CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jimin Du,Mengke Yang,Fangfang Zhang,Xuechun Cheng,Haoran Wu,Huichuang Qin,Qingsong Jian,Xialing Lin,Kaidi Li,Dae Joon Kang
Photoelectrochemical (PEC) water splitting using high-performance catalysts shows considerable promise in generating environment-friendly hydrogen energy. Its practical applications, however, suffer from several shortcomings, such as low photocurrent density, large onset-voltage value, and poor durability. In this study, CuS and CdS quantum-dot-cosensitized porous TiO 2 -based PEC catalysts (CuS-CT) have been successfully synthesized via in situ sulfuration of CuO and CdO coexisting inside a porous TiO 2 monolith by a hydrothermal method . Compared to porous TiO 2 , CuS-sensitized porous TiO 2 (CuS-TiO 2 ), and CdS-sensitized porous TiO 2 (CdS-TiO 2 ) in terms of PEC performance, the CuS-CT photoanode exhibited a significantly high anodic photocurrent for water splitting under simulated sunlight radiation. The photocurrent produced by the optimized sample of 7% CuS-5% CdS-TiO 2 (7% CuS-CT) was nearly 2.7 times higher than that of pure porous TiO 2 at 1.0 V versus a reversible hydrogen electrode (RHE). Porous TiO 2 possesses large surface areas that can drive fast electrolyte transport and afford more surface reaction active sites. On the other hand, CuS and CdS quantum dots not only broaden the visible light absorption range, but also improve photoinduced electron-hole separation efficiency. The co-sensitized multi-nanostructures photoanodes lead to a remarkable and promising application in PEC water splitting reactions.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Guorong Zhang,Jiaxi Liu,Sheng Wei,Fen Xu,Lixian Sun,Yongpeng Xia,Hehui Wang,Jinfan Wu,Yuan Gao,Qiwei Shao,Yiting Bu,Yanxun Guan,Lumin Liao,Taigen Liang,Lina Qin
Herein, a novel TiO 2 /CN heterojunction material has been prepared by one-step bubble template-assisted calcination to enhance the hydrogen storage capability of LiAlH 4 . The TEM, XPS and UPS analysis confirm that a heterostructure is formed between TiO 2 and g-C 3 N 4 successfully. The experimental findings indicate that the TiO 2 /CN significantly enhances the dehydrogenation performance of LiAlH 4 . For instance, the LiAlH 4 -7 wt% TiO 2 /CN starts to dehydrogenize at 76 °C (94 °C less than pure LiAlH 4 ) and releases 6.5 wt% H 2 at 200 °C. Meanwhile, LiAlH 4 -7 wt% TiO 2 /CN releases 4.9 wt% H 2 at 120 °C within 50 min. The mechanism analysis illustrates that AlTi 3 N is formed in situ during ball-milling. And density functional theory (DFT) calculation results reveal that the AlTi 3 N can weaken the Al-H bonds in LiAlH 4 through interfacial charge transfer. Furthermore, the TiO 2 /CN heterostructure creates an internal electric field that generates an electron-rich layer. As a result, the negative electron layer at one end of the TiO 2 /CN heterojunction has an increased affinity for H, which enhances the dehydrogenation reaction of LiAlH 4 . Clearly, both the TiO 2 /CN heterostructure and AlTi 3 N contribute to the improvement of the dehydrogenation properties of LiAlH 4 .
