MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yue Wei,Gang Li,Jiaxu Liu,Yanhui Yi,Hongchen Guo
The sluggish interfacial mass transfer usually hinders the achievement of high-efficiency catalytic transformation of biomass, especially for solvent-free immiscible reagent systems. Herein, amphiphilic hybrid Ti-containing catalysts in situ incorporated with organic groups (Cn-Ti-HMS) were developed for boosting biphasic solvent-free epoxidation of methyl oleate (MO) with H 2 O 2 . Benefiting from the mutual effect between organic/inorganic precursors, the resulting low-defect catalysts exhibit well-mediated surface hydrophilic/hydrophobic balance and porosity by incorporating alkyl groups. Such mediation effect exhibits two superiorities: i) accelerated adsorption of reactants by amphiphilicity; ii) boosted substrate or product diffusion by porosity property. As such, remarkably promoted catalytic properties were achieved when compared with conventional Ti-HMS. Typically, methyl-functionalized C1–Ti-HMS-50 displays the optimal catalytic performance with a 95% conversion of MO. Further mechanism study recognizes the dominant role of surface wettability and Si–OH defects content in influencing MO conversion and epoxidized MO selectivity.
研究领域:
催化
·
材料科学
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化学工程
·
环境化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 16
·1-9
·
IF 2.8
Xie Yanjiang,Hao Hua,Cao Minghe,Yao Zhonghua,Liu Hanxing
In this study, we proposed a novel method of adding large amount of excessive Ti in Bi 0.5 Na 0.5 TiO 3 -based thin film to improve its energy storage density. Ti-excess 0.94Bi 0.5 Na 0.5 Ti x O 3 -0.06BaTi x O 3 (BNBT x , x = 1.00, 1.05, 1.10, 1.15) thin films were successfully prepared by sol–gel method. It was found that the phase structure of the thin films kept unchanged with the increase of Ti content, and substantial improvements in microstructure and breakdown strength could be obtained by the addition of an excess of Ti in BNBT x thin films, as well as reduced leakage. As a result, improved energy storage density of 34 J/cm 3 and energy storage efficiency of 48% were achieved simultaneously in BNBT 1.15 thin film at a medium electric field of 2400 kV/cm. Furthermore, Ti-excess thin films showed high-dielectric constant with good temperature stability from 25 to 200 °C. These results demonstrate that Ti-excess BNBT x thin film is a potential system for energy storage materials.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
Nanoscale
·
2026
·
IF 5.2
Haozhou Wang,Ming Zhao,Fu Zhao,Weixiang Shang,Hongxia Li,Ran Zhao,Peiliang Guo,Jinxiao Bao
This study successfully synthesized a series of 15Ce–xTi/CG catalysts with different TiO2 loading levels by integrating hydrothermal synthesis, impregnation techniques, and subsequent microwave sintering. To comprehensively evaluate the catalytic activity, microstructure, surface properties, and reaction mechanisms of the catalysts, a range of advanced techniques was employed, including NH3-SCR testing, XRD, XPS, SEM, BET, NH3-TPD, H2-TPR, and in situ DRIFTs. The experimental findings revealed that the incorporation of TiO2 significantly enhanced both the structural integrity and functional performance of the catalysts. Specifically, TiO2 facilitated stronger interactions between Ce and Ti, increased the Ce3+/(Ce3+ + Ce4+) ratio, enriched the surface acidic sites, and boosted the concentration of chemically adsorbed oxygen species. Among all the catalysts, 15Ce–6Ti/CG demonstrated superior NO conversion efficiency (exceeding 92% at 300 °C) and maintained high activity across an extensive temperature range of 250–400 °C, while exhibiting remarkable resistance to SO2 and H2O poisoning. In situ DRIFTs experiments further corroborated the coexistence of both Eley–Rideal and Langmuir–Hinshelwood mechanisms, indicating that the catalytic process can proceed via multiple pathways. These results highlight the synergistic effects between Ce and Ti species, as well as the structural advantages of coal gangue as a sustainable support material, providing critical insights for the development of high-performance, environmentally friendly NH3-SCR catalysts.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Xin Li,Zhongya Jia,Yi Wang,Kuo Liu,Xi Li,Tao Qi
The development of electrocatalysts that simultaneously exhibit high activity and robust stability for the oxygen evolution reaction (OER) is critical to advancing proton exchange membrane water electrolysis (PEMWE). In this work, Mn-doped RuO2 is composited with acid-resistant and highly conductive Ti4O7 via a simple molten salt method, yielding a Mn-RuO2/Ti4O7 hybrid electrocatalyst. Electrochemical measurements reveal that Mn-RuO2/Ti4O7 achieves a low overpotential of 194 mV at 10 mA cm⁻² and maintains stable operation for over 220 h at this current density. In situ spectroscopic analysis and computational studies further indicate that Mn doping modulates the electronic interplay between RuO2 and Ti4O7, which not only suppresses over-oxidation of Ru at high potentials but also promotes the deprotonation kinetics of reaction intermediates, thereby significantly enhancing the overall catalytic performance. This work offers an effective strategy for balancing activity and stability in acidic OER electrocatalys.
