CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangyuan Sun,Haibo Wu,Chengwei Jiang,Yonghao Chen,Yanan He,Shiqi Zu,Fengyu Su,Yanqing Tian,Yan Jun Liu
Photochromic and electrochromic devices have attracted remarkable attention due to their advantages of low power consumption, eye-friendliness, and broad application potential. However, developing dual-responsive devices with nice memory effect and rapid switching ability remains challenging. Here we report a novel strategy for fabricating dual-responsive photo-electrochromic device (PECD) based on TiO 2 -Prussian blue (PB) composite film and a novel extended viologen FHP . Exploiting the photocatalytic properties of TiO 2 , we successfully fabricated dual-responsive thin films and incorporated FHP as a complementary material to enhance the performance of the device. Notably, the resultant PECD exhibited remarkable performance, including long optical memory (33.91 h), fast response (4.6 s for coloring, 10.4 s for bleaching), high contrast (ΔT is 77.2 % at 692 nm), and excellent cycling stability (ΔT loss is smaller than 3.1 % after continuous working for 1000 cycles), highlighting their potential for advanced optical applications.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Yunwu Yu,Yan Wu,Yong Yuan,Yan Wang,Changwei Xu,Yanfeng Fang,Yaxin Gu,Peng Liu,Ye Wan,Lihua Wang,Xiaowei Sun
Based on the previous study, the properties, separation efficiencies, and anti-fouling performances of TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membrane made via non-solvent-induced phase separation were investigated. SEM, contact angle measurement , ATR-FTIR, and other methods were used to characterize the membranes, and then the pure water flux (PWF) and dye rejection were measured. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes were prepared by stepwise solution blending method. Compared to the pristine PEEKWC/PEI cross-linked ultrafiltration membrane, the anti-fouling and pure water flux performances were enhanced as the addition of TiO2 nanoparticles. The pure water flux of TiO 2 nanoparticle embedded membranes was significantly increased and could even reach 3368.2 LMH at 5 bar much greater than that of the pristine PEEKWC/PEI ultrafiltration membrane (1423.8 LMH), remaining a retention rate for BBR higher than 98.5%. And the TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited a certain degree of increase of FRR (higher than 80%) after UV illumination. After a series of characterisation, the dye wastewater treatment property of membranes was assessed through filtration of Coomassie brilliant blue and Congo red solutions and researches were conducted on the anti-fouling capabilities of membranes. The TiO 2 nanoparticle embedded PEEKWC/PEI cross-linked ultrafiltration membranes exhibited self-cleaning efficiency with lower irreversible fouling ratio. The pure water flux recovery ratio following dye fouling was higher after being exposed to UV irradiation, which could be attributed to the TiO 2 nanoparticles' photocatalytic destruction of organic pollutants .
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DALTON TRANSACTIONS
·
2025
·Vol. 54
·期 8
·3467-3477
·
IF 3.3
Wenhui Hu,Zhongxin Song,Lingna Sun,Lei Zhang,Qianling Zhang,Xiangzhong Ren,Yongliang Li
Efficient separation of photogenerated charge carriers is essential for maximizing the photocatalytic efficiency of semiconductor materials in oxygen evolution reactions (OER). This study presents a novel trimetallic photocatalyst, MIL-100(Fe)/TiO2/CoOx, synthesized through a facile microwave-assisted hydrothermal method followed by atomic layer deposition (ALD). The porous MIL-100(Fe) serves as a support for the sequential deposition of TiO2 and CoOx layers via ALD, which enhances electron–hole pair separation and minimizes their recombination. Characterization using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) confirms the uniform deposition of TiO2 and CoOx layers on the MIL-100(Fe) surface. The optimized photocatalyst, processed with 20 deposition cycles of Co, exhibits exceptional photocatalytic OER performance, with an oxygen evolution rate of 558.3 μmol g−1 h−1. This enhancement in activity is attributed to the synergistic interaction between the spatially separated TiO2 and CoOx cocatalysts, which facilitates efficient charge transfer and increases the number of active sites. These findings highlight the potential of ALD-fabricated heterostructures in the development of advanced photocatalysts for sustainable energy production.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
