CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Yu,Rongrong Chen,Xiang Ji,Zhijun Fu,Subing Jiang,Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO 3 (BFO)-modified (Ba 0.95 Ca 0.05 ) (Ti 0.89 Sn 0.11 )O 3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO- x BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO- x BFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO- x BFO showed Debye-type dielectric relaxation for x = 0.9%.
研究领域:
材料科学
·
物理学
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ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 31
·13859-13872
·
IF 7.6
Cao Yuanpeng,He Jingjing,Huang Liangchao,Tu Wenhui,Li Liqi,Huang Chenyi,Zhang Xinyu,Li Runlin,Zhang Yingjie,Dong Peng,Duan Jianguo
High-voltage lithium cobalt oxide (LiCoO 2 , LCO) offers high energy density for advanced electronics, but elevated cut-off voltages accelerate surface Co/O loss and structural degradation. Here, we report a scalable waste-to-value upcycling route that combines process-intensified regeneration with interfacial engineering to convert end-of-life LCO into a high-voltage-stable cathode. Mechanochemical leaching and continuous NH 4 HCO 3 -assisted co-precipitation produce a spherical Al-doped, Li-deficient precursor, which is regenerated by relithiation and calcination. Surface hydrolysis of tetrabutyl titanate followed by mild lithium-assisted annealing forms a conformal Li-Ti-O shell and a shallow Ti-enriched near-surface gradient. Multiscale characterization verifies the nanoscale coating and interfacial transition region, and first-principles calculations show that Ti lowers the surface energy of the LCO (104) facet, explaining the improved near-surface stability. The optimized material delivers 228.8 mAh g –1 at 0.2 C, 183.7 mAh g –1 at 5 C, and 85% capacity retention after 100 cycles at 1 C (3.0–4.6 V). This regeneration-to-interface-conversion strategy provides a practical route for greener, scalable rejuvenation of reclaimed LCO.
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TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Zhuang Sun,Wei Wang,Fanfan Lv,Yuan Gao,Jiayu Yang,Qianying Jia,Kuaishe Wang
Effective lubrication is critical for the hot extrusion of titanium alloys to enhance the surface quality of the workpieces and reduce die wear. This study investigates the high-temperature tribological behavior of sodium silicate coatings with varying SiO 2 /Na 2 O molar ratios on Ti-6Al-4V alloy surfaces. High-temperature friction tests reveal that the combination of elevated temperature and high shear stress promotes the depolymerization of the SiO 4 tetrahedral network. This process leads to an increased concentration of non-bridging oxygens (NBOs) and Q 1 units within the melt, which improves the melt fluidity and facilitates the reflow of the melt into the wear track. Concurrently, the high temperature and shear stress accelerate the diffusion-reaction of sodium ions (Na + ), leading to the in situ formation of layered Na 2 Ti 3 O 7 at the interface between the sodium silicate and the TiO 2 . The synergistic lubrication mechanism of Na 2 Ti 3 O 7 , sodium silicate melt, and TiO 2 is the key to the excellent tribological performance of the sodium silicate coatings. This study provides the theoretical basis for designing silicate-based glass lubricating coatings for titanium alloy hot extrusion.
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Journal of Materials Research and Technology-JMR&T
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2026
·
IF 7.3
Xiaoyuan Luo,Gangyi Zhang,Wensheng Yang,Tinghong Gao,Qian Chen,Yongchao Liang,Bei Wang,Jin Huang,Yunjun Ruan,Yunjie Han,Qingquan Xiao
Titanium (Ti) substrates are commonly used as current collectors or functional supports in all-solid-state batteries and related thin-film devices, but their surface and interfacial state can affect subsequent functional-layer construction and device stability. Carbon films, as carbon-based functional layers, can regulate the interfacial properties of Ti surfaces and provide potential conductive pathways. However, the morphological evolution of magnetron-sputtered carbon films on Ti substrates and its formation mechanism remain unclear. This work combines experimental characterization with molecular dynamics (MD) simulations to investigate the deposition and annealing behavior of carbon films on Ti substrates. Experimental results showed that annealing transformed the carbon film from relatively uniform coverage into a distinct island-like distribution. MD simulations revealed that metastable regions within the carbon film evolved toward more stable configurations through bond breaking, bond formation, and local rearrangement, accompanied by local contraction and densification. Under the combined effects of substrate constraint and interfacial interactions, these structural changes further induced hole expansion and nonuniform coverage, ultimately leading to island-like morphology formation. These results indicate that annealing-induced island formation is not merely surface roughening, but a consequence of thermally driven local contraction, structural densification, and stress relaxation, showing features of early-stage solid-state dewetting. This study clarifies the atomic-scale mechanism of island formation in Ti/C systems and provides guidance for thermal-treatment design of carbon layers on Ti substrates and functional-interface design in high-performance all-solid-state batteries.