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JOURNAL OF ELECTRONIC MATERIALS
·
2025
·
IF 2.5
Li Lingyu,Ma Qian,Zhao Dongheng,Zhang Huayushuo,Li Bolong
Recently, the development of an n-pentane-sensing product has always been plagued by the lack of suitable inorganic material with good gas-sensing response and selectivity at low operating temperatures. In this work, Ti-MIL-125-induced one-dimensional tubular In 2 O 3 /TiO 2 heterostructures have been fabricated by a facile electrospinning method and a subsequent heat-treatment process. Obvious morphological evolution from a fibrous to a tubular shape with the presence of In 2 O 3 -TiO 2 heterojunctions can be adjusted by varying the added amount of the Ti-ML-125 component. Compared with pure In 2 O 3 , the optimal In 2 O 3 /TiO 2 composites exhibit a blue-shifted energy band (2.52 eV) and an increased specific surface area (227.70 m 2 /g), as well as the enhanced gas-sensing performance on various concentrations of n-pentane. For example, In 2 O 3 /TiO 2 -3% can not only display excellent long-term stability and humidity stability but also has a high response of 670–100 ppm n-pentanol at 50°C, much larger than that of pure In 2 O 3 (50) at 150°C. Significantly, In 2 O 3 /TiO 2 -3% can still reach the high response of 197–100 ppm n-pentanol at room temperature. According to density functional theory (DFT) calculations, the enhanced gas-sensing mechanism is mainly attributed to the combination of the distinctly increased surface active sites through the regulation of morphology and the introduction of effective In 2 O 3 -TiO 2 heterojunctions, which can be beneficial to improving the surface adsorption/desorption characteristics and the electron transport between n-pentanol and the sensing material interface. Graphical
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ANALYTICA CHIMICA ACTA
·
2024
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IF 5.7
Haitao Xiong,Mengyang Wang,Ruirui Qiang,Yingchun Wu,Xingwang Zheng
Photodeposited TiO 2 /Ag nanocomposites were generally used to be a friendly catalyst for degrading organic contaminant in environmental field. However, electrochemiluminescence (ECL) sensing analysis based on photocatalysts remains a significant challenge. Herein, polyvinylimide (PEI)-TiO 2 /Ag nanocomposites (PEI-TiO 2 /AgNCPs) film with reduced graphene oxide(r-GO) was constructed as a sensing interface for copper(II) ECL detection. TiO 2 /Ag nanocomposites was prepared by reversed phase microemulsion method and photodeposition technique. Moreover, it was discovered that a small amount of Cu 2+ could obviously boost the ECL signal of ninhydrin-hydrogen peroxide system. Signal amplification was achieved by using the synergistic effect between r-GO and TiO 2 /Ag nanocomposites, and the efficiently concentrated effect of PEI to Cu 2+ . Furthermore, the investigation showed that ECL mechanism of ninhydrin-hydrogen peroxide system was attributed to the generated hydroxyl radical and superoxide anion during the several type of reactions. Thus for the first time, an ultrasensitive ECL approach for detecting Cu 2+ could be performed using ninhydrin as an ECL signal probe and hydrogen peroxide as a co-reaction reagent. Under the suitable circumstances, the proposed method showed an excellent linear relationship in the concentration range of Cu 2+ from 1.0 fM to 5.0 nM. Detection limit was estimated to be as low as 0.26 fM. The sensing interface expanded the application of photodeposited TiO 2 /Ag nanocomposites in ultrasensitive ECL detection. It has potential applications in other components and biological analysis.
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ACS Biomaterials Science & Engineering
·
2024
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IF 5.4
Yunzheng Du,Mengya Chen,Biao Wang,Yamin Chai,Lichun Wang,Nan Li,Yanjia Zhang,Zhuang Liu,Chen Guo,Xinbang Jiang,Boya Ma,Zimeng Wang,Ziying Tian,Lailiang Ou
The use of hemoperfusion adsorbents for the removal of bilirubin in patients with liver failure has become a critical treatment. However, the insufficient clearance of bilirubin and the possibility of bacterial infection during hemoperfusion limit the application. In this work, we designed a novel antibacterial bilirubin adsorbent (PSVT) through the suspension polymerization reaction between double-bond functionalized TiO2 nanoparticles and styrene. PSVT showed an excellent bilirubin adsorption ability and antibacterial performance, ensuring efficient clearance of bilirubin in liver failure patients during hemoperfusion and preventing bacterial infection. The experimental results indicated that TiO2 was uniformly dispersed in the microspheres, which improved the mesoporous structure and increased the specific surface area. Composite adsorbent PSVT showed an exceptional bilirubin adsorption capacity, with the maximum adsorption capacity reaching 24.3 mg/g. In addition, the introduction of TiO2 endowed PSVT with excellent antibacterial ability; the ultimate antibacterial rates against Escherichia coli and Staphylococcus aureus reached 97.31 and 96.47%, respectively. In summary, PSVT served as a novel antibacterial bilirubin adsorbent with excellent bilirubin clearance capacity and antibacterial performance, providing excellent application prospects for treating liver failure patients.
