ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Song,Hanqing Zhao,Jianqi Ye,Mengmeng Kang,Siyu Miao,Zhong Li
Ti–O–C channels for ultrafast sodium storage were constructed in N/S-co-doped TiO2–C nanofibers, which deliver a high rate performance of 181.9 mAh g–1 at 5 A g–1 after 3000 cycles. The existence of Ti–O–C bonds at the interface of TiO2–C phases was revealed by synchrotron radiation X-ray absorption spectra. Based on this, first-principles calculations further verified the low energy barrier for Na+ insertion/extraction in the Ti–O–C channels formed by the intimately integrated graphite layer with TiO2 near the surface. In addition, surface defects induced by heteroatoms accelerate the Na+ mass transfer through the pathway from the carbon surface to the Ti–O–C channel.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 1
·209-221
·
IF 2.372
Xu Songlin,Zhang Mingyi,Guo Shujuan,Li Mengru,Huang Qingming,Chen Xiaohui
Abstract Diffusion limitation caused by microporous molecular sieves has always been a bottleneck problem in liquid phase epoxidation. In this study, several different carbon sources were used as hard templates to prepare hierarchically porous zeolite Ti-MWW (cTi-MWW) successfully. Compared with conventional Ti-MWW, cTi-MWW has an additional hierarchically porous structure and abundant pore structure distribution. Especially, the cTi-MWW prepared with polyethylene glycol1540 (PEG) as the hard template not only has a multiple hierarchically porous structure, but also exhibits small crystal size and good hydrophobicity properties studied by TEM and in situ FT-IR. At the same time, the cTi-MWW prepared with PEG exhibits better activity than the conventional Ti-MWW in the selective epoxidation reaction of allyl alcohol (AAL) with H 2 O 2 as oxidant and the conversion is improved by 11% (Si/Ti = 20). And a higher efficiency and longer catalyst life in fixed-bed catalytic reactor were exhibited by using cTi-MWW PEG as catalyst. The physicochemical properties of cTi-MWW prepared with different hard templates were systematically studied by SEM, XPS, UV–Vis, XRD and N 2 absorption–desorption techniques. This method is effective for the synthesis of cTi-MWW and significant for the preparation of hierarchically porous zeolites in industrial production. Graphic Abstract A hierarchically porous zeolite Ti-MWW prepared with different hard templates successfully. With the hierarchically porous structure, which have better adsorption, diffusion, and reactivity in liquid phase epoxidation, thus improving the catalytic activity. Especially, the hierarchically porous zeolite Ti-MWW prepared with polyethylene glycol exhibits small crystal size and good hydrophobicity properties.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 2
·348-363
·
IF 2.936
Chu Jidong,Ge Zhijin,Peng Jiahui,Hu Hui,Guo Shujuan,Chen Xiaohui
The efficient and economic heteroatom-implanting method for MWW-type zeolite has been the focus of attention and needs further exploration. Ti incorporated MWW zeolite was synthesized by sequential treatment of boron-containing zeolite precursor. The catalysts were applied to the epoxidation of 1-hexene. The implanting titanium process was conducted under a mild condition with Ti(SO 4 ) 2 /NH 4 HF 2 /HNO 3 solution, and the product Ti-MWW precursors have framework titanium alone, the novel method is named as refluxing and implanting titanium method which integrates acid treatment and titanium incorporation into one step and reduces the consumption of time of this process into 1 h. A density functional theory was conducted to explain the formation mechanism of interlayer-expanded structure of Ti-MWW zeolite. Subsequently, Ti-MWW precursors were treated in modified reagent solution to obtain larger pore structure, which increase the conversion of 1-hexene from 20.45 to 62.96%. The catalytic performance of Ti-MWW zeolite in this work are superior to Ti-MWW zeolite synthesized by traditional dry-gel conversion method the conversion of 1-hexene of which was 4.2%. This novel method is a promising approach for the synthesis of high catalytic performance heteroatomic zeolite. Graphical abstract