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Nature Communications
·
2026
·
IF 18.1
Zhao Yongqi,Wang Pu,Jiang Junjie,Zhao Ziwei,Xiu Aorui,Liu Xiaolong,Zhu Tingyu
Transition-metal oxides offer a low-cost alternative to precious metals for environmental catalysis, yet CO oxidation under humid and sulfur-laden conditions remains challenging due to rapid poisoning. Herein, we report an atomic dispersion of Ti‑decorated MnO x -Fe 2 O 3 catalyst that achieves high activity and remarkable H 2 O/SO 2 resistance. Atomically dispersed Ti provides electron-accepting 3d states from O 2p orbitals, which redistributes and stabilizes selected O 2p states while modifying their hybridization with neighboring Mn/Fe 3d orbitals. The localized electronic restructuring strengthens CO adsorption and facilitates lattice oxygen activation via a Mars-van Krevelen (MvK)-like mechanism, lowering the apparent activation energy to 64.59 kJ/mol. Simultaneously, Ti-O-Fe interfaces weaken SO 2 adsorption (from −1.96 eV to −0.19 eV) and suppress H 2 O competition, retaining >55% CO conversion under 10 vol% H 2 O and 10 ppm SO 2 , far surpassing the parent oxide (<10%). The orbital tuning strategy enables scalable poison resistant catalysts for industrial emission control, reducing reliance on precious‑metal systems.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shiqing Yu,Yong Zheng,Yuze Du,Xi Zhang,Kai Wang,Juncheng Yao,Guangyu Wang
Antireflective coatings (ARCs) with self-cleaning and antistatic functionalities were fabricated using the sol-gel method with a Ti-Zn modified SiO 2 sol. Chain-like Ti-Zn composites were incorporated into SiO 2 nanoparticles exhibiting a dual-size distribution, forming a cross-linked composite structure that enhanced coating hardness while maintaining high transmittance and imparting multifunctional properties. The effects of Ti-Zn sol content on the surface morphology, microstructure, optical performance, mechanical strength, and wettability of the coatings were systematically investigated. The resulting coatings exhibited a hardness of 3H, an adhesion rating of 5B, and a solar-weighted transmittance (T sw ) of 95.31% across the wavelength range of 380–1100 nm, significantly higher than that of bare K9 glass (91.38%). Moreover, the introduction of the Ti-Zn composite sol imparted superhydrophilic properties to the coating (water contact angle, WCA = 1.8°) and facilitated the formation of continuous conductive pathways, reducing the surface resistivity to 3.61 × 10 8 Ω/□. This effectively suppressed electrostatic charge accumulation, thereby mitigating dust deposition. Furthermore, the coating demonstrated excellent multifunctional performance. A self-cleaning efficiency of 97.10% was achieved with a negligible loss in T sw (0.03%), while the haze value remained below 2% during antifogging tests. Additionally, the dust deposition density was reduced to 40.48% of that of bare glass, confirming the enhanced anti-dust performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Shiqian She,Xueqing Shi,Jianfeng Song,Zixuan Huang,Tiantian Zhou,Kun Xiong
Water electrolysis is an important technology for green hydrogen production, but the sluggish kinetics of the anodic oxygen evolution reaction (OER) lead to high overall energy consumption. Using the urea oxidation reaction (UOR) instead of OER has been considered an effective route for reducing potential and treating urea-containing wastewater. Here, we introduced Sn into RuO 2 -TiO 2 /Ti through three methods: electrodeposition, hydrothermal and ion exchange, and constructed a series of NiO-(Sn)-RuO 2 -TiO 2 /Ti electrodes. The systematic characterization showed that Sn was successfully introduced in the form of rutile SnO 2 , and the elements were evenly distributed. The Sn introduction method significantly affected morphology and electrocatalytic performance of electrodes: NiO-(Sn)-RuO 2 -TiO 2 /Ti-E prepared by electrodeposition method exhibited a compact nanosheet structure, high surface roughness and abundant exposed active sites, exhibiting the best activity in HER/OER, while NiO-(Sn)-RuO 2 -TiO 2 /Ti-I prepared by ion exchange method maintained its original morphology, and NiO nanoclusters were evenly dispersed, showing the best performance in UOR. The potential of NiO-(Sn)-RuO 2 -TiO 2 /Ti-I was only 1.39 V ( vs . RHE) at a current density of 100 mA cm −2 , and it operated stably for more than 132 h. When NiO-(Sn)-RuO 2 -TiO 2 /Ti-I was assembled into a HER‖UOR two-electrode system, the cell voltage at 100 mA cm −2 was only 1.65 V, which was 0.26 V lower than that of the traditional HER‖OER. This work reveals the modulating effect of Sn introduction method on the electrocatalytic performance of multi-component oxides, and provides a scalable solution for the advancement of energy-saving hydrogen production coupled with degradation of urea.
