IONICS
·
2025
·
IF 2.6
Zhou Yongkang,Su Zihao,Miao Jie,Peng Gongchang,Wang Hao
O3-type NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) is recognized as a highly promising cathode material for sodium-ion batteries owing to its cost-effectiveness, substantial theoretical capacity, and facile synthesis. Nevertheless, this material suffers from rapid capacity decay caused by structural degradation and irreversible phase transitions at high voltages (> 4.0 V vs. Na + /Na). Herein, partial substitution of Fe 3+ sites with Ti 4+ in the transition metal layer was implemented. Systematic investigations via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) reveal that Ti substitution effectively stabilizes the layered framework by suppressing detrimental phase transitions through enhanced structural pillar effects. The optimized NaNi 1/3 Fe 0.23 Mn 1/3 Ti 0.1 O 2 delivers a specific capacity of 144.1 mAh g −1 within 2.0–4.2 V at 0.1 C, demonstrating 71.3% capacity retention after 100 cycles at 1 C (130 mA g −1 ). This work establishes a viable strategy for enhancing structural stability in O3-type cathodes through selective cation substitution. Graphical
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Fang Liu,Jiali Wang,Wei Chen,Xiaoying Zhang,Shengting Li,Jinping Li,Yu-Fei Song,Jinfeng Chu,Guang Liu
Magnesium hydride (MgH 2 ) is broadly deemed as one of the most prospective solid-state hydrogen storage materials. However, its large-scale application is hindered by several drawbacks, including an excessive dehydrogenation temperature (>300 °C), sluggish kinetic behavior, and inevitable agglomeration and growth during cycling. To address these challenges, two-dimensional few-layered laminated titanium carbide catalyst (FL-Ti 3 C 2 T x ) was synthesized via LiF/HCl etching followed by liquid-phase ultrasonic exfoliation. These FL-Ti 3 C 2 T x nanosheets exhibit efficient catalytic activity for MgH 2 hydrogen storage. The incorporation of 5 wt% FL-Ti 3 C 2 T x significantly reduces the initial dehydrogenation temperature of MgH 2 from 325 °C to 199 °C, while enabling the dehydrogenated sample to reabsorb hydrogen at room temperature. The MgH 2 + 5 wt% FL-Ti 3 C 2 T x composite demonstrates remarkable kinetic performance, releasing 6.5 wt% H 2 within 8 min at 300 °C and uptaking 5.49 wt% H 2 within 1 min at 100 °C. Even after 50 cycles of consecutive dehydrogenation and rehydrogenation, the composite retained a hydrogen storage capacity of 6.90 wt%, corresponding to a 95.30 % capacity retention rate. Microstructure analysis and theoretical calculations reveal that the unique lamellar morphology of FL-Ti 3 C 2 T x not only provides abundant active sites and hydrogen diffusion paths, but also effectively suppresses the agglomeration and growth of Mg/MgH 2 matrix during the hydrogen absorption and desorption. More importantly, the in-situ formed Ti/TiH 2 functions as a “hydrogen pump” accelerating hydrogen diffusion, prolonging the Mg H bond length, and weakening the interaction between Mg and H. These factors synergistically enhance the absorption/desorption kinetics of MgH 2 .
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PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 26
·21156
·
IF 4.6
Shaojie Hong,Fanhua Yu,Bin Guo,Xiangqian Ren,Xingfu Zhou
In recent years, “green synthesis” technology has emerged at the research forefront of the chemical industry as an environmentally friendly approach. As a new and effective chemical synthesis method, organic electrochemical synthesis technology has attracted increasing attention. In this paper, the sol–gel method is used to fabricate a Y-doped Ti/TiO 2 electrode. By adding different concentrations of Y ions, the macropore morphology of the film becomes more obvious, and substrate cracks are improved to a certain extent. EIS tests show that a 0.006-Y electrode exhibits lower charge-transfer resistance. Furthermore, linear voltammetry (LSV) analysis showed that the hydrogen evolution potential of the Y-doped Ti/TiO 2 film electrode was improved. At the optimal Y/Ti molar ratio of 0.006, hydrogen evolution potential reached −1.22 V, showing a −0.19 V shift compared with the undoped electrode, and the hydrogen evolution side reaction was effectively inhibited. Cyclic voltammetry (CV) tests show that the reduction peak current density in maleic acid solution is as high as 210 mA cm −2 , which is 1.7 times that of the undoped electrode, indicating that the addition of Y at trace concentrations improves the electrocatalytic reduction performance of the electrode. Considering that the cathode can reduce maleic acid at lower potential and has higher catalytic activity, cathode potential is controlled within the range of −0.6–1.2 V for the electrosynthesis of succinic acid. When the optimized reaction temperature is 50 °C, the electrosynthesis yield for succinic acid reaches 91%, and the current efficiency reaches 96.3%. Y-doped Ti/TiO 2 electrodes were prepared for succinic acid electrosynthesis. Y doping enhanced electrocatalytic reduction, achieving 91% yield and 96.3% current efficiency at 50 °C.
