CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yichao Gong,Zhong Chen,Mao Yang,Hailiang Wang,Chen Dang,Wanxia Huang,Tiecheng Lu
Li 4 SiO 4 has been widely studied as attractive tritium breeding materials due to its innate merits. Considering the potential advantages of nanostructure in tritium breeding materials, a distinctive process was developed to obtain nanostructured Li 4 SiO 4 pebbles. In brief, ultrafine precursor powders were synthesized by solvothermal method without using surfactants , and then indirect wet method was adopted to generate the green spheres with homogeneous microstructure. After that, the suitable sintering conditions were defined by studying the effects of sintering parameters on the grain size evolution, and nanostructured Ti-doped Li 4 SiO 4 pebbles were first obtained by two-step sintering method. This study will be expected to provide references for fabricating other Li-based tritium breeding materials.
研究领域:
核能科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Menghui Yan,Fang Jin,Yigang Ding,Guiying Wu,Rong Chen,Luhui Wang,Yuanzhi Yan
A novel titanosilicate zeolite was synthesized by a sequential treatment of ERB-1 with deboronation and atom-planting method to develop an epoxide catalyst. The Fourier transform infrared (FTIR) and the diffuse reflectance infrared Fourier transform (DRIFT) characteristic results reveal that the silanol hydroxyl nests generated by deboronation process are further consumed by the dehydrochlorination of TiCl4 during the atom-planting treatment. At the same time, the titanium species are incorporated into the framework of MWW structure. The energy-dispersive spectroscopy (EDS), ultraviolet-visible light (UV-vis), and ultraviolet resonance Raman spectroscopy (UVRRS) characterization results reveal that the amount and coordination states of the incorporated Ti species can be controlled by the atom-planting treatment time and temperature. The catalytic performance of the new titanosilicates in the epoxidation of 1-hexene with H2O2 and of cyclohexene with tert-butyl hydroperoxide is compared for the efficiency of Ti species in the hydrophilic and hydrophobic system. The catalytic results show the framework tetrahedral coordinated titanium species are more efficient for epoxidation than extra-framework octahedral Ti species.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 39
·16219-16226
·
IF 6.7
Senhao Wang,Yuan Wang,Tian C. Zhang,Xu Ji,Shaojun Yuan
The electrocatalytic nitrogen reduction reaction (eNRR) has been widely recognized as a promising method for green ammonia synthesis. However, the inert NN bond, inferior catalytic activity and small electrochemically active area impede its practical application. To circumvent these problems, we proposed self-supported Ti-doped iron phosphide (FeP) nanorod arrays grown on carbon cloth (Ti-FeP/CC) as an electrode for eNRR. The introduction of Ti doping sites regulated the electron structure of FeP, leading to electron migration from Fe to P, which facilitated N2-to-NH3 conversion. The as-prepared Ti-FeP/CC showed an enhancement of electrochemical surface area (ECSA), high electrical conductivity and well-exposed active sites. Ti-FeP/CC was capable of producing a high NH3 yield of 10.93 μg h−1 cm−2 and faradaic efficiency of 10.77% at an optimal voltage of −0.3 V (vs. RHE) in a 0.1 M Na2SO4 solution with excellent stability and durability during the eNRR process. This work not only presents a promising electrode material for eNRR, but also provides a new insight into rational heteroatom doping for electrocatalysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yi-heng Zhang,Lin Zhu,Xin Guo,Wen-jing Zhang,Xiang Shao,Ji Yang
The treatment of livestock wastewater is a major environmental challenge due to the presence of antibiotics from animal excreta, which may pass through conventional biological oxidation treatment and pose a threat to public health. Electro-oxidation method presents an opportunity to remove antibiotics in the livestock wastewater at the source of generation, and titanium-based IrO 2 anode has been shown to have excellent electro-catalytic activity and stability. However, the soaring price of iridium limits the practical application. In this work, we showed that W, Ti-doped IrO 2 anodes largely preserved the electro-catalytic activity while reducing the cost of electrode fabrication. The prepared Ti/Sb-SnO 2 /(Ir 0.6 W 0.2 Ti 0.2 )O x anode was shown to achieve 94 % conversion of sulfadiazine in 1 min and 100 % conversion in 15 min. Additionally, complete removal of chemical oxygen demand (COD 0 = 700–800 mg/L) was achieved in 1–3 h of electrolysis at 40 mA/cm 2 . Chlorine-mediated oxidation was demonstrated to be the main mechanism for organic contaminant degradation. The COD removal during galvanostatic electrolysis exhibited zero-order kinetics, indicating that the reaction rate was controlled by the heterogeneous reaction at the anode surface. In the stability test, >95 % COD removal was maintained after 5 cycles of electro-oxidation experiments. The accelerated life of the anode was tested to be 352 h (1000 mA/cm 2 , 1 M H 2 SO 4 electrolyte, 60 °C).
