Journal of Materials Chemistry A
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2015
·Vol. 3
·期 43
·21630-21636
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IF 7.443
Xiaofan Zhang,Bingyan Zhang,Kun Cao,Jérémie Brillet,Jianyou Chen,Mingkui Wang,Yan Shen
Converting solar energy into hydrogen via photoelectrochemical water splitting has attracted significant attention during the past decades. Herein, we design a novel core/shell TiO2@BiVO4 photoanode in combination with a CH3NH3PbI3-based perovskite solar cell for unassisted solar water splitting. Compared to pristine TiO2 NRs, the resulting TiO2@BiVO4 film exhibits a 3.25-fold enhanced photocurrent density (∼1.3 mA cm−2) under irradiation (xenon lamp coupled with an AM 1.5 G filter, 100 mW cm−2). This significant enhancement is attributed to the excellent light absorption properties of BiVO4 and a fast electron transfer process in the single crystalline TiO2 NRs. Especially, the type-II band alignment between the BiVO4 and rutile TiO2 NRs provides a large driving force for electron injection from the BiVO4 to the TiO2. The perovskite solar cell-TiO2@BiVO4 photoelectrochemical tandem device exhibits an overall solar-to-hydrogen efficiency of 1.24%, comparable to other TiO2-based PV/PEC systems.
研究领域:
材料科学
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能源转换技术
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光催化
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2016
·Vol. 81
·期 3
·850-858
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IF 1.473
Chen Peng,Liang Xiaoping,Wang Jun,Zhang Di,Yang Shanmin,Wu Weishan,Zhang Wei,Fan Xiaowei,Zhang Dequan
Abstract To develop high performance mixed matrix gel polymer electrolyte, the synergistic effect of blending PVDF (PEO/PVDF weigh ratio of 85:15) and adding nano-TiO 2 (0.5–2 wt.%) to traditional monomer poly (ethylene oxide) was investigated. Thermogravimetric analysis indicated that poly (ethylene oxide)/poly (vinylidene fluoride) blend had an excellent thermal performance. X-ray diffraction analysis revealed that poly (ethylene oxide)/poly (vinylidene fluoride) blend leads to lower crystallinity and the amorphicity of corresponding gel polymer electrolyte increases with increasing nano-TiO 2 concentration. The maximum ionic conductivity (2.12 × 10 −6 and 6.37 × 10 −6 S/cm) of poly (ethylene oxide)/-(TiO 2 ) 0.5 and poly (ethylene oxide)/poly (vinylidene fluoride)/-(TiO 2 ) 0.5 gel polymer electrolyte at room temperature (25 °C) were obtained, respectively. The prepared poly (ethylene oxide)/poly (vinylidene fluoride)-TiO 2 gel polymer electrolyte demonstrated about 2.6 and 1.8-fold increment in the fracture strength as compared to that of poly (ethylene oxide) gel polymer electrolyte and poly (ethylene oxide)-TiO 2 gel polymer electrolyte. The average transmittance of poly (ethylene oxide)/poly (vinylidene fluoride)-TiO 2 gel polymer electrolyte was about 90 % in the visible region. With good electrical, mechanical and optical performance, it is very suitable for being applied in electrochromic glass. Graphical Abstract
研究领域:
材料科学
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电化学
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RSC Advances
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2016
·Vol. 6
·期 72
·67778-67784
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IF 3.289
Fei Ge,Mengfei Yu,Jun Lin,Cuixia Yu,Wenjian Weng,Kui Cheng,Huiming Wang
Cellular responses are strongly sensitive to surface structure, so the optimization of the structures is essential in biomaterial research. In this work, the exposed nanorod-heights in TiO2 nanorod films were adjusted for enhancing cellular responses. The adjustment was realized by incorporating mesoporous bioactive glass (MBG) into the nanorod films via a sol–gel method. The exposed nanorod-heights in the films could be changed from the original ∼300 nm to ∼200 nm and ∼100 nm. The cellular responses on the nanostructured surfaces were evaluated through culturing mesenchymal stem cells (MSCs). The results showed that the films with shortened nanorod-heights had better cellular responses and could accelerate osteogenic differentiation and mineralization, and the films with 100 nm nanorod-height provided the best surface for cell growth. This is attributed to the nanostructure with the shortened nanorod-heights being well recognized by the cells, consequently the cells grew with a faster osteogenic differentiation through a strengthened BMP-smads signal pathway.