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Hongyang Wang,Chengqi Lu,Pengchang Sun,Zilin Cao,Zhongkang Han,Qianhong Shen,Zhongyuan Hu,Xudan Cao,Hui Yang
A Bi₄Ti₃O₁₂/BiOCl heterojunction with a coherent interface was constructed via a room-temperature ion-exchange process. • A Bi₄Ti₃O₁₂/BiOCl heterojunction with a coherent interface was constructed via a room-temperature ion-exchange process. • The photocatalyst exhibits excellent performance for the degradation of high-concentration, recalcitrant antibiotics. A strategy is reported for the in-situ fabrication of a Bi₄Ti₃O₁₂/BiOCl heterojunction with shared atomic layer through simple room-temperature ion-exchange on pure Bi₄Ti₃O₁₂. This strategic interfacial engineering, combined with a Type-II band alignment, the Aurivillius-type Bi₄Ti₃O₁₂ and BiOCl share the Bi₂O₂ 2+ layers at the interface, thereby dramatically accelerating the separation and migration of photo-generated carriers and ultimately significantly increasing the yield of photocatalytic reactive species. Consequently, the optimized composite photocatalyst exhibits exceptional performance in the degradation of high-concentration antibiotics. It achieves remarkable degradation efficiencies of 90.8% for sulfamethoxazole (20 ppm) within 120 min, 92% for tetracycline hydrochloride (40 ppm) and 78.6% ciprofloxacin (15 ppm) within just 30 min. Demonstrating superior photocatalytic performance compared to the previously reported analogous photocatalysts in recent years with respect to antibiotic degradation. Furthermore, the degradation efficiency of the as-prepared photocatalyst also demonstrates outstanding cycling stability, with a reduction of only 3.4% after 4 cycles. Therefore, this coherent Bi₄Ti₃O₁₂/BiOCl heterojunction photocatalyst exhibits immense potential for practical applications in environmental remediation.
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Catalysts
·
2026
·Vol. 16
·期 9
·806
·
IF 4.5
Yifei Wang,Ruoxin Li,Bin Jia,Jun Liu,Guojie Zhang
Low-temperature sintering flue gas contains both nitrogen oxides (NOx) and carbon monoxide (CO), requiring bifunctional catalysts for concurrent pollutant abatement. Herein, CuSmTi composite oxides with an identical nominal composition were synthesized via impregnation, mechanical grinding, and sol–gel methods to examine the effects of preparation route on their structure, surface properties, and catalytic performance in coupled NH3-SCR and CO oxidation. CuSmTi-SG exhibited the best performance, achieving >40% NOxconversion at 125 °C, complete NOxand CO conversion at 200 °C, and nearly 100% N2selectivity over 100–300 °C, with stable performance over 24 h. It possessed a higher surface area (131.4 m2g−1), pore volume (0.230 cm3g−1), and smaller TiO2crystallite size (8.5 nm) than the other catalysts. Spectroscopic analyses showed that sol–gel synthesis altered the surface electronic states of Cu and Sm species, resulting in a higher Cu+fraction and greater amounts of medium-to-strong Lewis acid sites and labile surface oxygen species. In situ DRIFTS indicated that CO oxidation proceeded predominantly via a Mars–van Krevelen mechanism over Cu+sites, whereas NH3-SCR mainly followed an Eley–Rideal pathway. CO and NH3preferentially interacted with different surface sites, resulting in limited mutual inhibition. These results demonstrate that the preparation route can modify the structure and surface chemistry of CuSmTi catalysts without changing their nominal composition, thereby affecting their performance in low-temperature NOxand CO abatement.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengjia Zhou,Ziyan Cui,Yun Liu,Dan Wang,Yanzhou Li,Junwei Zhao,Wenwu You