X.L. Xu,M.Y. Wang,H.T. Jiang,W.W. Liu,G.R. Sun,W. Ma
The high working temperature of metal oxide semiconductors hinders its application in flexible sensing devices. In this paper, a UV-activated flexible sensor operating at room temperature (RT, 25℃) is first reported based on SnO 2 nanoparticles embedded in photo-catalytic TiO 2 nanorods matrix. The UV-irradiated SnO 2 /TiO 2 sensor exhibits excellent selectivity (109 ppm, 37 %) to CH 3 COOH and reduced response/recovery time (12 s/41 s). The excellent RT flexible sensing properties are attributed to the synergistic action of UV-365 nm irradiation, the hetero-embedded microstructure and innovative terpineol binder. UV irradiation generates substantial e h υ − - h h υ + pairs, which serve as active sites to promote the chemisorption and redox reactions. Additional activation energy helps to improve adsorption/desorption kinetics. The heterojunction provides abundant channels, facilitating the separation and transfer of photogenerated carriers. The effect of relative humidity (RH) and temperature variations around RT on the sensor response towards CH 3 COOH are investigated. Under low-RH (35 %-45 %) and high-RH conditions (above 45 %), 1 % RH change has the same effect on the sensor response than 7.2 ppm and 59.4 ppm CH 3 COOH, respectively. 1°C temperature change exhibits the same effect than 17.9 ppm CH 3 COOH. Such a noise effect is by far not suitable for real-world applications. In addition, the response to 109 ppm CO reaches up to 89.5. Therefore, the sensor is seriously disturbed by CO and further research is needed. Above all, UV assistants, hetero-composites combining with innovative microstructure design are expected to be a collaborative enhancement strategy for MOSs-based RT flexible sensors.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhendong Yu,Jingyu Wu,Kaikai Li,Peiwen Wu,Xiaoxiao Yu,Minmeng Tang,Haiyan Liu,Zhichang Liu,Wenshuai Zhu,Chunming Xu
Oxidative desulfurization is an important non‑hydrogen desulfurization technology, but traditional TiO 2 catalysts are subject to the weak acidity and weak adsorption ability towards alkaline sulfide molecules, limited by the long reaction time for deep desulfurization. Herein, based on the principle of Lewis acid-base theory, this work reasonably designs the SiO 2 @TiO 2 core-shell catalyst, which combines excellent catalytic oxidative desulfurization activity and product separation performance. SiO 2 can regulate the acidity of TiO 2 and enhance the enrichment ability of substrate molecules, enhancing the charge transfer process and improving the catalytic performance of TiO 2 . Through systematic characterization, it is confirmed that the Lewis acidity of the core-shell structure originates from unsaturated Ti sites. And the thickness of the TiO 2 shell can be controlled to adjust the surface amounts of acid sites, strengthening the adsorption process of alkaline dibenzothiophenes. The mechanism research reveals the electron transfer between the SiO 2 core and the TiO 2 shell and the generated unsaturated Ti 3+ /Ti 4+ produce a synergistic effect. The generation rates of hydroxyl radicals(·OH) and alkoxy radicals (·OR) are accelerated while changing the Lewis acidity, efficiently adsorbing and oxidizing DBTs. The work expands the application of easy-separation mild Lewis acidic TiO 2 composite materials in the field of catalytic oxidation.