研究领域:
环境科学
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水处理工程
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wen-Jing Shi,Ding Zhang,Xiao-Meng Meng,Chen-Xun Bao,Shou-Dong Xu,Liang Chen,Xiao-Min Wang,Shi-Bin Liu,Yu-Cheng Wu
Sodium-ion batteries (SIBs) are recognized as attractive alternatives for grid-scale electrochemical energy storage applications. Transition metal oxide cathodes represent one of the most dynamic materials for industrialization among the various cathodes for SIBs. Here, a cation-doped cathode Na0.44Mn0.89Ti0.11O2 with a tunnel structure is introduced, which undergoes a lowered volume change of only 5.26% during the Na+ insertion/extraction process. Moreover, the average Na+ diffusion coefficients are enhanced by more than 3-fold upon the doping of the Ti cation. The obtained cathode delivers a practically usable capacity of 119 mAh g–1 at 0.1 C as well as an enhanced discharge capacity of 96 mAh g–1 at 5 C. Durability is demonstrated by the retained 71 mAh g–1 after 1000 cycles, corresponding to a capacity retention of 74%. This work demonstrates that the reticular Na0.44Mn0.89Ti0.11O2 is a promising ultrastable cathode material for the development of long-life sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 38
·期 2
·442-453
·
IF 3.309
Cui Yanhua,Yang Lili,Yan Yan,Wang Zengkai,Zheng Jian,Li Binrong,Feng Yonghai,Li Chunxiang,Meng Minjia
The photocatalytic efficiency of conventional blending photocatalytic membranes suffers a significant reduction due to effective photocatalyst embedded in membrane matrix. Therefore, in this study, inspired by the bioadhesive technology of polydopamine (pDA), a novel Ti doped bismuth oxyiodide (BiOI)-polydopamine (pDA)-coated cellulose acetate (CA) (Ti/BiOI-pDA/CA) photocatalytic nanocomposite membranes were successfully developed for effective removal of tetracycline (TC). The Ti/BiOI-pDA/CA nanocomposite membranes displayed very high photocatalytic activity toward TC (about 98% after 120 min) under visible light irradiation and superior photodegradation kinetics (k=0.03214 min −1 ). The removal rate of Ti/BiOI/-pDA/CA nanocomposite membranes under dynamic cyclic degradation system could be further improved, giving TC removal efficiency of 91% in 60min. Remarkably, the permeate flux, flux recovery ratio (FRR), reversible fouling (Rr), irreversible fouling (Rir) and the total fouling ratio (Rt) revealed the Ti/BiOI-pDA/CA nanocomposite membranes had excellent antifouling performance. In addition, the Ti/BiOI-pDA/CA nanocomposite membranes exhibited excellent stability and reusability. Therefore, this work gives insight into the effective removal of TC wastewater and has a great potential for new generation of high-performance photocatalytic membranes for practical wastewater treatment in the future.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·1989
·
IF 4.4
Kexin Zheng,Jiawei Wang,Haifeng Wang,Zhengqing Pei,Qian Wang,Xinjie Zhou,Dehua Ma,Ju Lu
The P2-Na0.7MnO2.05cathode material has long been constrained by phase transitions induced by the Jahn–Teller (J–T) effect during charge–discharge cycles, leading to suboptimal electrochemical performance. In this study, we employed a liquid phase co-precipitation method to incorporate Ti during the precursor Mn3O4synthesis, followed by calcination to obtain Na0.7TixMn(1−x)O2.05materials. We investigated the effects of Ti doping on the structure, morphology, Mn3+concentration, and Na+diffusion coefficients of Na0.7TixMn(1−x)O2.05. Our findings revealed that the 7% Ti-doped NTMO-007 sample exhibited reduced grain agglomeration and smaller particle sizes compared to the undoped sample, thereby enhancing the electrode–electrolyte contact area and electrochemical activity. Additionally, Ti doping increased the crystal cell volume of Na0.7MnO2.05and broadened the Na+transport channels, significantly enhancing the Na+diffusion coefficient. At a 0.5 C rate, the NTMO-007 sample demonstrated a specific capacity of 143.3 mAh g−1with an 81.8% capacity retention after 100 cycles, markedly outperforming the undoped NMO sample, which had a capacity retention of only 61.5%.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Longqing Chen,Bo Huang,Xiaoliang Yang,Youyun Lian,Xiang Liu,Jun Tang
