittivity ceramics with high dielectric constant and low loss have become one of the key candidates for high-capacity high-end capacitors. This study investigates the influence of oxygen vacancy concentration on the dielectric properties of TiO 2 -based ceramics by adjusting the acceptor-to-donor ratio, and finds that the (In x Nb 1− x ) 0.005 Ti 0.995 O 2 (INTO) sample with x = 1/3 exhibits ultra-low dielectric loss (tan δ) of 0.013 as well as high dielectric constant ( ε r ) of 1.7 × 10 4 (1 kHz). The results obtained from dielectric property measurements, relaxation behavior analysis, and X-ray photoelectron spectroscopy indicate that the high dielectric constant and low dielectric loss originate from the synergistic effect between oxygen vacancy-related defect clusters and electron-pinned defect dipoles. This work not only provides a new strategy for achieving colossal permittivity and ultra-low loss simultaneously via oxygen vacancy tailoring in TiO 2 -based ceramics and related materials, but also develops promising candidates for high-capacitance ceramic capacitors.
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DOI
高影响因子
Biomimetics
·
2026
·Vol. 11
·期 4
·261
·
IF 4.2
Lijun Zhou,Zhaoyue Tan,Xia Sheng,Xinjian Feng
The rational design and regulation of interfacial microenvironments represents an effective strategy for enhancing reaction performance. Previous studies have demonstrated that constructing air–liquid–solid triphase interfaces can substantially enhance catalytic reactions involving gaseous reactants. However, research on regulating the triphasic interfacial microenvironment remains limited and challenging. Herein, we fabricated a triphase photocatalytic system by depositing hydrophobic materials onto ordered TiO2porous (OTP), achieving significantly enhanced performance in visible-light-driven dye-sensitized photooxidation. Further, we regulated the triphasic microenvironment by systematically adjusting the chain length of hydrophobic molecules. It was found that the chain length greatly affects the interfacial properties, including O2concentration, the organic molecule adsorption and the interfacial electron transfer efficiency, thereby influencing photocatalytic reaction kinetics and pathways. We demonstrated a high-performance triphase photocatalytic system using 1H,1H,2H,2H-perfluorooctyl triethoxysilane as the hydrophobic material, which optimized multiple interfacial properties through synergistic effects, leading to optimal photocatalytic performance.
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DOI
PubMed
高影响因子
POLYMER
·
2023
·
IF 4.6
Tong Song,Man Liu,Jiaei Tian,Shiwei Wang,Qian Li
In this study, a method for preparing high expansion ratio, high cell density PLA foams based on a combination of titanium dioxide(TiO 2 ) and lignin(Lg) is demonstrated. TiO 2 can act as a rigid core to generate heterogeneous nucleated crystals and increase the strength of the PLA matrix, Lg can be used as a polymer plasticizer with good dispersibility to improve the mobility of PLA molecular chains and reduce the entanglement between molecular chains. By studying the competition and synergy of two nucleating agents in the nucleation process, Lg exhibits a significant nucleation-promoting effect compared to TiO 2 in the case of a single nucleating agent. While adding 5 wt% TiO 2 /Lg, the high content of TiO 2 /Lg provided the best synergistic effect to accelerate the overall crystallization. In addition, the 1 wt% PLA/Lg composite foams prepared in this work also exhibited excellent foaming properties.
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产品关联
DOI
高影响因子
WEAR
·
2023
·
IF 5
Shifan Li,Conglin Dong,Chengqing Yuan,Xiuqin Bai
Water-lubricated bearings play a vital role in improving the energy efficiency and environmental friendliness of ships. However, under the operating conditions such as start-stop and steering, the ship's stern bearing is often in boundary-lubricated or even dry friction condition due to the weak load-bearing capacity of the water film between the ship's drive shaft and the stern bearing. Therefore, the design of a polymer material with a low coefficient of friction and low vibration amplitude in both water-lubricated and dry friction conditions can greatly improve the stability and safety of the ship's operation. As a common reinforcing filler , TiO 2 nanoparticles have a notable enhancement effect on the tribological properties of lubricants. Therefore, in this paper, the tribological behaviors between UHMWPE matrix reinforced with TiO 2 nanoparticles and zirconia ceramic ball were investigated and the frictional vibrations during the friction process were analyzed. The results showed that TiO 2 generated a ball-bearing effect on the surfaces of the friction pair , which led to a smooth and flat wear surface and reduced the friction and vibration behaviors. The modified composite with 0.9 wt% TiO 2 exhibited the best tribological and vibration-absorbing properties in both water-lubricated and dry friction conditions. This study helps to provide a theoretical foundation for the design of marine water-lubricated bearing materials with excellent wear-resistance and vibration-reduction properties.
