CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Nuoxin Xu,Xingrong Xiao,Hui Yang,Enjie Yu,Qilong Zhang
In this study, TiO 2 nanowires with various aspect ratios were prepared via a precursor-controlled hydrothermal process. Ternary composite films comprised of P(VDF-HFP) polymer, Ag particles and the as-synthesized TiO 2 nanowires were then fabricated. The results reveal that TiO 2 NWs with high aspect ratios (i.e., pa-TiO 2 ) exhibit superiority in enhancing the dielectric constants of composites in comparison with their low-aspect-ratio counterparts (i.e., pr-TiO 2 ). For instance, the dielectric constant of the Ag/pa-TiO 2 /P(VDF-HFP) composite with 30 vol% TiO 2 NWs reaches 33.4 at 100 Hz, which is 42.1% larger than that of Ag/pr-TiO 2 /P(VDF-HFP) sample and 227% higher than pristine P(VDF-HFP). In addition, TiO 2 nanowires also serve as physical obstacles to avoid aggregation of Ag particles. As a consequence, the ternary composites filled with high-aspect-ratio TiO 2 NWs exhibit suppressed dielectric losses (e.g., 0.023 at 100 Hz) and low conductivities, making them promising candidates for applications in integrated capacitors and energy storage devices.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 9
·3380-3386
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IF 3.269
Nannan Liu,Sihong Chen,Yilin Li,Hong Dai,Yanyu Lin
The photoelectrochemical performance of rutile TiO2 mesocrystals has been demonstrated to be significantly improved by a chelating-assembly of poly-dopamine on the surface of the TiO2 mesocrystals. The formed benzoquinone groups on poly-dopamine could act as electron receivers to take over the photo-induced electrons of TiO2 mesocrystals, thereby constituting a self-reinforced functionality transducing interface to enhance the cathode photocurrent. Herein, zearalenone as a representative mycotoxin was used as a model analyte to assist the immunoassay establishment. The bioconjugates of secondary antibody integrated ordered mesoporous Co3O4 were introduced through immunoreaction. The Co3O4, as a powerful scaffold, could load more bioactive molecules due to its mesoporous structure. Owing to the inevitable steric hindrance caused by the bioconjugates, the photo-initiated electrons in the TiO2 mesocrystals/poly-dopamine composite were inaccessible to reduce the oxygen in the electrolyte, thus depressing the photocurrent density. Meanwhile, partial exciting light found it difficult to arrive at the TiO2 mesocrystals due to Co3O4 with a felicitous band gap of 2.07 eV which consumed the partial light energy. Under optimal conditions, this immunosensor had a wide linear range from 10−6 to 20 ng mL−1 for zearalenone detection. The specificity, precision, and reproducibility were satisfactory for this biosensor, which offered a valuable and versatile protocol in photoelectrochemical immunoassay development.
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RSC Advances
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2016
·Vol. 6
·期 99
·96768-96777
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IF 3.289
Yuhao Chu,Yuenan Chen,Nanjun Chen,Fanghui Wang,Hong Zhu
Recently a new method for increasing the ion conductivity of anion exchange membranes (AEM) was developed based on the novel materials ionic liquids (ILs). We mixed the ILs into the membrane directly instead of immobilizing onto the polymer backbone as in the traditional way. Nano-TiO2 was introduced to stabilize the ILs in the membrane. The ILs were immobilized by the nano-TiO2, acting as the “active sites” in the membrane, to enhance the mobility of the hydroxyl groups so as to increase the ion conductivity. Both pure ILs composite membranes and ILs–TiO2 composite membranes were synthesized, and their properties were compared. 1H nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy were used to analyze the structures of the composite membranes. The mechanical properties, thermal stabilities, ion conductivities, water uptakes, swelling ratios, and ion exchange capacities of the membranes were investigated. The interaction between the TiO2 and ionic liquids was confirmed by X-ray diffraction. The stability of the ILs in the membrane was measured comprehensively. All these results show that this novel method is effective and promising for AEM applications.