Tungsten-potassium-titanium (W-K-Ti) alloys were fabricated by spark-plasma-sintering (SPS) and traditional rotary swaging (RS) techniques. Doping conditions and sintering methods were compared on the relative density, microstructure, hardness, recrystallization temperature, and the thermal shock resistance properties. Transient heat loads under 0.37 GW m −2 were applied on the W-K-Ti samples at room temperature for different cycles and pulsed durations. It was found that moderate Ti-doping (0.05 and 0.075 wt%) in W-K alloys can enhance the thermal shock resistance. Low-cycle thermal fatigue test suggested better thermal shock resistance in SPS-sintered W-K-Ti alloy (SPS-W-K-Ti) using TiH 2 dopant . The main reason was that the decomposition of TiH 2 significantly reduced the oxygen content of the ingots, which improved the ductility and thermal shock resistance of tungsten alloys . Further fracture analyses indicated that Ti-doping through TiH 2 formed intra- and inter- Ti-rich voids in TiH 2 -doped W-K alloy, while only intergranular Ti particles were found lying along grain boundaries in the Ti-doped one. The formation mechanism of the Ti-rich voids was investigated in detail. This work provides a potential route for obtaining plasma facing materials with high thermal shock resistance.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2012
·
IF 4.054
Ying Liu,Dong-Ping Wang,Yu-Xiang Yu,Wei-De Zhang
Functional carbon nanotubes (CNTs) were incorporated into Ti-doped Fe 2 O 3 thin films by a facile, one-step co-electrodeposition method. The films were characterized by X-ray diffraction, scanning electron microscopy, UV–visible absorption, and X-ray photoelectron spectroscopy. The introduction of CNTs results in a better absorption in visible region and greatly enhances the photoelectrochemical properties of the Ti–Fe 2 O 3 films. The improved photoelectrochemical properties of the CNTs and Ti co-doped Fe 2 O 3 films are due to the charge equilibration which interplays between the Ti–Fe 2 O 3 and CNTs. The effect of CNTs to mediate fast charge transfer and to retard charge recombination rate in the composites is also demonstrated by kinetics analysis and electrochemical impedance spectroscopy . The influence of different groups-modified CNTs and different content of CNTs was also studied. The highest photocurrent is 4.5 mA/cm 2 at 1.23 V (vs. RHE) obtained by incorporating 0.10 mg/mL amino-group modified CNTs in the Ti–Fe 2 O 3 film. The amino-functionalized CNTs doped film exhibits the highest photoelectric response compared with those doped by the pristine and acid-treated CNTs under the same conditions, which can be ascribed to the better hydrophilicity and dispersibility of the amino-functionalized CNTs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Qianyi Li,Shanshan Deng,Donglai Li,Junlin Yang,Haibo Jin,Jingbo Li
Cesium tungsten bronze (Cs x WO 3 ), a unique energy-saving material, has attracted great interest because of its excellent visible transmittance and near-infrared absorption. In order to improve its optical properties , the Ti doping modification was carried out in this work, and a series of Ti-doped Cs X WO 3 (Ti-Cs x WO 3 ) nanopowders were synthesized by a solvothermal reaction and post-annealing. The 1.71 at. % of Ti dopants achieved remarkable enhancement of both integral visible transmittance ( T lum , 380–780 nm) and near-infrared shielding efficiency ( Ψ NIR , 780–2500 nm) of Cs x WO 3 . The T lum and Ψ NIR of the 1.71 at. % Ti-Cs x WO 3 polymer film reaches 63.87 % and 76.90 %, respectively, higher by 51.88 % and 65.00 % than those of the Cs x WO 3 film. The improvement of T lum is attributed to the broadening of band gap and smaller size of the nanoparticles induced by Ti doping, and the enhanced Ψ NIR would result from the increased free electron concentration and energy levels of impurities. The incorporation of Ti elements renders Cs x WO 3 a promising application in the field of energy saving.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
