MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2019
·
IF 4.081
Ni Xiong,Rui Bao,Jianhong Yi,Jingmei Tao,Yichun Liu,Dong Fang
Carbon Nanotubes (CNTs)/Cu-Ti composites with strong interfacial bonding were successfully prepared by Molecular Level Mixing (MLM) combined with Spark Plasma Sintering (SPS) method. The relationship between interface evolution and mechanical properties was carefully investigated by High Resolution Transmission Electron Microscopy (HRTEM). It was found that three typical transition interfaces (Ti 8 C 5 , Ti 8 C 5 +TiC, TiC) were formed between the CNTs and the Cu-Ti matrix when 0.3 wt% CNTs/Cu-Ti composite powder was sintered at 1073 K for 10min, 20min and 30min respectively. Strong interfacial bonding and well-preserved CNTs structure were simultaneously realized in the sample which was sintered at 1073 K for 10min. The interface evolution phenomenon of the Ti 8 C 5 to the TiC interface transition phase and a parallel orientation relationship ((219) Ti8C5 //(111) TiC ) were observed under a sintering time of 20 min at 1073 K. The 0.3 wt% CNTs/Cu-Ti composites sintered at 1073 K for 10 min exhibited yield strength of 368 MPa and tensile strength of 512 MPa, which were 59% and 51% higher than that of unreinforced Cu-Ti, 27% and 25% higher than that of 0.3 wt% CNTs/Cu composites without alloying. This study provides some new insights into the interfacial regulation of the CNTs/Cu composites with strong interfacial bonding and reinforcing effects.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Wanjun Zhao,Hui Ren,Yapeng Ou,Qingjie Jiao
The ignition temperature and combustion behavior are key parameters for the performance of energetic nanocomposites. This article aims to obtain nanocomposites with low ignition temperature and high reactivity by incorporating titanium nanoparticles (nTi) to aluminum nanoparticles (nAl)-based thermites. The ignition temperature, reactivity, and combustion efficiency of Al/xTi/oxidizer composites were investigated via temperature-jump (T-jump), combustion test, and calorimeter. The results reveal that the ignition temperature of Al/ x Ti/oxidizer composites shifted down ~90 °C, ~140 °C, and ~220 °C by adding 50 mol.% nTi (in the fuel) into nAl/KClO 4 , nAl/K 2 S 2 O 8 , and nAl/KIO 4 respectively. The reactivity of nAl/K 2 S 2 O 8 and nAl/KIO 4 also increased by 50% after adding 30% nTi. However, the combustion efficiency of nAl-based energetic composites reduced with the increasing contents of nTi. This study demonstrates that Al/ x Ti/K 2 S 2 O 8 and Al/ x Ti/KIO 4 nanocomposites with low ignition temperature, high reactivity, and moderate combustion efficiency are good candidates for energetic applications.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Pingping Gao,Zhiyong Xie,Xiaobo Wu,Chun Ouyang,Ting Lei,Piaopiao Yang,Chunbo Liu,Junbin Wang,Tao Ouyang,Qizhong Huang
A highly corrosion resistant and conductive carbon/PTFE/TiN composite coating on Ti bipolar plates is prepared by a two-step hydrothermal and impregnation process. The composite coating exhibits a full coverage with uniformly distributed PTFE and TiN particles when 0.1 mol/L of glucose is used as carbon source and 10 wt % PFTE + 3 g/L TiN suspension as impregnating solution. The as-prepared composite coating film shows 0.009 μA cm −2 of corrosion current density and 13 mΩ cm 2 of ICR in the simulated solution of proton exchange membrane fuel cells, respectively. Meanwhile, the potentiostatic polarization test shows that the corrosion current density of the composite coating is below 1 μA cm −2 under real PEMFC working conditions of the cathode (0.6 V) and anode (−0.1 V). Additionally, the composite coating enhances hydrophobic property with a static contact angle of 120.2°and 115.5°before and after polarization test, respectively. In summary, the Ti substrate with carbon/PTFE/TiN composite coating shows a great potential application as bipolar plates of PEMFCs.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Wenchao Ren,Zile Hua,Tongguang Ge,Xiaoxia Zhou,Lisong Chen,Yan Zhu,Jianlin Shi