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Water
·
2025
·Vol. 17
·期 2
·155
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IF 3
Yuanyuan Shi,Yi Xie,Jun Xia,Xiaolin Zhang,Hui Cheng,Jialin Chen
Ubiquitous nitrate (NO3−) in groundwater sources is considered a hazard compound for human health. Photo-catalytic reduction by Ag-TiO2/formic acid/visible light represents an emerging method for NO3−removal without secondary pollution. In this contribution, the removal of NO3−by photo-catalytic reduction and the selectivity of N2were systematically investigated under varied conditions, including concentrations of Ag-TiO2, NO3−, and formic acid (HCOOH). The removal efficiency of NO3−reached 84.47%, 82.68% of which was converted to N2under the optimal conditions: NO3−at 50 mg-N/L, Ag-TiO2at 1.0 g/L, HCOOH at 20.05 mmol/L, and reaction time at 120 min. The removal of NO3−was enhanced mainly by CO2−rather than by photo-generated electrons or HCOO−. The results of this study indicated that the production of ·CO2−by Ag-TiO2and HCOOH under visible light catalysis can achieve efficient NO3−removal.
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APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Yi Ye,Linxi Wang,Haiyan Li,Jianhong Luo
Oily wastewater has become one of the great threats to the environment. Membrane separation technology has become a research focus in wastewater treatment due to its advantages in environment protection, low sedimentation cost, low energy consumption and reusability. NPA/ZnMgAl-LDHs (NPA, nylon film material loaded with nano-TiO 2 particles, LDHs , layered double hydroxides) material based on nylon film material (PA) was synthesized using a two-step method. Various characterization methods confirmed the successful introduction of TiO 2 and ZnMgAl-LDHs. The testing of water contact angle (WCA) and underwater oil contact angle (UOCA) confirmed that the original PA substrate possesses hydrophobicity and lipophilicity. The superhydrophilicity and superoleophobicity of NPA/ZnMgAl-LDHs material were brought by the introduction of TiO 2 and ZnMgAl-LDHs. NPA/ZnMgAl-LDHs material shows stable and efficient separation efficiency (> 99%), and exhibits high separation flux in simple oil-water separation and oil in water emulsion demulsification. In addition, its separation efficiency is almost unaffected under environments of different pH, and the separation flux remains at a high level. The photocatalytic activity is another satisfactory result of NPA/ZnMgAl-LDHs material. Methyl orange solution was effectively degraded by NPA/ZnMgAl-LDHs material within 120 min, and the efficiency is up to 99.09%.
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Nanoscale
·
2024
·Vol. 16
·期 22
·10727-10736
·
IF 5.8
Peijiao Chen,Zhijun Li,Pengze Wang,Yuxin Yao,Tianwei Dou,Yang Qu,Liqiang Jing
The photocatalytic water-mediated CO2 reduction reaction, which holds great promise for the conversion of CO2 into valuable chemicals, is often hindered by inefficient separation of photogenerated charges and a lack of suitable catalytic sites. Herein, we have developed a glycerol coordination assembly approach to precisely control the distribution of atomically dispersed Cu species by occupying Ti-defects and adjusting the ratio between Cu species and Ti-defects in a hierarchical TiO2. The optimal sample demonstrates a ∼4-fold improvement in CO2-to-CO conversion compared to normal TiO2 nanoparticles. The high activity could be attributed to the Ti defects, which enhance the photogenerated charge separation and simultaneously facilitate the adsorption of water molecules, thereby promoting the water oxidation reaction. Moreover, by means of in situ EPR and FTIR spectra, we have demonstrated that Cu species can effectively capture photogenerated electrons and facilitate the adsorption of CO2, so as to catalyze the reduction of CO2. This work provides a strategy for the construction of atomic-level synergistic catalytic sites and the utilization of in situ techniques to reveal the underlying mechanism.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yongjing Wu,Jiahuang Zhang,Jiaqi Luo,Mingliang Wang,Shidong Cai,Qingrui Cai,Dong Wei,Jun Ji,Zhirong Zhang,Xiaodan Li
The performance of perovskite solar cells (PSCs) has rapidly improved, largely due to advancements in mitigating inherent defects and enhancing interface carrier transport properties. Herein, we provide a facile method to improve the morphology of TiO 2 ETLs, suppress defects at interface, and tailor energy level alignment to enhance carrier separation and extraction efficiency by introducing potassium bitartrate (KBT) into the TiO 2 electron transport layers (ETLs), achieving high-efficiency and stable PSCs. KBT molecules can enhance the surface smoothness of TiO 2 ETLs, resulting in denser and more uniform perovskite films. In addition, the carboxyl groups, hydroxyl groups, and potassium cations containing in KBT improve charge transport efficiency at TiO 2 /perovskite interface by reducing non-radiative recombination centers in TiO 2 and perovskite bottom as well as improving energy level matching. As a result, the target PSC exhibits an obvious improvement in performance with a champion efficiency of 23.35 %, which is greatly improved relative to the control (21.66 %). The long-term operational stability is also remarkably enhanced, after 800 h MPPT, PSCs with KBT remain over 80 % of its initial efficiency. PSCs with KBT-doped ETLs exhibit increased efficiency and stability, highlighting potential of KBT as an interface engineering tool for enhancing PSCs performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xin Kang,Jiancong Liu,Dongxu Wang,Chungui Tian,Honggang Fu