能源效率
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 11
·e202200297
·
IF 9.14
Panfeng Wu,Tianyu Wang,Qi Xue,Mengkai Wang,Ruihua Zhong,Jun Hu,Zhong Chen,Danjun Wang,Ganglin Xue
Graphical Dual active sites : Ti is introduced into the δ-Bi 2 O 3 lattice (Ti−Bi 2 O 3 ) to tune its local electronic structure. The interaction of nitrogen and the bridging oxygen in Ti−Bi local lattice realizes the activation of nitrogen, and the Ti−Bi dual active sites reduce the hydrogenated energy barrier (*NN→*NNH) from 2.65 to 2.13 eV; thus, the ammonia production rate reaches 508.6 μmol g cat −1 h −1 without sacrificial agent. Under mild conditions, nitrogen undergoes the associative pathways to be reduced with solar energy as the driving force for fixation, avoiding the high energy consumption when undergoing dissociation. Nevertheless, this process is hindered by the high hydrogenation energy barrier. Herein, Ti was introduced as hard acid into the δ-Bi 2 O 3 (Ti−Bi 2 O 3 ) lattice to tune its local electronic structure and optimize its photo-electrochemistry performance (reduced bandgap, increased conduction band maximum, and extended carrier lifetime). Heterokaryotic Ti−Bi dual-active sites in Ti−Bi 2 O 3 created a novel adsorption geometry of O−N 2 interaction proved by density functional theory calculation and N 2 temperature-programmed desorption. The synergistic effect of dual-active sites reduced the energy barrier of hydrogenation from 2.65 (Bi 2 O 3 ) to 2.13 eV (Ti−Bi 2 O 3 ), thanks to the highly overlapping orbitals with N 2 . Results showed that 10 % Ti-doped Bi 2 O 3 exhibited an excellent ammonia production rate of 508.6 μmol g cat −1 h −1 in water and without sacrificial agent, which is 4.4 times higher than that of Bi 2 O 3 . In this work, bridging oxygen activation and synergistic hydrogenation for nitrogen with Ti−Bi dual active sites may unveil a corner of the hidden nitrogen reduction reaction mechanism and serves as a distinctive strategy for the design of nitrogen fixation photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Tingting Yang,Yalan Huang,Jian Zhang,He Zhu,Jincan Ren,Tianyi Li,Leighanne C. Gallington,Si Lan,Ligao Yang,Qi Liu
Iron- and manganese-based layered metal oxides, as cathodes for sodium ion batteries, have received widespread attention because of the low cost and high specific capacity. However, the Jahn-teller effect of Mn 3+ ions and the resulted unstable structure usually lead to continuously capacity decay. Herein, Titanium (Ti) has been successfully doped into Na 2/3 Fe 1/3 Mn 2/3 O 2 to suppress the Jahn-Teller distortion and improve both cycling and rate performance of sodium ion batteries. In situ high-energy synchrotron X-ray diffraction study shows that Ti-doped compound (Na 2/3 Fe 1/3 Mn 0.57 Ti 0.1 O 2 ) can maintain the single P2 phase without any phase transition during the whole charging/discharging process. Various electrochemical characterizations are also applied to explore the better kinetics of sodium ions transfer in the Na 2/3 Fe 1/3 Mn 0.57 Ti 0.1 O 2 . This work provides a comprehensive insight into the Ti-doping effects on the performance from both structural and electrokinetic perspectives.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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