In this study, a highly sensitive photoelectrochemical (PEC) immunosensor for the detection of carcinoembryonic antigen (CEA) utilizing core-sheath-type TiO 2 @NH 2 -MIL-125(Ti) nanocone array heterostructures was developed. The immunosensor was constructed by depositing NH 2 -MIL-125(Ti) as a sheath onto FTO/TiO 2 nanocones through seed-assisted solvothermal synthesis. The TiO 2 @NH 2 -MIL-125(Ti) heterostructure showcased superior PEC detection capabilities for CEA, leveraging the quantum and tip effects of the TiO 2 nanocones along with the broad-spectrum absorption of NH 2 -MIL-125(Ti), which collectively enhanced light utilization and photoelectric conversion efficiency. The internal electric field at the NH 2 -MIL-125(Ti)/TiO 2 interface enabled efficient photogenerated electron transfer, eliminating the need for external bias and enhancing photocurrent. The antibody-functionalized surface effectively captured CEA, resulting in a clear decrease in photocurrent. Under optimized conditions, the immunosensor exhibited a linear response to CEA in the range of 0.1 pg/mL to 100 ng/mL with a remarkable detection limit of 0.54 fg/mL. The developed PEC immunosensor demonstrated high stability and excellent reproducibility, providing an innovative strategy for the development of sensitive photoactive heterojunction materials for biomarker immunosensing applications.
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Biomaterials Science
·
2018
·Vol. 6
·期 9
·2460-2471
·
IF 5.831
Xiuhua Wang,Lei Tan,Xiangmei Liu,Zhenduo Cui,Xianjin Yang,Kelvin W. K. Yeung,Paul K. Chu,Shuilin Wu
Near infrared (NIR) light induced photodynamic antibacterial therapy (PDAT) is a promising antibacterial technique in rapid in situ disinfection of bacterially infected artificial implants due to its penetration ability into tissues. However, the lower oxygen content in vivo may restrict the yields of reactive oxygen species (ROS), thus reducing the antibacterial efficacy of PADT significantly. Herein, liposome encapsulated photosensitizers (PS), IR780 and perfluorohexane (PFH), have been constructed on the surface of Ti implants via a covalent linkage to overcome this issue. Thanks to the high oxygen capacity of PFH, more ROS can be generated during NIR irradiation regardless of the low content of oxygen in vivo. As a result, in vitro tests demonstrated that 15 minutes of 808 nm near-infrared irradiation could achieve a high antibacterial efficacy of 99.62% and 99.63% on the implant surface against Escherichia coli and Staphylococcus aureus, respectively. By contrast, the PDAT system without PFH modification shows a lower antibacterial efficacy (only 66.54% and 48.04%, respectively). In addition, this enhanced PDAT system also possesses great biocompatibility based on the in vitro and in vivo subcutaneous assays. This surface system makes it possible for rapid bacteria-killing in artificial implants that have been implanted in vivo under local conditions with lower oxygen content.
研究领域:
生物医学工程
·
材料科学
·
微生物学
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Boyu Liu,Tengfei Wang,Qing Pang,Jun Yang,Haidong Liu,Hongyu Wang
To improve the energy density of s ingle-crystal LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NMC523) by increasing the charging cut-off voltage presents a big challenge since the material degrades significantly at high voltage (>4.3V). A simple method to enhance the high-voltage electrochemical properties of single-crystal NMC523 was proposed by introducing a mesoporous TiO 2 coating and Ti doping. The specific discharge capacity for the modified NCM523-M-TiO 2 -0.5 sample achieves 182.81 mAh g −1 at a 0.1 C rate within the 3.0–4.5 V range. Furthermore, the capacity retention rate was 80.69 % after 200 cycles at a charge/discharge rate of 1 C, significantly higher than that of bare NCM523, which exhibited values of 181.36 mAh g −1 and 46.40 %. In detail, the mesoporous TiO 2 coating shields the cathode from the electrolyte, enhancing the stability at the interface and promoting the movement of lithium ions. Additionally, Ti doping increases lattice spacing and stabilizes the layered structure. This research will inform the design of high-performance cathode materials for Li-ion batteries.
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