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jianhui Xu,Yufeng Liu,Dan Li,Chunhui Zhang,Xin Fu,Yunfei Zhang,Pengxu Wang,Jincheng Lu,Shenggui Chen,Lei Li
Electrocatalytic technology (EC) is a promising strategy for peroxymonosulfate (PMS) activation due to its environmental safety and energy conservation. Herein, 3D printed blue TiO 2 nanotube arrays (3DP-BTNAs) reactive electrochemical membranes (REM) were designed as anode and cathode in EC and EC/PMS systems. EC/PMS system displayed superior performance for acetaminophen (ACT) degradation and detoxication. The ACT degradation in EC/PMS system was 3.70 times faster than that in EC system. Quenching experiments suggested that singlet oxygen ( 1 O 2 ) mediated nonradical pathway was responsible for ACT degradation in EC/PMS system, while hydroxyl radical (•OH) was the predominant reactive oxygen species (ROS) in EC system. Our study first provided direct evidence that PMS activation on cathode was mainly triggered by superoxide radical (O 2 •- ). PMS was reduced by O 2 •- derived from O 2 reduction on cathode, and subsequently converted into ROS for organics oxidation . However, PMS tended to adsorb on anode and formed 3DP-BTNAs-PMS* complex for organics degradation. The influencing factors (e.g., PMS dosage, flow rate) on ACT degradation in EC/PMS system were evaluated, and the obtained optimal kinetic constant and lowest energy consumption were 0.135 min −1 and 0.27 Wh/L, respectively. In addition, eight degradation products were identified and possible degradation pathways of ACT were proposed to be the cleavage of C-N bonds and benzene ring. This study is dedicated to the rational design of highly porous REM material by 3DP technology for wastewater treatment and the in-depth mechanism of PMS activation over BTNAs electrode in EC/PMS system.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiayi Wang,Penggang Ren,Yanli Du,Xueyan Zhao,Zhengyan Chen,Lu Pei,Yanling Jin
Graphitic carbon nitride (g-C 3 N 4 ) is a promising photocatalyst with lots of merits, such as visible light driven (200–1000 nm), cost-effective and high stability. However, the single g-C 3 N 4 photocatalyst is limited in its performance due to the high complexation rate of photogenerated electrons and holes and the confined specific surface area. Herein, a S-scheme heterojunction catalyst involving tubular g-C 3 N 4 (TCN) and TiO 2 is designed and constructed via precursor reforming strategy with subsequent hydrothermal calcination process. The tubular structure offers more active centers, conducive to light absorption and contact with pollutants, while the heterojunction facilitates the transfer and separation of electrons and holes. Thus, the TCN/TiO 2 catalyst exhibits excellent photocatalytic activity with degradation efficiencies for methylene blue (MB) and tetracycline (TC) reaching 96.6 % and 100 %, respectively, as well as high degradation efficiency for other dyes (Congo red and Eosin y). Besides, TCN/TiO 2 catalyst demonstrates outstanding stability and potential for practical application. An innovative S-scheme heterojunction system has shown remarkable potential for improving the separation and transferring electron-hole pairs, as well as delivering stronger redox capability. This work provides a promising strategy for the preparation of g-C 3 N 4 /TiO 2 catalyst for the effective treatment of contaminated water.
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1945
·
IF 3.4
Yuan Chen,Feihong Liu,Yufei Zhao,Mengdie Ding,Juan Wang,Xuan Zheng,Huihu Wang,Marie-Christine Record,Pascal Boulet
In this study, lychee-like TiO2@Fe2O3microspheres with a core-shell structure have been prepared by coating Fe2O3on the surface of TiO2mesoporous microspheres using the homogeneous precipitation method. The structural and micromorphological characterization of TiO2@Fe2O3microspheres has been carried out using XRD, FE-SEM, and Raman, and the results show that hematite Fe2O3particles (7.05% of the total mass) are uniformly coated on the surface of anatase TiO2microspheres, and the specific surface area of this material is 14.72 m2g−1. The electrochemical performance test results show that after 200 cycles at 0.2 C current density, the specific capacity of TiO2@Fe2O3anode material increases by 219.3% compared with anatase TiO2, reaching 591.5 mAh g−1; after 500 cycles at 2 C current density, the discharge specific capacity of TiO2@Fe2O3reaches 273.1 mAh g−1, and its discharge specific capacity, cycle stability, and multiplicity performance are superior to those of commercial graphite. In comparison with anatase TiO2and hematite Fe2O3, TiO2@Fe2O3has higher conductivity and lithium-ion diffusion rate, thereby enhancing its rate performance. The electron density of states (DOS) of TiO2@Fe2O3shows its metallic nature by DFT calculations, revealing the essential reason for the high electronic conductivity of TiO2@Fe2O3. This study presents a novel strategy for identifying suitable anode materials for commercial lithium-ion batteries.Keywords:lithium-ion batteries;anode materials;TiO2@Fe2O3microspheres;electrochemical properties;first-principles calculations
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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）