CO 2 hydrogenation to hydrocarbons under high space velocity is crucial for industrial applications, but traditional Fe-based catalysts often suffer from the low activity and poor stability. Herein, we report a new tandem catalyst system combining Pt/TiO 2 catalysts with Fe 3 C catalysts for the direct conversion of CO 2 into C 2 -C 4 hydrocarbons under high space velocity. The Pt/TiO 2 component promotes *CO intermediate production with an enhanced Reverse Water-Gas Shift (RWGS) reaction efficiency, providing a highly reactive species for the Fe 3 C catalyst to achieve Fischer-Tropsch synthesis (FTS). By maximizing the contact interface between the Pt/TiO 2 and Fe-based components through a granule mixing configuration, we achieve significant enhancements in both CO 2 conversion rate (24.0 %) and C 2 -C 4 hydrocarbons selectivity (51.1 %) under the gaseous hourly space velocity (GHSV) of 100000 mL g cat −1 h −1 . Besides, excellent stability is achieved by the tandem catalysts with continuous catalysis for up to 80 h without significant decrease in activity. Through modulation of the reduction states of iron oxide, we effectively tune the composition of Fe-based catalyst, thereby tailoring the product distribution. Through this work, we not only offer a promising avenue for reducing CO 2 for efficient CO 2 utilization but also highlight the importance of catalyst design in advancing sustainable chemical synthesis.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xiangyu Tian,Zixu Zeng,Yi He,Lecheng Lei,Chunlin Yu,Xingwang Zhang
The utilization of TiO 2 for the fabrication of transparent photochromic materials is both cost-effective and environmentally friendly. However, it still poses challenges due to the rapid recombination of electron-hole pairs and poor organic-inorganic compatibility. Oxygen vacancies play a crucial role in sustaining sacrificial electron donors for hole scavenging, demonstrating great potential in enhancing photochromic performance. Herein, Rb doping and lattice strain are applied to synergistically engineer oxygen vacancies, considering lattice oxygen release is influenced by charge neutrality and oxygen atom coordination environment. Furthermore, the particle surface is modified using composite siloxanes to ensure monodispersion and enhance organic-inorganic compatibility. Structural analyses and theoretical calculations indicate that Rb doping and epitaxial strain synergistically reduce the oxygen vacancy formation energy and promote the chemical adsorption of diethylene glycol (DEG) on the TiO 2 surface for hole scavenging. The designed DEG-added Rb-TiO 2 /TB-CS (TB means extra titanium butoxide, CS means composite siloxanes) nanodispersion exhibits a significant optical modulation amplitude exceeding 90% at 650 nm, rapid response within 60 s, and stable reversibility in color-switching (50 cycles). Moreover, utilizing Rb-TiO 2 /TB-CS with DEG ligands as a responsive material enables the fabrication of transparent photochromic polyacrylate-based hybrid films, polyvinyl alcohol-based hydrogels, and hydroxyethyl cellulose-based rewritable papers, showcasing its immense potential for diverse applications.
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TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Zhikai Fan,Shanshan Wang,Yihui Xiang,Yanfei Liu,Zeyang Yu,Xiangyu Ge,Wenzhong Wang
Molybdenum dithiocarbamate (MoDTC) can significantly reduce friction and wear through the formation of lubricious tribofilm by decomposition of MoDTC, but it is difficult to regulate the tribochemical behaviors. In this study, TiO 2 nanoparticles was used as nano-additive combined with MoDTC, leading to reduced friction and wear under 50 N. The addition of TiO 2 with proper concentration can promote the formation of lubricious Mo-content tribofilm. Meanwhile, TiO 2 in tribofilm also lead to enhanced wear-resistance. Moreover, the dynamic evolution of the tribofilm is also investigated under varied conditions to elucidate the synergetic lubrication mechanisms between MoDTC and TiO 2 . These findings offer fundamental understandings of the lubrication mechanisms of MoDTC when combined with nano-additives from both tribochemical and tribomechanical viewpoints.
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