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产品关联
DOI
高影响因子
Materials Today Energy
·
2026
·
IF 8.1
Yifan Li,Hongshun Zheng,Tong Zhou,Hao Cui,Haigang Dong,Dongxia Yang,Ke Wang,Weijie Zhan,Boxue Wang,Yun Chen,Jize Li,Yuetong Cao,Zhikun Wang,Yumin Zhang,Jin Zhang,Qingju Liu
TiO 2 has emerged as one of the most extensively studied photocatalysts, because of its great stability and abundant availability. The hydrogen production efficiency of TiO 2 photocatalysts can be significantly enhanced derived from the precursors of titanium-based metal-organic frameworks (MOFs) loaded with single-atom. Although the hydrogen evolution activity of TiO 2 -based photocatalysts under ultraviolet light has been steadily enhanced in recent years, the activity under visible light remains a critical challenge to be addressed. Herein, we report a Zn single atom (Zn SA) loaded TiO 2 -based photocatalyst derived from Ti-BPDC (Ti-MOF). Under irradiation with visible light at 400 nm, the optimized sample exhibits a hydrogen evolution rate (HER) of 9.21 mmol g −1 h −1 with an apparent quantum efficiency (AQE) of 6.82%, with a HER approximately 3 times higher than that of pristine TiO 2 (3.14 mmol g −1 h −1 ), along with great stability. The results demonstrate that loading an appropriate amount of Zn SAs optimizes the band structure of the photocatalyst, activates the adjacent O atoms, and also suppresses the recombination of photogenerated electron-hole pairs, as well as modulates the adsorption-desorption equilibrium of H∗ species, thereby significantly enhancing photocatalytic activity. This work offers a strategy for designing TiO 2 -based photocatalysts with high visible-light activity.
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Cuiting Yang,Bowen Wu,Zewei Liu,Guang Miao,Qibin Xia,Zhong Li,Michael J. Janik,Guoqing Li,Jing Xiao
Ultra-deep desulfurization of transformer oil is of great demand among power industry. In this work, the effective and deep removal of various types of organosulfurs, including mercaptan, sulfide and disulfide via catalytic adsorptive desulfurization (CADS) using bifunctional Ti-based adsorbent is reported. Compared to adsorptive desulfurization (ADS), dramatically improvement of the organosulfur uptakes were achieved under CADS process. The equilibrium adsorption capacity at 5 μg∙g −1 S reached up to 15.7, 33.4, 11.6 and 11.9 mg∙g −1 for propyl mercaptan( n -PM), dimethyl sulfide(DMS), di- t -butyl disulfide (DTBDS) and dibenzyl disulfide (DBDS), which was 262, 477, 97 and 128 times to that of ADS process, respectively, and was the highest among the reported desulfurization adsorbents. Moreover, it achieved superior breakthrough capacity of 2050, 530 and 210 ml F·(g A) −1 at the breakthrough S concentration of 1 μg∙g −1 of the commercial transformer oil S containing 10, 50 and 150 μg∙g −1 , respectively. The effectiveness of CADS is associated to the transformation of sulfur species to higher polar sulfonic species with the assistance of mild oxidant, which can be readily captured by silanol groups on SiO 2 through H-bonding interaction. The excellent recyclability of the adsorbent can be realized through solvent washing or oxidative air treatment. This work provides an effective and economic approach for the elimination of trace amount of mercaptan, sulfide and disulfide from transformer oil.