研究领域:
生物材料
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纳米技术
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干细胞生物学
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组织工程
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Energy Sources Part A-Recovery Utilization and Environmental Effects
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2025
·
IF 2.2
Jieming Chen,Yuchun Zhang,Yao Li,Peng Fu,Zhiyu Li
Pure TiO2 exhibits limited responsiveness to visible light, while the doping of Ti3+ significantly enhances its absorption efficiency in the visible spectrum, improving the efficiency of photogenerated electron utilization. However, during the direct reduction of TiO2 using NaBH4, the instability of surface Ti3+ ions and their susceptibility to oxidation in air limit their performance in photocatalytic applications. Nitrogen doping into TiO2 effectively addresses this issue, improving the stability of Ti3+ ions and significantly enhancing visible-light-driven photocatalytic activity. Experimental results indicate that reducing 1 g of TiO2 with 0.2 g of NaBH4, followed by calcination in an ammonia environment at 300℃, yields a catalyst with optimal visible-light photocatalytic hydrogen evolution activity, achieving a hydrogen production rate of 847.8 μmol h−1 g−1, representing a 177-fold enhancement over pristine anatase TiO2. After modification, the band gap of the catalyst decreased from 3.2 eV to 2.83 eV. This study elucidates the synergistic effects among Ti3+ species, nitrogen dopants, and oxygen vacancies in TiO2-based photocatalysts, demonstrating their crucial roles in enhancing visible-light-driven hydrogen evolution.
研究领域:
材料科学
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光催化
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能源化学
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纳米材料
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半导体催化
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环境功能材料
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Xianyu Jiang,Xiang Zhang,Xingjian Zhou,Kai Zheng,Ruoyu Yang,Linbo Zhang
Developing microwave absorbers that simultaneously achieve high absorption efficiency and improved corrosion resistance remains challenging, particularly under corrosive environments containing chloride ions. Herein, we designed a multilayered FI@SiO 2 @TiO 2 composite using flake carbonyl iron (FI) as the core and a sol-gel strategy based on heterointerface engineering. Electrochemical measurements reveal that the corrosion rate of FI@SiO 2 @TiO 2 is nearly two orders of magnitude lower than that of pristine FI, reaching as low as 0.012 mm/year. This enhanced corrosion resistance mainly arises from the dense and chemically inert SiO 2 @TiO 2 dual-shell structure, which effectively suppresses the diffusion of corrosive species and inhibits electrochemical reactions at the metal surface. Electromagnetic characterization shows that FI@SiO 2 @TiO 2 achieves a minimum reflection loss (RL min ) of −65.01 dB at 4.18 GHz with a thickness of 2.23 mm, along with a maximum effective absorption bandwidth (EAB) of 4.53 GHz at only 1.36 mm. Such excellent performance predominantly originates from engineered heterogeneous interfaces, which induce abundant interfacial and dipolar polarization and markedly improve impedance matching of the flake iron core. Furthermore, electromagnetic simulations based on COMSOL and CST corroborate the positive role of the dual-shell architecture in optimizing impedance matching and reducing radar reflection. This work offers a practical strategy for fabricating dual-functional microwave absorbers capable of delivering high absorption efficiency together with sustained corrosion resistance.
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Materials Research Express
·
2018
·Vol. 5
·期 2
·025034
·
IF 1.151
Jinsong Hu,Xinhua Huang,Nuoya Wang,Lei Zhang
A new molecule 3-[2-(7-oxa-bicyclo[4.1.0]hept-3-yl)-ethylsulfanyl]-propane-1,2-diol (CESPO) was synthesized by click reactions. The molecule has hydroxyl and thioether groups which could thus chelate with active cations. Through a sol-gel process, we thus fabricated porous nano-TiO2 in the presence of CESPO. The prepared TiO2 having high specific surface area and was composed of nanocrystals which are favorable for effective charge transport as photocatalyst carrier. On the other hand, Ag nanoparticles were loaded on TiO2 composites that could be utilized as photocatalyst for degradation of RhB. The experimental results exhibit plasmon enhanced photocatalytic activity depending on the loading amount of the AgNPs. This work provides a facile method to prepare porous oxides that could be adapted for catalyst carriers.
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JOURNAL OF CLUSTER SCIENCE
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2026
·Vol. 37
·期 6
·139
·
IF 4.1
Chen Hechang,Wu Fei,Zhu Yufu
Titanium microspheres served a dual role in this study. First, they acted as supporting materials for TiO 2 /BiOBr photocatalysts. Second, they provided a low-cost precursor for titanium dioxide preparation. The growth of core-shell structured Ti@TiO 2 microspheres was realized using a hydrothermal method in NaOH solution. By varying the concentration of NaOH solution, TiO 2 nanowires with different morphologies were fabricated. A comprehensive characterization of the samples using field-emission scanning electron microscopy, X-ray diffraction measurements, and energy-dispersive X-ray analysis revealed that TiO 2 nanostructures formed a well-coated layer on titanium microspheres, demonstrating an anatase crystal structure. The photocatalytic performance of the obtained core-shell structured Ti@TiO 2 microspheres was studied through the photocatalytic degradation of Rhodamine B (RhB) solution. The results demonstrated that the sample prepared in NaOH solution with the concentration of 7 M exhibited the best photocatalytic performance, achieving an RhB removal efficiency of nearly 100% within 100 min under simulated light irradiation. In order to further improve the photocatalytic performance of the prepared samples, BiOBr was loaded on the surface of TiO 2 nanowires via a solvothermal method, yielding core-shell structured Ti@TiO 2 /BiOBr heterojunction photocatalysts, consisting of a metallic Ti core and a composite TiO₂/BiOBr shell. The catalysts demonstrated a significant enhancement in photocatalytic performance compared with core-shell structured Ti@TiO 2 microspheres, achieving nearly complete degradation of RhB solutions within 30 min. Furthermore, the photocatalyst maintained 91.92% of its activity after three consecutive cycles.