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CHEMOSPHERE
·
2016
·
IF 3.698
Qingxiang Zhou,An Xing,Danchen Zhao,Kuifu Zhao
Tetrabromobisphenol A, one of the most important brominated retardants , is an typical persistent organic pollutant and it is of great value to develop rapid and effective degradation method. Present study established a photoelectrodegradation method with CeO 2 and reduced graphene oxide co-modified TiO 2 nanotube arrays (RGO-CeO 2 -TiO 2 NAs), which were successfully synthesized and characterized with scanning electron microscopy (SEM) and Energy Dispersive X Ray Spectrometry (EDX). The SEM Images revealed that the nanotubes had a diameter of about 100 nm and an obvious layer of CeO 2 and RGO on the surface of TiO 2 nanotube arrays. The EDX data exhibited the presence of Ce element. The results demonstrated that TBBPA was degraded at a high degradation rate constant of 0.0191 min −1 , and photogenerated holes played a major role in the degradation reaction. Significant decrease of degradation efficiency was achieved with the presence of EDTA-2Na(hole scavenger), yet while the existence of t-BuOH(OH scavenger) resulted in less inhibition on the degradation. Besides, RGO-CeO 2 -TiO 2 NAs exhibited good stability with rarely decline of degradation efficiency for ten reused runs. All these indicated that RGO-CeO 2 -TiO 2 NAs were a good catalyst with extraordinary catalytic activity and stability for PEC degradation, and would have great potential in the control and removal of pollutants.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
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2017
·
IF 1.277
Dan Chen,Xiaoping Zou,Hong Yang,Ningning Zhang,Wenbin Jin,Xiao Bai,Ying Yang
The morphology of compact TiO2 film used as an electron-selective layer and perovskite film used as a light absorption layer in planar perovskite solar cells has a significant influence on the photovoltaic performance of the devices. In this paper, the spin coating speed of the compact TiO2 is investigated in order to get a high-quality film and the compact TiO2 film exhibits pinhole- and crack-free films treated by 2000 rpm for 60 s. Furthermore, the effect of annealing process, including annealing temperature and annealing program, on CH3NH3PbI3-XClX film morphology is studied. At the optimal annealing temperature of 100°C, the CH3NH3PbI3-XClX morphology fabricated by multistep slow annealing method has smaller grain boundaries and holes than that prepared by one-step direct annealing method, which results in the reduction of grain boundary recombination and the increase of Voc. With all optimal procedures, a planar fluorine-doped tin oxide (FTO) substrate/compact TiO2/CH3NH3PbI3-XClX/Spiro-MeOTAD/Au cell is prepared for an active area of 0.1 cm2. It has achieved a power conversion efficiency (PCE) of 14.64%, which is 80.3% higher than the reference cell (8.12% PCE) without optimal perovskite layer. We anticipate that the annealing process with optimal compact TiO2 layer would possibly become a promising method for future industrialization of planar perovskite solar cells.