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Wei Cai,Chunlin Fu,Rongli Gao,Weihai Jiang,Xiaoling Deng,Gang Chen
Ti-doped bismuth ferrite thin films were prepared via sol–gel spin-coating method. The effects of titanium on the microstructure, optical, leakage, ferroelectric and photovoltaic characteristics have been investigated systematically. The result shows that bismuth ferrite thin films doped with 0–8 at.% Ti are rhombohedral distortion perovskite structure. The addition of titanium inhibits the grain growth and enhances the thickness uniformity and can decrease the band gap of bismuth ferrite thin films. The leakage current of bismuth ferrite thin films is effectively reduced by adding a certain amount of titanium and the leakage mechanism has been investigated. Addition of titanium increases the remnant polarization of the films. As titanium content increases, the short circuit photocurrent density decrease first and then increase, while the open circuit photovoltage increase first and then decrease. The power conversion efficiency of Ti-doped bismuth ferrite thin films increases as titanium content increases, which can be explained as a result of the increased remnant polarization and decreased band gap.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 3
·384-396
·
IF 4.204
Liu Xiangyu,Pan Yanling,Zhang Peng,Wang Yilin,Xu Guohao,Su Zhaojie,Zhu Xuedong,Yang Fan
Alkylation of benzene to value-added, high octane number and low toxic toluene and xylenes provides a way to lower benzene content in gasoline pool, and is hence a method to promote fuel quality. On the other hand, CO 2 accumulation in the atmosphere causes global warming and requires effective route for its valorization. Utilization of CO 2 as a carbon source for benzene alkylation could achieve both goals. Herein, alkylation of benzene with CO 2 and H 2 was realized by a series of low-cost bifunctional catalysts containing zinc/titanium oxides (Zn/Ti oxides) and HZSM-5 molecular sieves in a fixed-bed reactor. By regulating and controlling oxygen vacancies of Zn/Ti oxides and the acidities of HZSM-5, benzene conversion and CO 2 conversion reached 28.7% and 29.9% respectively, along with a total selectivity of toluene and xylene higher than 90%. In this process, more than 25% CO 2 was effectively utilized and incorporated into the target products. Moreover, the mechanism of the reaction was analyzed and the course was simultaneously traced. CO 2 was transformed into methanol firstly, and then methanol reacted with benzene generating toluene and xylene. The innovation provides a new method for upgrading of fuels and upcycling the emissions of CO 2 , which is of great environmental and economic benefits.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xia Wu,Shi-Xi Zhao,Lei Wei,Hui Deng,Ce-Wen Nan
Li 2 MnSiO 4 cathode material suffers from structure collapse and thus rapid capacity fading during cycling. Here, we employed the stable [TiO 6 ] ligands as a local pillaring framework to improve the structural stability. Porous Li 2 MnSi 1- x Ti x O 4 /C nanoparticles were successfully synthesized by employing SBA-15 as Si source. Rietveld refinement revealed Ti substitution caused the phase composition transition (partial Pmnb to Pmn 2 1 phase), which contributed to higher charge/discharge capacity. XPS confirmed the positions of Ti 4+ and the formation of [TiO 6 ] octahedrons. 15 mol% Ti doped sample (S-LMST) showed a highest specific surface area of 114.25 m 2 g −1 and delivered a highest initial discharge capacity of 182.7 mAh g −1 under 1.5–4.8 V. Interestingly, S-LMST electrode presented excellent cycling stability, especially retaining ∼94% of initial discharge capacity after 8th cycles, while pristine Li 2 MnSiO 4 only retained ∼55%. Additionally, S-LMST electrode exhibited higher discharge capacity under lower cut-off voltage. The maximal initial discharge capacity can reach to 259.7 mAh g −1 in 1.5–4.6 V. The enhanced cycling stability can be mainly ascribed to the pillaring effect of [TiO 6 ] octahedrons and the decreased charge transfer resistance, as well as the improved Li + diffusion coefficient due to porous structure.