Hierarchically structured Ti-β zeolites were prepared using a two-step post-synthesis approach. The physicochemical properties of the resultant Ti- m β-S x materials were determined using various techniques, including X-ray diffraction, scanning electron microscopy, inductively coupled plasma atomic emission spectroscopy, transmission electron microscopy, and ultraviolet-visible and ultraviolet-Raman spectroscopies. The porous structures of the synthesized hierarchical Ti-β zeolites were well preserved. Their catalytic performance was compared with that of pure microporous Ti-β materials using alkene epoxidation as a model reaction. It was found that although comparable catalytic activities were obtained for both types of catalyst in the epoxidation of small molecules, e.g., cyclohexene, the synthesized hierarchical Ti-β gave an enhanced catalytic performance in the epoxidation of bulky 1-dodecene.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Jian Mei,Wenjun Huang,Zan Qu,Xiaofang Hu,Naiqiang Yan
Ti-modified Co 3 O 4 catalysts with various Co/Ti ratios were synthesized using the co-precipitation method and were used in catalytic oxidation of dibromomethane (CH 2 Br 2 ), which was selected as the model molecule for brominated volatile organic compounds (BVOCs). Addition of Ti distorted the crystal structure and led to the formation of a Co-O-Ti solid solution. Co 4 Ti 1 (Co/Ti molar ratio was 4) achieved higher catalytic activity with a T 90 (the temperature needed for 90% conversion) of approximately 245 °C for CH 2 Br 2 oxidation and higher selectivity to CO 2 at a low temperature than the other investigated catalysts. In addition, Co 4 Ti 1 was stable for at least 30 h at 500 ppm CH 2 Br 2 , 0 or 2 vol% H 2 O, 0 or 500 ppm p-xylene (PX), and 10% O 2 at a gas hourly space velocity of 60,000 h −1 . The final products were CO x , Br 2 , and HBr, without the formation of other Br-containing organic byproducts. The high catalytic activity was attributed to the high Co 3+ /Co 2+ ratio and high surface acidity . Additionally, the synergistic effect of Co and Ti made it superior for CH 2 Br 2 oxidation. Furthermore, based on the analysis of products and in situ DRIFTs studies, a receivable reaction mechanism for CH 2 Br 2 oxidation over Ti-modified Co 3 O 4 catalysts was proposed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Ziqiang Zhang,Zhengfeng Shen,Chuanyu Zhu,Yunfang Wang,Yawen Wang,Caimei Fan,Rui Li,Jianxin Liu
Producing hydrogen from organic/inorganic hydrides is an innovative clean energy alternative to fossil fuels , addressing the increasing energy demands. Here, we first propose coupled photocatalytic water hydrogen production and N,N-dimethylformamide (DMF, C 3 H 7 NO) dehydrogenation technology to obtain high value-added H 2 and N,N-dimethylcarbamic acid (C 3 H 7 NO 2 ). ZnIn 2 S 4 @MIL-125(Ti) nanoheterostructures were synthesized using a simple solvothermal method and resulting in a photocatalytic H 2 production rate of 2.135 mmol h −1 g −1 (apparent quantum efficiency at 380 nm was 2.6 %) which is 2.77 times higher than pure ZnIn 2 S 4 . Liquid-phase mass spectrometry indicates that the DMF oxidation activity of ZIS@MIL heterojunction is double pure ZnIn 2 S 4 and only microcrystalline CO 2 is produced. Isotopes indicate that the production pathway of H 2 results from the coupling of the –CHO bond in DMF and the –H in water. The improved photocatalytic activity of the ZnIn 2 S 4 @MIL-125(Ti) heterostructure is attributed to facilitating efficient charge carrier transfer and separation and DMF depletion of holes accelerates electron transfer .