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INORGANIC CHEMISTRY
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2026
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IF 4.6
Linkai Zhao,Jing Zhao,Jiaying Hu,Zhao Mo,Ziyi Wang,Zhaoli Xue,Lei Feng,Long Zhao
A typical dye-sensitized semiconductor system prefers a cascade electron transfer to gain efficient injection and to avoid charge recombination, whereas this design protocol might be an unfit photocatalysis domain since the radical species are no longer bare photoelectrons. To check the hypothesis, a zinc porphyrin sensitizer with the triphenyltriazine (TPTZ) substituent 3TPTZ-ZnP was designed, along with a triphenylamine (TPA) analogue 3TPA-ZnP for comparison. Density functional theory (DFT) calculations suggested that the TPTZ substituents on 3TPTZ-ZnP form a more planar structure with no significant coupling to the porphyrin core. When coated onto TiO2, enhanced light absorption was achieved by 3TPTZ-ZnP. This increased light-harvesting ability did not lead to a greater photocurrent of 3TPTZ-ZnP/TiO2 as compared to 3TPA-ZnP/TiO2, which is due to a competitive electron transfer pathway from the porphyrin to the TPTZ groups, besides the electron injection to TiO2. Nonetheless, 3TPTZ-ZnP/TiO2 exhibited superior photodegradation performance compared to 3TPA-ZnP/TiO2. This is attributed to the planar conjugated structure with more nitrogen content of TPTZ, which promotes π–π interactions with aromatic dyes and allows more superoxide radicals (•O2–) to be generated on the surface. Further experiments also confirmed that the main free radicals in the reaction were photogenerated holes (h+) and •O2–.
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ACS Applied Materials & Interfaces
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2026
·
IF 8.2
Weixue Wang,Xin Cao,Zikai Feng,Jianfei Cao,Meijun Liu,Bolin Wang,Haifeng Zhang,Chenshuai Yan
Technetium-99 (99Tc) predominately exists in the form of oxygenated anions (99TcO4–) under oxic conditions, which are highly soluble and non/weakly complexing; converting it to a sparingly soluble 99TcO2·nH2O precipitate for further disposal is a well-established tactic. Oxygen vacancy (OV) engineering paves a shortcut for modulating the kinetics, energetics, and mechanisms of photocatalytic reduction synergistically. However, the mechanism that OVs contribute to the photocatalytic reduction of 99TcO4– remains unclear. Herein, OV-enriched ultrathin two-dimensional TiO2 is fabricated via the solvent-free confined synthesis strategy. Based on the characterization analysis with experiments and density functional theory, it is demonstrated that the apparent elevated ReO4– (a nonradioactive surrogate for 99TcO4–) conversion efficiency is directly dependent on the content of OVs, which allows for the rapid photocatalytic reduction of Re(VII). Significantly, under simulated sunlight irradiation at pH = 2, 2D TiO2-500 °C reduced to 97.0% Re(VII) (20 mg/L) within 180 min. A reducing radical (·CO2–)-mediated pathway was proposed to account for the high-efficiency reduction of Re(VII) to Re(IV). During Re(VII) photoreduction, OVs can not only promote the adsorption of reactants but also effectively reduce the conversion barrier for the reducing radicals (·CO2–), providing a convenient channel for the rapid reduction of Re(VII). This study reveals the mechanism of OVs during the photoreductive transformation of Tc(VII)/Re(VII) comprehensively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.6
Chao Peng,Tianyu Li,Shitao Liao,Jiaqi Chen,Yun Xue,Yongde Yan,Fuqiu Ma,Guoxin Tian
Direct electrochemical reduction of soluble U(VI) to relatively insoluble U(IV) presents a simple yet highly efficient approach for treating uranium-containing wastewater. However, the remediation of radioactive wastewater co-contaminated with uranium and organic compounds remains a significant challenge. In this work, both anatase and rutile phases TiO 2 nanotube arrays (A/R-TiO 2 NTAs) electrodes were fabricated through anodizing and annealing of a Ti plate, enabling efficient electroreductive removal of U(VI) from both simulated and real uranium-organic co-existing wastewater. Compared to the Ti electrode, the TiO 2 NTAs electrodes exhibited a lower U(VI) reduction potential, a larger electrochemical active surface area (ECSA), and a smaller charge transfer resistance (R ct ). Consequently, the TiO 2 NTAs electrode demonstrated exceptional U(VI) removal performance, achieving reduction efficiencies of 96.05 ± 1.24% (A-TiO 2 NTAs) and 93.07 ± 1.45% (R-TiO 