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高影响因子
COMPUTATIONAL MATERIALS SCIENCE
·
2025
·
IF 3.3
Peipei Liu,Chunchun Dong,Xiping Chen,Xuemin Liang
Superhard ceramics are suitable materials to improve the surface characteristics of titanium. In this study, TiB 2 nanopowder was coated on titanium substrate using electrophoretic deposition in NaF-AlF 3 -Al 2 O 3 molten salts. The effects of varying deposition voltages and deposition times on TiB 2 coatings were investigated. Additionally, the microstructure of the coating surface was observed by scanning electron microscopy. With an applied cell voltage of 1.2 V and a deposition time of 1.5 h, a dense, defect-free TiB 2 /TiB composite coating (including the outer TiB 2 layer and the inner TiB whiskers layer) approximately 74 μm thick was produced, exhibiting a strong metallurgical bond to the substrate. A densely packed TiB whisker layer forms at the TiB 2 /Ti interface. The work of adhesion, interfacial energy, and electronic structure of the α-Ti(0001)/TiB 2 (0001) interfaces have been calculated using first-principles methods. Simultaneously, the diffusion of B atoms at the TiB 2 /Ti interface was computed to explain the formation process of TiB whisker layers. The work of adhesion calculations indicated that the B-HCP-Ti interfacial model exhibited the highest interfacial bond strength. The electronic structure of the interfacial model was analyzed to show that the Ti-terminated interface model was primarily formed through metallic bonds, while the B-terminated interface model was primarily formed through covalent bonds. Compared to the Ti-terminated interface, the B-terminated interface facilitates the diffusion of boron from TiB 2 into the titanium substrate more effectively.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13705-13712
·
IF 0
Zewen Fu,Tengfei Jiang,Lijing Zhang,Bingkun Liu,Dejun Wang,Lingling Wang,Tengfeng Xie
In this paper, we present the fabrication of Ti-doped α-Fe2O3 and surface treatment with Al3+ for application as a photoanode in photoelectrochemical water splitting. The Ti-doped α-Fe2O3 with Al3+ treatment shows a 100 mV cathodic shift of the onset potential and a notable improvement of the photocurrent density. The samples were characterized by SEM, TEM, HRTEM, XRD, Raman, UV-vis and XPS to obtain the information after surface treatment. Based on electrochemistry and photoelectrochemistry techniques, it appears that surface treatment with Al3+ passivates the surface states and decreases the accumulation of charge at the surface of Ti–Fe2O3. The results show that Ti-doped Fe2O3 with Al3+ surface treatment can be used as an efficient photoanode for photoelectrochemical water splitting.
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DOI
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 16
·7810-7818
·
IF 3.3
Yanke Guo,Qiaoyun Qin,Jing Zhu,Baohe Wang
Propylene glycol methyl ether was directly synthesized from propylene and hydrogen peroxide under mild conditions via aluminum modified titanium silicalite-1 as a bifunctional catalyst. It has both active sites capable of epoxidation and active sites capable of ring opening reactions, thus realizing the one-pot preparation of propylene glycol methyl ether by propylene. The synergistic effect of Ti–Al on the catalytic performance and the distribution of propylene glycol methyl ether isomer were investigated in detail, and the synergistic catalysis between the two active sites was characterized. The gradual introduction of aluminum reduced the activation ability for hydrogen peroxide, but gradually increased the selectivity for propylene glycol methyl ether. Under the optimum conditions, the selectivity for propylene glycol methyl ether reached 91.53%. Combined with Density Functional Theory (DFT) calculations, the synergistic catalytic effect of doped Al and framework Ti in titanium silicalite-1 is discussed in detail from a microscopic perspective. Al increases the Lewis acid strength of Ti active sites and promotes the conversion of propylene to propylene oxide (PO), and simultaneously Ti increases the Brønsted acid strength of Al active sites and promotes the conversion of propylene oxide to propylene glycol ether.
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高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 9
·1356-1362
·
IF 1.889
Xu Jianxiong,Xie Shaowen,Feng Yahui,Du Jingjing,Xu Lijian
TiO2 nanoparticles with average diameter of 510 nm were prepared by sol–gel surfactants, and the hierarchically nanoporous Ti–SiO2 particles were further prepared using in-situ method. The hierarchically nanoporous Ti–SiO2 particles
with hollow structure were analyzed by transmission electron microscope (TEM), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), nitrogen adsorption stripping curves and Barrett-Joyner-Halenda (BJH) pore size distribution curves. Finally, the hierarchically nanoporous
Ni–Mo composite electrodes were prepared using the TiO2 nanoparticles or nanoporous Ti–SiO2 particles as composite particles respectively, and the influence of the concentration of composite particles on the electrocatalytic activities of Ni–Mo composite
electrodes for hydrogen evolution were investigated by polarization curves. The results showed that the diameter of Ti–SiO2 particles was from 200 nm to 500 nm, and specific surface area was 573 m2/g with pore volume of 1.19 cm3/g and mesopore size of
3.2 nm. The TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were fabricated by electrodeposition with TiO2 nanoparticles and nanoporous Ti–SiO2 particles as composite particles respectively. The electrocatalytic activities
of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen evolution were investigated. Results showed that the electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen
evolution reached the optimal value when the concentration of particles was 4 g/L and 2 g/L respectively. The electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were greater than that of Ni–Mo alloy electrode, and
the Ti–SiO2/Ni–Mo composite electrode showed the best electrocatalytic activity.