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jiamin Jiang,Meihua Zhu,Yongsheng Liu,Yuqin Li,Tian Gui,Na Hu,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Influences of synthesis conditions on the growth and catalytic performance of the Ti-MWW zeolite membrane are investigated in this work. Medium crystallization time, crystallization temperature , molar ratios of the precursor synthesis gels (TiO 2 /SiO 2 , H 2 O/SiO 2 and B 2 O 3 /SiO 2 ) are crucial to prepare the compact and good catalytic performance Ti-MWW zeolite membranes. High crystallization temperature and long crystallization time cause a hetero zeolite phase membrane on the mullite support. Excessive titanium in the precursor synthesis gel could easily arise TiO 2 particles and non-framework TiO 6 species on the membrane surface , which are greatly decreased the catalytic performance of the Ti-MWW zeolite membrane. Dilute precursor synthesis gel is not favor for preparing dense Ti-MWW zeolite layer. The as-synthesized Ti-MWW zeolite membrane is applied as catalytic membrane reactor for phenol hydroxylation by pervaporation in this study, the phenol conversion and benzenediol selectivity are 41.42% and 98.33%.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jing Chen,Tao Li,Haiyang Dai,Chao Wang,Zhiquan Chen,Jie Wu,Shizhuo Wang,Xuerui Cheng,Renzhong Xue
In this study, the impact of codoping Mg and Ti on the thermoelectric performance of AgSbTe2 materials was investigated. Through a two-step synthesis process involving slow cooling and spark plasma sintering, AgSb0.98–xMg0.02TixTe2 samples were prepared. The introduction of Mg and Ti dopants effectively suppressed the formation of the undesirable Ag2Te phase. Density functional theory (DFT) calculations confirmed that Ti doping facilitated the band convergence, leading to a reduction in the effective mass of the carriers. This optimization enhanced carrier mobility and, consequently, electrical conductivity. Additionally, the codoping strategy resulted in the reinforcement of point defects, which contributed to a decrease in lattice thermal conductivity. The AgSb0.98–xMg0.02TixTe2 sample achieved a maximum figure of merit (ZT) value of 1.45 at 523 K, representing an 87% improvement over the undoped AgSbTe2 sample. The average ZT value over the temperature range of 323–573 K was 1.09, marking a significant enhancement in thermoelectric performance. This research demonstrates the potential of Mg and Ti codoping as a strategy to improve the thermoelectric properties of AgSbTe2-based materials.
研究领域:
材料科学
·
热电学
·
固体物理
·
能源材料
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DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yaqing Zhang,Hongyan Xie,Huixin Jin,Xiaohui Li,Qiang Zhang,Yezhu Li,KaiFeng Li,Fenglan Luo,Wenlei Li,Chenzhe Li
In this study, LiMn2–xTixO4 cathode materials were synthesized by a simple one-step hydrothermal method, and the effects of Ti doping on the sample structure and electrochemical properties were examined. The results indicated that Ti doping did not affect the spinel structure of LiMn2O4, and no other hybrid phases were produced. Furthermore, appropriate doping with Ti improved the particle uniformity of the samples. The electrochemical performance results showed that LiMn1.97Ti0.03O4 exhibited much better cycling performance than the undoped sample. The discharge capacity of LiMn1.97Ti0.03O4 reached 136 mAh g–1 at 25 °C at 0.2C, and the specific capacity reached 106.2 mAh g–1 after 300 cycles, with a capacity retention rate of 78.09%. Additionally, the specific capacity of LiMn1.97Ti0.03O4 was 102.3 mAh g–1 after 100 cycles at 55 °C, with a capacity retention rate of 75.44%. The Ti-doped samples thus exhibited an impressive high-rate performance. The discharge capacity of LiMn2O4 was only 31.3 mAh g–1 at 10C, while the discharge-specific capacity of LiMn1.97Ti0.03O4 reached 73.4 mAh g–1. Furthermore, to assess the higher Li+ diffusion coefficient and lower internal resistance of the Ti-doped samples, cyclic voltammetry and impedance spectra data were obtained. Our results showed that Ti doping enhanced the crystal structure of LiMn2O4 and improved Li+ diffusion, resulting in significant improvements in the cycling and rate performance of Ti-doped samples.