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yang Liu,Shaokai Ma,Shiqing Zhang,Fang Liu,Ying Wang,Xinyu Sun,Ying Li,Yanming Xue,Chengchun Tang,Jun Zhang
Efficient and sustainable hydrogen production via water electrolysis relies on the utilization of highly active electrocatalysts for the oxygen evolution reaction (OER). Birnessite (δ-MnO 2 ), a type of manganese oxide with a local atomic structure similar to the oxygen-evolving complex in photosystem II, has emerged as a highly promising OER catalyst. Despite considerable efforts have been dedicated to enhancing its activity, the crucial aspect of stability has been often overlooked. Herein, Ti ions have been selectively incorporated into the in-layered lattice of δ-MnO 2 nanosheet arrays using a hydrothermal method, aiming to enhance the stability without reducing its activity. The resulting optimal Ti-MnO 2 catalyst demonstrates enhanced OER activity in alkaline electrolyte, exhibiting an impressive 85 mV reduction in overpotential at 10 mA cm −2 , surpassing the initial MnO 2 (495 mV reduced to 410 mV). Remarkably, it shows exceptional durability, with negligible performance decrease observed over the entire 50-hour testing period. It has been demonstrated that the incorporation of Ti serves a dual purpose: it adjusts the electronic structure around Mn, enhancing activity, and simultaneously stabilizes the Mn 3+ active sites, resulting in exceptional durability. Furthermore, density functional theory (DFT) calculations provide additional confirmation of the optimized electronic structure of MnO 2 achieved through Ti doping, leading to a reduction in the free energy of adsorbed intermediates and expediting the kinetics of the OER process. Our findings open a pathway for enhancing OER stability and activity by doping electrocatalytic inert ions into the lattice of MnO 2 , applicable not only to Mn-based oxides but also other non-precious metal-based electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Jiaxing Li,Jiongming Chen,Ying Chen,Jialei Ren,Jianan Li,Liankui Wu,Hongwei Liu,Fahe Cao,Qingqing Sun
This study develops a new shot peening method, i.e., copper powder ultrasonic shot peening, and investigates its antibiofouling effect on commercially pure titanium grade 2 (TA2) alloy in seawater. The results indicate that adding Cu powder during ultrasonic shot peening can form a Cu-containing layer with a thickness 1–2 μm on the surface of TA2 alloy, primarily in the form of nanocrystals. This Cu-containing layer exhibits a 90 % antifouling efficiency against Pseudomonas aeruginosa and an 85 % efficiency against Aspergillus terreus , mainly due to the release of Cu ions during immersion. Electrochemical corrosion test results show that corrosion rate of this anti-fouling layer is two orders of magnitude higher than the substrate alloy, which significantly enhances the release of Cu ions and thereby improving the antifouling capability. Tensile test results show that Cu powder peening similarly improves the mechanical properties of TA2 alloy as conventional peening.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Congcong Wang,Jingjing Zhang,Qian Fu,Chenxi Niu,Yvtao Xu,Youhui Chen,Zaowen Zhao,Lingbin Lu
Due to marvelous sensitivity and flexibility, conductive hydrogels are popularly used as strain sensors in intelligent skin and wearable electronic devices fields. However, hydrogel tends to be destroyed after long-term use or in accident, leading to performance degradation. Herein, we developed an environmental-friendly Ti-containing conductive hydrogel. The hydrogel network was constructed via a simple two-step method with coordination reaction and amidation reaction based on a metal ion precursor from transitional coordination. The synergies of reversible metal coordination bonds and dynamic hydrogen bonds endowed the hydrogel with excellent self-healing properties (3 h, 93.66 %), tensile properties (136.46 kPa), compression properties (1.122 MPa), and anti-fatigue performance. At the same time, the hydrogel showed excellent self-adhesion, even underwater. Due to Ti 4+ , electrical conductivity of the hydrogel was visibly enhanced (σ = 25.64 mS·cm −1 ), which resulted in fast response (TS [time sensitivity] = 24.78 s −1 ) and short recovery time (153 ms). As a flexible strain sensor, the hydrogel with stable conductivity and high sensitivity could precisely detect and distinguish a series of human motions, even different letter pronunciations. These remarkable features make it a promising application in the fields of intelligent skin and wearable electronic devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Junli Xu,Zhengxi Li,Ran Wang,Xueqi Zhang,Xueping Zhang,Yingcong Wei,Xiaochuan Hou,Yunjian Liu