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ACS Catalysis
·
2025
·
IF 13.1
Ziyang Chen,Hua Tong,Yun Zhao,Jie Cui,Lei Zhou,Jiale Zou,Fuqiang Zhou,Peirong Chen,Daiqi Ye,Limin Chen
TiO2 as a reducible metal oxide has been extensively employed as a support for noble and transition metals. Numerous studies have demonstrated that optimizing metal–TiO2 interactions can significantly enhance the catalytic performance. Meanwhile, the weak metal–support interaction between Cu and TiO2 generally results in unsatisfactory catalytic performance for the hydrogenation of CO2 to methanol. Herein, through support facet and defect engineering, the electron transfer from TiO2 to Cu nanoparticles (NPs) is successfully constructed over Cu/TiO2 (001) catalysts, enabling a sharply enhanced methanol yield of about 7.2% at 5 MPa and 280 °C. Detailed characterizations reveal that the regulation of support defects and the catalyst preparation process boost the defect density over TiO2 and then facilitate the electron transfer from TiO2 to Cu NPs and the highly dispersed electron-rich Cu NPs. This, in turn, promotes the dissociation and spillover of H2, further producing support defects and achieving dynamic regulation. Ultimately, these synergistic interactions drive the hydrogenation of CO2 to methanol. These findings not only demonstrate the Cu/TiO2-based catalyst as one of the most promising catalysts for CO2 hydrogenation to methanol but also establish a generalizable strategy for enhancing catalytic performance through support facet and defect-engineered electron transfer modulation.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Yingrui Wu,Junyan Zhang,Binghao Chen,Hexing Li,Chao Tang
Nanoparticles are presently considered to be high-potential additives in insulation materials. Surface modifiers can not only improve the compatibility between nanoparticles and natural ester but also enhance the insulation performance of the insulation liquid. In this work, a mixture of two natural ester insulation oils (rapeseed oil + palm fatty acid ester) doped with 3-aminopropyltriethoxysilane (KH550)-TiO2 nanoparticles was prepared, and a 56-day thermal aging experiment was implemented. Moreover, the molecular dynamics simulation was applied to investigate the improvement mechanism of the physicochemical and electrical properties from a microscopic perspective. The experimental results revealed that KH550-modified nano-TiO2 particles could reduce the generation of microwater and acidic substances during the aging process of the oil–paper insulation system, retard the degradation of the system, and improve the thermal stability and insulation performance. At the end of the thermal aging, a decrease of breakdown voltage by 7.3% and an increase of acid value by 17.3% were observed in the modified insulation oil. On the contrary, the pure insulation oil decreased the breakdown voltage by 26.96%, and the acid value increased by 28.38%. Furthermore, the molecular simulation results determined that KH550-TiO2 could combine with polar molecules through hydrogen bonds, adsorb polar molecules in insulation oil, prevent their diffusion into cellulose insulation paper, and delay the aging and decomposition of insulation paper. Therefore, the modified nanoparticles have remarkably enhanced the antithermal aging performance of the oil–paper insulation system, which provides a considerably greater application prospect for nanomodification insulation in liquid medium.
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WEAR
·
2024
·
IF 5.3
Zhihui Zhang,Jianxin Deng,Yang Lu,Jiaxing Wu,Ran Wang,Yichen Bao
In this paper, the electrojet mask in-situ forming technology was used to prepare (CF x ) n /CaF 2 -ZrO 2 /TiO 2 composite films with different ZrO 2 /TiO 2 texture distributions, to improve the adhesion properties and tribological performance of (CF x ) n /CaF 2 lubricant films. The microstructure, mechanical properties, and reciprocating wear characteristics between the composite films and 304 stainless steel counterparts were studied. The results showed that the textured hard film significantly improved the adhesion strength of the soft film and the tribological properties of the composite film. The composite film sample B had the lowest friction coefficient (∼0.100) and a lower film wear rate of ∼2.85 × 10 −7 mm 3 N −1 mm −1 , and also showed good self-lubricating properties in the high-temperature wear process. Sample C had a lower friction coefficient of ∼0.107 and the lowest film wear rate of ∼2.75 × 10 −7 mm 3 N −1 mm −1 . Compared with untextured composite film sample DC, sample B showed a 21.3 % reduction in friction coefficient, while sample C showed a 54.8 % decrease in film wear rate. This was because the surface texturing treatment of hard films enhanced the storage and flow of lubricant particles, and maintained a stable self-lubricating film during reciprocating wear. Moreover, (CF x ) n and CaF 2 have a synergistic effect in a wide temperature range of 25 °C–600 °C.