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ENERGY & FUELS
·
2025
·
IF 5.3
Mingqiang Chen,Yupei Li,Yishuang Wang,Defang Liang,Chang Li,Haosheng Xin,Jun Wang
Catalytic depolymerization of lignin (CDL) is a prospective technology for the efficient utilization of biomass. In this paper, novel B–Ti-modified diatomite-supported nickel phosphide catalysts (xNiP/BTD) were prepared to depolymerize lignin in a unique formic acid-assisted aqueous-phase glycerol medium. Under optimal conditions, 4NiP/BTD exhibited 100% lignin conversion and 95.4% lignin oil (LO) yield, in which the yield of petroleum ether (PE)-soluble product reached 20.6%. Based on the characterization results, the superior performance of 4NiP/BTD for CDL was attributed to the collaborative effect of metallic Ni0 centers and acidic sites within Ni3P species. Among these, metallic Ni0 sites activated formic acid and aqueous-phase glycerol to generate active hydrogen (denoted as H*); subsequently, lignin was dominantly converted into phenol and alkyl guaiacol under the comprehensive function of H*, Lewis (Niδ+ species), and Bronsted acid sites (P–OH groups). Additionally, a potential reaction pathway for CDL with 4NiP/BTD as the catalyst was suggested. This study established a feasible approach for the efficient conversion of lignin using crude glycerol and green clay resources.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yipeng Yan,Cheng Liu,Chuan Shan,Jingsong Xu,Kaiyue Tang,Tao Liu,Xin Chen,Tao Duan
Membrane separation is an efficient purification way to treat large quantities of oily wastewater. The core challenge of membrane separation technology in practical applications is to address membrane fouling and establish sustainable separation capabilities. A super-hydrophilic and self-cleaning nanofibrous membrane is designed and prepared in a large-scale, cost-effective and environmentally friendly process for oily wastewater efficient purification. The polyacrylonitrile/chitosan (PAN/CS) matrix membrane material prepared by co-electrospinning method has excellent self-cleaning ability after amorphous titanium dioxide coating (PAN/CS/Ti). The PAN/CS/Ti membrane not only shows super hydrophilicity (WCA ∼ 0°) and underwater super oleophobicity (UWOCA ∼ 153°) but also exhibits excellent chemical stability even in harsh environments without sacrificing separation performance. Due to the uniform modified micro-nanoporous structure, PAN/CS/Ti membrane has significant gravity-driven separation flux with high efficiency and excellent reusability for surfactant-free and surfactant stabilized oil-water emulsion. In addition, PAN/CS/Ti membrane also shows outstanding separation performance with flux > 2200 L·m −2 ·h −1 for high concentration oil-water emulsions (oil content above 20 %). Overall, this study prepared the super-hydrophilic and self-cleaning PAN/CS/Ti nanofibrous membrane by a simple and scalable approach with outstanding separation performances, which can be widely used in various emulsion separation, and practically as the effective solution for oily wastewater treatment.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Jiale Dou,Zhuwei Yang,Linsen Li,Xinyi Hu,Li Lin,Lixia Ling,Zhao Jiang
With the global energy structure transitioning towards decarbonization, hydrogen energy has emerged as a critical energy carrier due to its merits of zero carbon emissions and high energy density. As a candidate material for liquid organic hydrogen carrier (LOHC), it is necessary to develop efficient dehydrogenation catalysts of dodecahydro-N-ethylcarbazole (12H-NECZ) to overcome the challenges of low kinetics and selectivity. In this work, by the defect engineering strategy, a series of Pt-TiO 2 catalysts are synthesized via thermal reduction using titanium (Ti) as a reducing agent. The effects of various TiO 2 :Ti molar ratios (5:1 to 8:1), annealing temperatures (550–850 °C), and Pt loadings on the structural and catalytic properties are systematically investigated. It is indicated that the 2.5Pt-7:1–650 catalyst exhibits optimal dehydrogenation efficiency, achieving 100 % conversion, 99.03 % selectivity of NECZ, and hydrogen release capacity of 5.77 wt% under 453 K and 101.325 kPa for 7 h. Various structural characterizations from XRD, H 2 -TPR, ESR, and XPS analysis reveal that the oxygen vacancies and Ti 3+ species are generated induced by the metallic Ti reduction. The interaction between Pt and TiO 2 facilitates the electron transfer from TiO 2 to Pt, optimizes the electronic state of Pt and promotes the C-H bond cleavage of benzene ring in adsorbed 12-NECZ molecules. Furthermore, the kinetic analysis for a three-step reaction pathway confirms the dehydrogenation of 4H-NECZ to NECZ is the rate-limiting step. The stability measurements suggest that 2.5Pt-7:1–650 maintains the hydrogen release amount of 5.64 wt% after 20 cycles at 453 K, demonstrating the potential applications for the NECZ/12-NECZ system. This study provides a novel strategy for designing high-performance LOHC dehydrogenation catalysts through defect engineering.