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Nanoscale
·
2017
·Vol. 9
·期 28
·9913-9920
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IF 7.367
Javid Khan,Jiuwang Gu,Shiman He,Xiaohui Li,Gulzar Ahmed,Zhongwu Liu,Muhammad Nadeem Akhtar,Wenjie Mai,Mingmei Wu
A tri-layered photoelectrode for dye-sensitized solar cells (DSSCs) is assembled using single crystal hollow TiO2 nanoparticles (HTNPs), sub-micro hollow TiO2 mesospheres (SHTMSs) and hierarchical TiO2 microspheres (HTMSs). The bottom layer composed of single crystal hollow TiO2 nanoparticles serves to absorb dye molecules, harvest light due to its hollow structure and keep a better mechanical contact with FTO conducting glass; the middle layer consisting of sub-micro hollow mesospheres works as a multifunctional layer due to its high dye adsorption ability, strong light trapping and scattering ability and slow recombination rates; and the top layer consisting of hierarchical microspheres enhances light scattering. The DSSCs made of photoanodes with a tripartite-layer structure (Film 4) show a superior photoconversion efficiency (PCE) of 9.24%, which is 7.4% higher than a single layered photoanode composed of HTNPs (Film 1: 8.90%), 4.6% higher than a double layer-based electrode consisting of HTNPs and SHTMSs (Film 2: 9.03%) and 2.6% higher than a double layer-based electrode made of HTNPs and HTMSs (Film 3: 9.11%). The significant improvements in the PCE for tri-layered TiO2 photoanodes are mainly because of the combined effects of their higher light scattering ability, long electron lifetime, fast electron transport rate, efficient charge collection and a considerable surface area with high dye-loading capability. This study confirms that the facile tri-layered photoanode is an interesting structure for high-efficiency DSSCs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ao Zhang,Yan Zhang,Weihua Cheng,Xinran Li,Kai Chen,Fangjie Li,Dongye Yang
This study presents a novel strategy for the rapid detection of hydrogen and ammonia gases through the synthesis of a composite material that integrates SnO 2 and TiO 2 into an n-n heterostructure on the surface of two-dimensional layered Ti 3 C 2 Tx MXene. The incorporation of Pd nanoparticles significantly enhances the sensor's adsorption and sensing capabilities, particularly for hydrogen. The resulting dual-gas sensor demonstrates a pronounced linear response to hydrogen with a low detection limit of 200 ppb, along with rapid response times, excellent repeatability and long-term stability. Leveraging MXene's superior ammonia adsorption properties, the sensor also exhibits commendable linearity and robustness in detecting ammonia, with strong resistance to humidity-induced interference. To further improve the sensor's performance, machine learning techniques such as support vector machine (SVM) and artificial neural network (ANN) are incorporated, substantially enhancing the sensor's selectivity and sensitivity of the detection. These advancement enables the precise identification and quantification of complex gas mixtures containing hydrogen and ammonia. The sensor’s meticulously designed circuitry operates in real-time sensing mode, ensuring accurate differentiation between the two gases. This research establishes a robust foundation for the development of advanced gas sensing technology, showcasing its potential for multi-gas detection and analysis across diverse industrial and environmental applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Man Liu,Tong Song,Xuan Wu,Qian Li,Shiwei Wang
In this paper, the foamed polylactic acid (PLA) composites with different ratios of titanium dioxide (TiO 2 ) and lignin (Lg) are prepared. Molecular dynamics simulation analysis indicates that the fillers enhance the mechanical properties of the composites. The optimal foaming temperatures for PLA/Lg and PLA/TiO 2 composites are found to be 110 and 100°C, respectively. The supercritical carbon dioxide foaming process is applied to get the foamed composites, and their mechanical and thermal properties are analyzed. The results show that the addition of TiO 2 improves the melting point and compression properties of the PLA composites. Furthermore, the inclusion of Lg increases the molecular chain mobility, foaming multiplicity, and compression strength of the composite materials.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 11
·1-12
·
IF 2.8
Yang Zaizhi,Wang Xi,Zhang Liang,Li Hailing,Zhang Hui,Xu Dong