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Materials
·
2024
·Vol. 17
·期 23
·5824
·
IF 3.1
Guoyu Zhang,Lu Li,Yanxin Nan,Peng Li,Tao Deng,Zhipeng Lei,Yuanyuan Li,Jianhua Zhang
In this work, the effects of different sintering temperatures and TiO2concentrations on the dielectric properties of ZrO2and Nb2O5pre-doped CaCu3Ti4O12(CCTO) ceramics were investigated. These doped ceramics were sintered at temperatures of 1020, 1030, and 1040 °C, exhibiting the lowest dielectric loss of 0.01, which consistently remained below 0.03 across a wide frequency range from 10 to 105Hz. Simultaneously, they maintained a high dielectric constant of more than 3000 and remarkably met the requirements for an X8P capacitor (Δε′ ≤ ±10% at temperature range from −55 to 150 °C). It was clarified that TiO2doping increased grain boundary resistance, leading to the reduced dielectric loss, and elevated the grain boundary activation energy, thereby enhancing the temperature stability. The TiO2-doped CCTO-based ceramics also demonstrated reduced sensitivity to variations in sintering temperature, highlighting their excellent manufacturability. This characteristic holds great promise for the fabrication of CCTO-based ceramics, which usually exhibit poor repetitiveness.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yao Wang,Yamin Li,Bing Xu,Jiaying Ren,Kangkang Wang,Liang Zhang,Zhixian He,Wen Zhang,Shengnan Zhang
Titanium dioxide (TiO 2 ) ceramic coating, characterized by high thermal conductivity and remarkable chemical stability, leading to extensive application in providing electrical insulation within superconducting coils. However, the development of such ceramic insulation coatings to facilitate the preparation of high-performance superconducting magnets is extremely challenging, due to the complex heat treatment process of bismuth system high temperature superconductivity (HTS) wires. A novel strategy for fabricating a porous TiO 2 insulation layer with a three-dimensional (3D) reticular architecture based on highly dispersed ceramic slurry has been reported herein. To enhance the structural strength and oxygen permeability of the coating, polyethylene glycol and oligomeric ethyl silicate were introduced as modifiers to construct a grid-like porous framework. The as-prepared insulation coating possesses micron-sized pore and crack structures. The high-temperature stability of the insulation layer and its compatibility with the heat treatment of Ag-sheathed Bi-2223 wire was verified by measuring the effect of coating on the critical current. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS) show that this insulation coating with a thickness of approximately 25 μm can significantly inhibit the diffusion of metal sheath components and Bi. In addition, the TiO 2 insulation coating has also been successfully prepared on Bi-2223 tape by a reel-to-reel coating system. The results indicates that the TiO 2 insulation coating has great application potential as an insulation material for HTS magnets and provides new insights for the development of effective insulation material for Bi-2212 wires.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Lu Yang,Xi Chen,Jingxiang Zhang,Haoliang Zhang,Qiuying Zhao,Haiyan He,Huajie Huang,Yanjie Wang
High-efficient and recyclable piezo-photocatalysts are garnering substantial attention in line with the advancements in environmental purification. Herein, a novel micropatterned piezo-photocatalytic composite film, wherein BaTiO 3 @TiO 2 core-shell nanoparticles are embedded within porous poly(vinylidene fluoride) matrix, is developed. The impressive synergy between photocatalytic and dual piezocatalytic effects emanating from integrated components contributes to significantly amplified piezo-photocatalysis process. Moreover, by modulating the geometric structure of nanofiller along with topographical pattern design, one can further harness the piezo-photocatalysis effect upon electrical poling. As a result, the newly-developed composite film exhibits distinguished piezophotocatalytic activity, i.e., the degradation efficiency of highly-concentrated Methyl Orange (MO) solution (C 0 = 10 mg/L, 100 mL) reaches 97.3 % within 90 min, implying its viability as high-performance piezo-photocatalysts.
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FUEL
·
2024
·
IF 6.7
Biao Ran,Yun Wu,Kaiyang Zhang,Rui Yao,Jinping Li,Guang Liu
In the evolution of proton exchange membrane (PEM) electrolysis, the development of durable electrocatalysts for the acidic oxygen evolution reaction (OER) is crucial. This work introduces an electrocatalyst with a core–shell architecture, consisting of amorphous iridium oxide (IrO x ) supported on lanthanum (La) and niobium (Nb) co-doped titanium dioxide (denoted as La, Nb-TiO 2 @IrO x ). The resultant La, Nb-TiO 2 @IrO x , synthesized via a hydrothermal method, exhibits enhanced OER activity and remarkable durability in acidic media. The theoretical calculations provide insight into the enhanced performance of La, Nb-TiO 2 @IrO x , revealing a narrowed bandgap and improved conductivity due to co-doping. Additionally, there is an increase in charge transfer and binding energy at the heterointerface. As a result, electrochemical evaluations show a significant reduction in overpotential and enhancement in long-term stability, achieving an overpotential of 234 mV at 10 mA cm −2 and maintaining impressive stability for 150 h. These findings underscore the potential of La, Nb-TiO 2 as a robust platform for acidic OER electrocatalysts, offering valuable insights into the design of durable and efficient systems for energy conversion applications and advancing the development of next-generation technologies.
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