2 NTAs) after 10 h of electrochemical treatment. The TiO 2 NTAs electrodes demonstrated exceptional stability, maintaining average U(VI) removal and recovery efficiencies above 90% over eight consecutive removal-recovery cycles. Moreover, the electrodes exhibited strong anti-interference capability against co-existing organic compounds, except for urea. Even in real uranium-laden wastewater containing high concentrations of organic contaminants—such as tetrahydrofurfuryl alcohol (THFA), polyvinyl alcohol (PVA), and urea—the TiO 2 NTAs electrodes achieved remarkable U(VI) removal efficiencies of 96.38 ± 1.43% (A-TiO 2 NTAs) and 94.56 ± 0.97% (R-TiO 2 NTAs) after only 2 h. Systematic mechanistic investigation revealed that the electroreductive removal of U(VI) is a multi-step process, primarily involving three key stages: adsorption, reduction and transformation, ultimately immobilizing uranium as UO 2 on the electrode surface. This work conclusively demonstrates that direct electrochemical reduction is a highly efficient strategy for treating complex uranium-organic co-existing wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Shibo Yu,Jiaofan Sun,Jiayan Liu,Mengna Zhan,Wentai He,Yiqing Zeng,Zhaoxiang Zhong,Weihong Xing
Inorganic hierarchical porous fibrous membranes demonstrate significant superiority in filtration, adsorption, and catalysis, while the inherent brittleness of inorganic materials and the mechanical fragility from porous structures pose a critical bottleneck to their durability. To overcome this limitation, halloysite nanotubes (HNTs) were integrated into the porous fibers, acting as “nano-rebars” to construct a robust skeleton. This structure facilitated efficient stress transfer and dissipation, significantly enhancing the mechanical robustness of the membrane and increasing the tensile strength to more than twofold. Leveraging the natural electret effect of HNTs, the fiber membrane achieved an exceptional filtration efficiency of 99.85% for the most penetrating PM 0.3 through additional electrostatic adsorption effects. Furthermore, the HNTs-optimized hierarchical pore structure resulted in a remarkably low filtration resistance of 55.2 Pa, while the filtration quality factor could reach up to 0.118 Pa −1 . Additionally, the fiber membrane exhibited remarkable photocatalytic efficacy for formaldehyde (HCHO) degradation, attaining a removal rate of 82.77% within an exceptionally short residence time of merely 0.18 s. This study elucidates the structure-property relationship in inorganic fiber membranes and provides a promising strategy for developing robust, multifunctional air purification materials capable of withstanding harsh conditions.
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International Journal of Nanomedicine
·
2026
·
IF 8.7
Sinian Zheng,Cong Li,Jiayu Chen,Kuo Zhang,Xiaobo Cui,Rubing Li,Zeming Weng
Introduction Renal cell carcinoma (RCC) is a common urinary malignancy with high postoperative recurrence, and current therapies are limited by toxicity or insufficient efficacy. Efficient sonodynamic therapy (SDT) strategies capable of generating reactive oxygen species (ROS) are urgently needed. This study aimed to develop a high-performance MOF-based heterojunction sonosensitizer to enhance ROS generation and achieve effective anti-tumor activity.Methods We synthesized HKUST-1@TiO2 heterojunctions and characterized their morphology, electronic structure, and ROS generation capacity. In vitro, OSRC-2 cells were treated with HKUST-1@TiO2 ± ultrasound; cell viability, proliferation, apoptosis, and intracellular ROS were assessed. In vivo, nude mice bearing OSRC-2 xenografts received HKUST-1@TiO2 ± ultrasound; tumor growth, histopathology, and biosafety markers were analyzed.Results HKUST-1@TiO2 exhibited efficient heterojunction formation, which enhanced charge separation and ROS production under ultrasound. In vitro, the combination treatment significantly reduced cell viability, decreased Ki67-positive area, and increased the number of TUNEL-positive cells. Intracellular ROS staining confirmed effective ROS accumulation in tumor cells. In vivo, tumor volume and weight were significantly reduced, with no detectable organ toxicity.Conclusion HKUST-1@TiO2 heterojunctions effectively augment SDT through enhanced intracellular ROS generation, inducing tumor cell apoptosis and inhibiting proliferation. This study addresses the unmet need for efficient and safe SDT for RCC and provides a promising strategy with translational potential.
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