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Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 41
·8535-8548
·
IF 7.571
Jiaxin Wu,Shaokang Jiang,Wenjia Xie,Yiyuan Xue,Mingxin Qiao,Xiangjun Yang,Xin Zhang,Qianbing Wan,Jian Wang,Junyu Chen,Xibo Pei
Biocompatibility and osteointegration of implants are highly desired in orthopedic and dentistry applications. The synthesis of a coating with ideal biocompatibility and osteogenic effect carries practical significance for improving the bio-inertness of pure Ti implants. Metal–organic frameworks (MOFs) are effective surface modification agents in bone regeneration applications. Bio-MOF-1, a classic type of biofriendly MOF with a bio-derived constitution, possesses biocompatibility and osteogenic potential resulting from its Zn core and adenine ligand. In this study, bio-MOF-1 coatings at multiple concentrations were synthesized on alkali-heat treated Ti, and their cytocompatibility and osteogenic properties were systematically examined both in vitro and in vivo. Coatings were characterized to confirm the successful synthesis of bio-MOF-1 coatings. These coatings exhibited advanced thermostability, excellent biocompatibility, and stable Zn2+ release, which up-regulated the expression of osteogenesis-related genes and proteins. Furthermore, bio-MOF-1 coating of Ti implants enhanced early osseointegration at the bone–implant interface. This study demonstrates the promising potential of bio-MOF-1 coatings with the osteogenic effect for surface modification in bone tissue engineering.
研究领域:
生物材料
·
组织工程
·
骨科
·
牙科学
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高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6666
·
IF 3.623
Xingru Zhang,Yinan Xiao,Beining Du,Yueming Li,Yuandong Wu,Liyuan Sheng,Wenchang Tan
The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3(BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi0.5Na0.5)TiO3-0.07Ba(Ti0.945Zr0.055)O3ceramics (BNT-BZT-xLa) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperatureTF-Rand depolarization temperatureTdshift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm2∙°C) atTd. For refrigeration, the indirect measurement demonstrates the ΔTmaximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer”P-Eloops, both calculated recoverable energy storage densityWrecand storage efficiencyηincrease to 0.23 J/cm3and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors.Keywords:BNT-based lead-free ceramics;electric properties;ferroelectric to ergodic relaxor state transition;La doping
研究领域:
材料科学
·
电子工程
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 34
·期 12
·3132-3141
·
IF 2.007
Zhang Wei,Li Xin,Wang Hong,Song Yongji,Zhang Shenghong,Li Cuiqing
Deep desulfurization of model oil by photocatalytic air oxidation and adsorption using Ti (1− x ) M
x
O 2 (M=Zr, Ce) was investigated. Ti (1− x ) M
x
O 2 (M=Zr, Ce) was prepared by urea gelation/co-precipitation method, and characterized by N 2 adsorption, XRD and UV-vis spectra. UV irradiation greatly enhanced the adsorptive capacity and selectivity of TiO 2 -ZrO 2 for organosulfur in model oil because organosulfur compounds were first photocatalytically oxidized to sulfoxides and sulfones over TiO 2 -ZrO 2 , which were then selectively adsorbed on the bifunctional material due to much higher polarities of generated sulfoxides and sulfones. The Ti/Zr molar ratio and calcination temperature were optimized to 5 : 5 and 500 °C with the sulfur removal of 99.6% after reaction for 2 h under UV irradiation. After adding 25 wt% toluene into model oil, the sulfur removal could still reach 97.2% after reaction for 7 h. TiO 2 -ZrO 2 could be well regenrated by washing with acetonitrile followed by thermal treatment in air.