Effective combination of the photosensitive and photoactive units in metal–organic frameworks (MOFs) is vital to achieving efficient solar energy utilization for superior photocatalytic efficiency. In this study, we successfully organize photosensitive metalloporphyrin ligands and photoactive building units (Ti-oxo clusters) uniformly at a molecular level within a heterobimetallic metal–organic framework (MOF) nanostructure, denoted as TMF(X), where X represents Zn, Co, or Cu. The well-accessible Ti sites possess a close proximity to the metalized porphyrin, which is favorable for the electron-transfer kinetics to the photocatalytic center for the redox reaction. Furthermore, the metal ions at the porphyrin center are able to induce electron redistribution, more negative conduction band potential, and enhanced light absorption, which boosts the photocatalytic H2 evolution performance. Notably, the resulting heterobimetallic MOF nanostructures exhibited remarkably enhanced photocatalytic H2 evolution performance, especially for the nano TMF(Zn) with a maximum H2 evolution rate of 3.24 mmol g–1 h–1 under visible light irradiation, which is much higher than that of TMF (1.40 mmol g–1 h–1). Our work opens up a way for highly efficient MOF-based photocatalysts for H2 evolution and beyond.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaohui Sun,Dong Wang,Wei Wu,Xueying Zhao,Xuyang Zhang,Bo Wang,Xianhui Rong,Guohua Wu,Xiangwei Wang
The dual-band electrochromic smart windows (DESW) can selectively modulate visible (VIS) and near-infrared (NIR) transmittance, which is expected to effectively reduce building energy consumption. However, the complex preparation of dual-band electrochromic materials has restricted the further development of DESW. In this work, amorphous and crystalline Ti-doped WO3·2H2O (TiWH) were synthesized by a simple precipitation method, which does not require strict control of the oxygen content and temperature. Ti doping reduced the crystallinity of WO3·2H2O and increased the specific surface area. 3% TiWH films exhibited excellent dual-band electrochromism with high transmittance modulation (633 nm: 83.8%, 1050 nm: 72.5%), fast response time (bleached/colored time: 14.9/15.3 s at 633 nm, 16.0/3.5 s at 1050 nm), good coloration efficiency (633 nm: 22.8 cm2 C–1, 1050 nm: 90.8 cm2 C–1), and high capacitance of 47.1 mF cm–2 at 0.1 mA cm–2. The electrochromic device can still maintain good dual-band electrochromism (bright, cool, and dark modes). The excellent dual-band electrochromism and energy storage make TiWH have a good application prospect in green buildings.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Ziqi Zhong,Borui Du,Guowu Zhan,Jingran Xiao
Herein, the 3D printing technology is harnessed as a new and flexible strategy to fabricate a structural-parameter adjustable 3D-structured Ti-Fe 2 O 3 photoanode. The Ti alloy was discovered to be practicable during the synthesis of Ti-Fe 2 O 3 and enlisted as a substrate material for crafting a conical-array patterned Ti-Fe 2 O 3 photoanode. The conical array fashions an angle between the incident light (longitudinal side) and the photogenerated charge transport (transverse side), along with a considerably augmented light-receiving area. Significantly, the charge separation efficiency progressively escalates as the cone height augments. This undertaking accentuates the importance of modulating the parameter of a 3D-structured Fe 2 O 3 photoanode.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）