Flash sintering is considered a promising energy-saving and efficient technology for preparing high-temperature ceramics. The effects of limited current on flash sintering parameters, microstructure, and electrical properties of (La 1/2 , Ta 1/2 ) 0.02 Ti 0.98 O 2 ceramic were investigated by the XRD, SEM, XPS, and precision impedance analyzer. With limiting current increase, the grain size of flash sintering sample increases gradually, and the relative density increases first and then decreases. The average grain size is about 1 μm, and the highest relative density is 96.9%. Joule heating runaway and oxygen vacancy defect lead to rapid densification of flash sintering La and Ta co-doped TiO 2 ceramics. According to the EPDD model, doped La 3+ and Ta 5+ ions increase the concentration of oxygen vacancies and free electrons, lead to local polarization of carriers, and obtain a giant dielectric constant of ε ’ = 7.6 × 10 4 and low dielectric loss of tanδ = 0.11. At high temperature, electrons break free from the constraints of defect clusters and accumulate at the interface, leading to interface polarization due to the IBLC model. The giant dielectric properties originate from the combined effect of EPDD and IBLC model.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Ziang Min,Qing Tian,Zhuanzhuan Shi,Xiangyu Ding,Chunxian Guo,Chang Ming Li,Xiaoshuai Wu
Microbial Fuel Cells (MFCs) have garnered significant research attention as promising candidates for efficient and eco-friendly energy storage solutions. However, the persistent obstacle of limited electron transfer efficiency continues to hinder their widespread adoption. This study innovatively tackles the challenge of low electron transfer efficiency in MFCs by copolymerizing a conjugated polymer (PDA) with a photocatalytic material (TiO 2 ) onto Shewanella putrefaciens CN32 to create a hybrid microorganism. These hybrids, particularly when utilized as catalysts within MFCs under light illumination, significantly boosted electron transfer rates. Remarkably, the hybrid microorganism demonstrated an impressive current density of 1.07 mA/cm 2 in darkness, which soared to 5.657 mA/cm 2 under illumination. This microorganism exemplifies the synergistic interplay between the PDA and TiO 2 , where the PDA serves as an electron accumulator, while TiO 2 converts photons into valuable energy, ultimately enhancing the overall electrochemical performance of the MFCs. This work not only underscores the potential of integrating conjugated polymers and photocatalytic technology within bioelectrochemical systems but also expands the avenues for the development of more efficient and sustainable MFCs.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
·
IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Jun Zhang,Tiantian Peng,Lanyu Luo,Weimin Wu,Xinlan Xu,Boyu Liu,Lingying Jiang,Shi-Yu Lu,Meng Jin
Maximizing reaction kinetics of Pd catalysts for oxygen reduction reaction (ORR) while minimizing CO poisoning during methanol oxidation reaction (MOR) remains a key challenge for advancing direct methanol fuel cells (DMFCs). Herein, we synthesize an anatase/rutile TiO2 homojunction (A/R-TiO₂) through energy band alignment and oxygen vacancies engineering, providing support for Pd nanoparticles to decipher the strong correlation between this unique structure and the electrocatalytic properties of Pd/A/R-TiO₂ catalysts. Combined experimental results and theoretical calculations demonstrate that the near perfect energy band alignment and abundant oxygen vacancies in A/R-TiO₂ not only accelerate electron transfer to Pd surface, thereby maximizing reaction kinetics and catalytic efficiency, while optimize the electronic structure of Pd active sites to reduce adsorption energy of key intermediates (*OH, *CH2OH, *CO) during ORR and MOR. Consequently, the Pd/A/R-TiO₂ catalyst delivers remarkably positive E1/2 of 0.929 V and enhanced mass activity of 4.27 A mgPd-1 at 0.85 V for ORR, respectively nearly 13 and 27 times greater than those of Pt/C and Pd/C catalysts commercially available at present. The Pd/A/R-TiO₂ catalyst displays high selectivity for an effective four-electron transfer pathway, a lower H2O2 yield (1.66%), and excellent methanol crossover tolerance. Importantly, the catalyst demonstrates exceptional stability, exhibiting minimal activity decay and negligible structural degradation after 10000 cycles. Furthermore, the as-synthesized catalyst achieves superior MOR activity (4.10 A mg-1 and 8.85 A cm-2) and enhanced CO tolerance, surpassing commercial Pt/C and Pd/C catalysts. These bifunctional catalysts thus hold strong potential for large-scale and industry-orientated use of DMFCs.
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