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2019
·Vol. 50
·期 2
·940-949
·
IF 1.952
Ma Xue,Xie Hongwei,Qu Jiakang,Song Qiushi,Ning Zhiqiang,Zhao Haijia,Yin Huayi
Molten salts can provide a high-temperature and oxygen-water-free environment, and the electrochemical polarization is able to reduce the oxide scale on the surface of Ti and Ni particles in molten salts and, thereby, enhance the sintering and accelerating atom diffusion between Ti and Ni. Thus, an electro-assisted powder metallurgical (EPM) approach was developed to prepare porous Ti and NiTi from metal powders in molten salts, where the porous pellet cathode made of the mixture of Ni and Ti powders is electrochemically polarized to facilitate the generation of the porous Ti and NiTi at a temperature lower than 1000 °C. The electrolytic product obtained under a cell voltage of 3 V for 12 hours is nearly pure NiTi with a tiny amount of undesired Ni 3 Ti and NiTi 2 phases. Overall, the EPM route could be a straightforward and general way to prepare porous Ti and Ti-alloys for implants and other applications.
研究领域:
材料科学
·
冶金学
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电化学
·
生物医学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 12
·17518-17528
·
IF 5.532
Yu Zhao,Liaoyuan Chen,Jiayu Sun,Wenzheng Wu,Tianbiao Yu
Poor mechanical properties of Ni alloy hinder its widespread application in the industrial. In order to enhance its performance, Ni204-based composite coatings reinforced with in-situ TiC and (Ti, Nb)C particles were investigated and successfully built on 45 steel alloy via laser cladding technology. The strengthening phase characteristics, microstructure evolution, and mechanical properties of the samples were examined and analyzed. By doping Ti and C particles into the NbC–Ni composite coatings, the large lump structure of NbC was effectively eliminated. The alternative formation of TiC and NbC promoted the in-situ generation of the multiphase (Ti, Nb)C and further prevented the NbC from agglomerating. Therefore, the problem of TiC particles floating has been effectively alleviated. The microhardness is up to 1.53 higher than that of the original Ni204 coating. Compared with the mass fraction ratio of Ti/C/NbC is 7:2:21 composite coating, the wear resistance of the composite coating (the addition of NbC is 30%) is improved by around 11 times. The composite coating has excellent combination property when the mass fraction ratio of Ti/C/NbC is 4:1:5. This work provides insight into the Ni204-based composite coatings by ceramic reinforcement.
研究领域:
材料科学
·
表面工程
·
复合涂层
·
激光加工
·
耐磨性
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 1
·1-9
·
IF 2.8
Song Peiqi,Zhu Zhe,Yao Zhonghua,Hao Hua,Cao Minghe,Liu Hanxing
Piezoelectric materials are widely used in the direction of sensors. PZT-based ceramics are very suitable for precision sensors. However, due to the low Curie temperature, the application temperature range of the material is relatively narrow. Here we show a high-performance material 0.6PZT–0.4PNN. In this case, a morphotropic phase boundary (MPB) region was artificially designed in the 0.6Pb(Zr x Ti 1 −x )O 3 –0.4Pb(Ni 1/3 Nb 2/3 )O 3 ( x = 0.35–0.41) ceramics to develop high-performance piezoelectric compositions which could cofire with low-cost Ag/Pd inner electrode by 0.2wt% Li 2 CO 3 addition. The ceramic composition at x = 0.39 near MPB possess exceptional properties with high piezoelectric coefficient d 33 ∼ 611 pC/N, planar electromechanical coupling coefficient k p ∼ 53.5%, low mechanical quality factor Q m ∼ 64.5 piezoelectric strain of 0.17%, and suitable Curie temperature T c ∼ 191 °C, respectively. The fact that d 33 was detected close to T c , and no noticeable change below 6.6% in cycling stability was observed at 20 kV/cm means a robust temperature-independence and fatigue reliability of the piezoelectric ceramics. Thus, this research provides a novel high-piezoelectricity configuration with elemental regulation, comparable to the commercial PZTs.
研究领域:
材料科学
·
陶瓷
·
固体物理
·
传感器技术
·
电子陶瓷
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DOI
高影响因子
危险品化学品经营许可证（带存储）