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Huang Jun,Yang Qirui,Hu Anyi,Liao Zhu,Zhang Zhengxi,Zheng Qinfeng,Ren Zhouhong,Zheng Shun,Zhang Yixiao,Yang Xiaolong,Xu Zhenming,Zhang Le,Zhu Daming,Wen Wen,Liu Xi,Orita Akihiro,Saito Nagahiro,Wang Liguang,Xia Yongyao,Chen Liwei,Lu Jun,Yang Li
Developing lithium-ion batteries with high specific energy and fast-charging capability requires overcoming the potential-capacity trade-off in negative electrodes. Conventional fast-charging materials (e.g., Li 4 Ti 5 O 12 , TiNb 2 O 7 ) operate at high potentials (>1.5 V vs. Li + /Li) to circumvent lithium plating, yet this compromises specific energy. A viable strategy for enhancing the specific energy is to reduce the potential while avoiding the lithium plating risk; however, the underlying mechanisms remain unclear. Here we demonstrate that enhancing Titanium-Oxygen covalency through pseudo-Jahn-Teller Effect distortion in Ruddlesden-Popper perovskites enables low-potential operation. The Li 2 La 2 Ti 3 O 10 negative electrode exhibits a working potential of 0.5 V vs. Li + /Li with initial 139.3 mAh g −1 at 5 A g −1 and 72.9% capacity retention after 5000 cycles. Full cells with LiNi 0.8 Co 0.1 Mn 0.1 O 2 positive electrodes deliver 3.45 V average discharge voltage-50% higher than conventional Li 4 Ti 5 O 12 | |LiNi 0.8 Co 0.1 Mn 0.1 O 2 systems-achieving 100 mAh g −1 at 4 A g −1 . Mechanistic analysis reveals low Li⁺ migration barriers and stable Ruddlesden-Popper perovskite frameworks enable rapid ion transport.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiahao Yang,Zhaoping Shi,Yibo Wang,Hongxiang Wu,Jing Ni,Pengbo Wang,Meiling Xiao,Changpeng Liu,Wei Xing
Despite proton exchange membrane water electrolysis (PEMWE) being a commercially viable method for high-purity hydrogen production, the development of active and robust anode electrocatalysts with reduced iridium loading under high current density conditions remains highly challenging. Here, we report a core-shell nanostructured catalyst with a metallic titanium core uniformly covered by Ir nanoparticles (Ti@Ir). The spontaneously formed TiO x layer can effectively disperse Ir nanoparticles via interfacial Ti-O-Ir bonds, which in turn increases the oxidation state of Ir towards activated lattice oxygen reactivity, as confirmed by in-situ differential electrochemical mass spectrometry (DEMS). As a result, the Ti@Ir exhibits an overpotential of only 272 mV to reach 10 mA cm −2 , 17 mV lower than non-supported Ir nanoparticles, and a 3.82-fold higher mass activity at 1.53 V. Moreover, the Ti@Ir catalyst demonstrates strong stability during a 100-hour test at 10 mA cm −2 . Detailed analysis reveals that the oxidation of iridium close to the titanium core is suppressed. The huge potential for practical application is further confirmed in a PEMWE prototype, with a low iridium loading of 0.5 mg Ir cm −2 , significantly lower than the typical 2 ∼ 4 mg Ir cm −2 required for traditional catalysts. This Ti@Ir catalyst achieves a cell voltage of 1.858 V at an industrial-level current density of 2 A cm −2 and maintains stable operation for 1800 h with an exceptionally low voltage degradation rate of only 1.252 μV h −1 .
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高影响因子
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