研究领域:
化学工程
·
环境科学
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Meng Liu,Song Shi,Li Zhao,Min Wang,Guozhi Zhu,Jin Gao,Jie Xu
With the aim of utilizing O2 as an oxidant, cascade reaction strategy was usually employed by first transforming O2 into the in situ generated hydroperoxide and then oxidized the substrate. To combine the two steps more efficiently to get a higher reaction rate, a series of core–shell catalysts with core and shell having different wettabilities were designed. The catalysts were characterized by transmission electron microscopy, UV–vis spectroscopy, Fourier transform infrared, sessile water contact angle, among other methods. These catalysts were applied in the research of the diphenyl sulfide oxidation by the in situ generated hydroperoxide derived from ethylbenzene oxidation. Through control experiments, the hydrophobic modification in the shell and core will influence different steps of the overall cascade reaction. Further insight into the reaction illustrated that the overall reaction rate was not simply an adduct of the promotion effects from the two steps, which was mainly attributed to the inhibition effect for the co-oxidation of ethylbenzene with diphenyl sulfide. Through the guidance of the relationship, a rationally designed core–shell catalyst with appropriate modifying organic groups showed an enhanced performance of the overall cascade reaction. The rational design of the catalysts would provide a reference for other cascade reactions.
研究领域:
化学工程
·
催化科学
·
材料科学
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Mingyi Zhang,Zenan Lin,Qingming Huang,Yadong Zhu,Hui Hu,Xiaohui Chen
In this research, a novel green mechanochemical dry gel conversion method (MDGC) is reported to obtain submicron-sized Ti-rich MWW zeolite. First, titanium and silica sources were milled under milder conditions in a planetary ball mill to construct the uniform SiO 2 -TiO 2 composite powders with higher Ti contents. Subsequently, submicron-sized Ti-rich MWW zeolite powder was prepared via dry gel conversion (DGC) route using the obtained composite under mixed steam environment consisting of water and piperidine. The physicochemical properties of the SiO 2 -TiO 2 composites before and after calcination and corresponding Ti-MWW-MDGC were investigated by XRD, UV–Vis, FT-IR, SEM, XRF, and N 2 absorption-desorption. Moreover, Ti-MWW (30)-MDGC exhibited a superior catalytic activity during epoxidation with H 2 O 2 compared with the traditional DGC method, and the conversion of 1-hexene increased from 4.2% to 26.3%. The MDGC method is a promising approach for the green production of various zeolites with higher heteroatom contents, such as TS-1, Ti-Beta and Sn-MWW, etc.
研究领域:
材料科学
·
无机化学
·
催化化学
·
纳米材料
·
绿色化学
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高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 19
·3486-3494
·
IF 7.411
Qijing Bu,Shuo Li,Qiannan Wu,Lingling Bi,Yanhong Lin,Dejun Wang,Xiaoxin Zou,Tengfeng Xie
Semiconductor electrodes integrated with cocatalysts are key components of photoelectrochemistry (PEC)-based solar-energy conversion. However, efforts to optimize the PEC device have been limited by an inadequate understanding of the interface interactions between the semiconductor–cocatalyst (sem|cat) and cocatalyst–electrolyte (cat|ele) interface. In our work, we used ferrihydrite (Fh)-modified Ti–Fe 2 O 3 as a model to explore the transfer process of photogenerated charge carriers between the Ti–Fe 2 O 3 –Fh (Ti–Fe 2 O 3 |Fh) interface and Fh-electrolyte (Fh|ele) interface. The results demonstrate that the biphasic structure (Fh/Ti–Fe 2 O 3 ) possesses the advantage that the minority hole transfer from Ti–Fe 2 O 3 to Fh is driven by the interfacial electric field at the Ti–Fe 2 O 3 |Fh interface; meanwhile, the holes reached at the surface of Fh can rapidly inject into the electrolyte across the Fh|ele interface. As a benefit from the improved charge transfer at the Ti–Fe 2 O 3 |Fh and Fh|ele interface, the photocurrent density obtained by Fh/Ti–Fe 2 O 3 can reach 2.32 mA cm −2 at 1.23 V versus RHE, which is three times higher than that of Ti–Fe 2 O 3 . Graphical Water splitting : The excellent performance of ferrihydrite (Fh)/Ti–Fe 2 O 3 is attributed to the unhindered charge transfer at the Ti–Fe 2 O 3 |Fh and Fh|electrolyte interfaces. As a benefit from this improved charge transfer, the photocurrent density obtained by Fh/Ti–Fe 2 O 3 can reach 2.32 mA cm −2 at 1.23 V versus the reversible hydrogen electrode, which is three times higher than that of Ti–Fe 2 O 3 .
研究领域:
材料科学
·
光电化学
·
可再生能源
·
催化
·
半导体物理
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