ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Lixin Song,Xin Yin,Xueyao Xie,Pingfan Du,Jie Xiong,Frank Ko
In this study, highly flexible TiO 2 /C nanofibrous film was fabricated via electrospinning followed by thermostabilization and carbonizaiton. These nanofibers (NFs) composed of carbon and TiO 2 nanoparticles (NPs) with incorporation of TiO 2 NPs into carbon matrix. The content of polyvinylpyrrolidone (PVP) and titanium (IV) isopropoxide (TiP) were adjusted to optimize the performance of the TiO 2 /C nanofibrous film. The results show that the average diameter of TiO 2 /C NFs and the content of carbon in NFs decreased as the proportion of PVP increased. With addition of PVP, TiO 2 NPs distributed more uniformly. With increase of TiP, the average diameter and content of TiO 2 increased. As a result, the conductivity decreased with the increase of PVP and TiP. While, the flexibility increased, reaching a best value before decreasing as the PVP and TiP increased. The TiO 2 /C nanofibrous film presented best flexibility with the content of PVP and TiP of 50% and 0.7 g. Notably, the flexible TiO 2 /C nanofibrous film showed pleasurable catalytic activity. Therefore, the TiO 2 /C nanofibrous film served as platinum (Pt)- and transparent conducting oxide (TCO)-free counter electrode (CE) for flexible dye-sensitized solar cells (FDSSCs). Besides, the TiO 2 /C nanofibrous film CE withstood large deformation of bending and exhibited excellent bending stability.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2022
·
IF 9.879
Muhammad Awais,Xiangrong Chen,Zelin Hong,Qilong Wang,Yiwen Shi,Fan-Bo Meng,Chao Dai,Ashish Paramane
Epoxy (EP) resin insulations are widely used in electronic devices and power systems . They are gradually finding their way as winding insulation material for medium frequency transformers (MFT) due to their attractive insulating and adhesive properties along with low cost and easy processing. However, their dielectric insulation properties are compromised at high frequencies and high temperatures due to poor thermal properties. In this context, the surface-treated hexagonal boron nitride (h-BN) micro fillers and core-shell TiO 2 @SiO 2 nanofillers are doped in epoxy (EP) to enhance their thermal and electrical insulation properties under high frequencies and high temperatures. Results reveal that the thermal conductivity of the EP increases continually, whereas the electrical breakdown strength is reduced above the threshold content of micro/nano fillers. Particularly, the micro h-BN addition is beneficial for thermal conductivity enhancement, whereas the core-shell structure of TiO 2 @SiO 2 improves the electrical insulation properties of the EP. The multi-layer core model is used to explain the dynamics of the fillers. The homogeneous dispersion and optimal content of suitable micro-nano fillers can produce efficient EP composites as the electrical insulation for medium frequency transformers.
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
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IF 6.6
Mengqin Zhou,Xiu Wan,Xia Zhang,Xiaoxuan Wang,Shixiong Hao,Lei Li,Chunru Cheng,Jian Peng,Yongfan Wang
Green synthesis of OV-rich TiO 2- x using L-cysteine, avoiding hazardous H 2 /NaBH 4. • Construction of hollow BiOI/ TiO 2- x S-scheme heterojunction via in-situ assembly. • Hollow structure, OVs, and S-scheme synergistically boost light harvesting & charge separation. • 94.24% TC removal in 120 min; kinetic constant 3.83–7.97 times higher than controls. • •O 2 − and h + as dominant active species; S-scheme mechanism confirmed. Addressing the challenge of tetracycline (TC) contamination in aquatic environments, this work reports a high‑performance S‑scheme photocatalyst fabricated via a green and sustainable strategy. Oxygen vacancy (OV)‑rich TiO 2- x hollow microspheres were prepared by a hard‑template method using L‑cysteine as a green reductant, followed by in‑situ hydrothermal deposition of BiOI nanosheets. The optimized BiOI/TiO 2- x -5% composite exhibits 94.24% TC degradation within 120 min under visible light, with a reaction rate constant 3.83, 3.67, and 7.97 times higher than those of pristine TiO 2 , TiO 2- x , and BiOI, respectively. The boosted performance stems from the synergistic effects of the hollow structure, which enhances light harvesting and mass transfer, and the OV‑mediated S‑scheme heterojunction, which greatly suppresses charge recombination while retaining strong redox potentials. Mechanistic investigations confirm •O 2 − and h + as the dominant active species. This work provides a promising paradigm for designing efficient defect‑mediated hollow heterojunctions toward sustainable antibiotic wastewater remediation. Download: Download high-res image (164KB) Download: Download full-size image
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122586
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IF 7.5
Wenyuan Yan,Qiwen Zhou,Lele Zhan,Qinghua Liu,Jinquan Xu,Sheng Liu
A flow injection photoelectrochemical (FI-PEC) system for the rapid, sensitive, and continuous detection of copper ions (Cu 2 + ) in aqueous solutions was developed. The PEC system integrates a custom-designed 3D-printed thin-layer flow cell (volume of 390 µL), enabling efficient mass transfer. The PEC sensor is based on a g-C 3 N 4 /TiO 2 heterojunction photoanode, which was synthesized in situ on a fluorine-doped tin oxide (FTO) substrate via hydrothermal and calcination processes. The obtained g-C 3 N 4 /TiO 2 composite has a flower-like array structure and exhibits enhanced photo response under illumination, with a photocurrent density of 0.34 mA/cm 2 . The g-C 3 N 4 /TiO 2 PEC sensor can be efficiently regenerated using EDTA, allowing for multiple detection cycles without significant performance degradation. The system demonstrates a wide linear detection range of 0.1–150 µM, a low detection limit of 0.043 µM, excellent selectivity against common interfering ions, and maintains good stability after 10 h of continuous operation. These results indicate that the FI-PEC system based on the g-C 3 N 4 /TiO 2 heterojunction photoanode has practical application prospects in monitoring copper pollution in natural environments.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Peng Liu,Qiang Ru,Zhen Wang,Bei Wang,Qing Guo,Peng Zhang,Xianhua Hou,Shichen Su,Francis Chi-Chung Ling
The 1D bundle-like NiCo 2 O 4 @TiO 2 hybrid was synthesized by a general and effective microemulsion strategy. It is found that after cycles the primitive 1D shape has been translated into broccoli-like fashion accompanied with abundant pores, enough active sites and convenient diffusion path, which endows the hybrid with high lithium storage capability and excellent cyclability. As anodes for LIBs, a reversible discharge capacity of 749.74 mA h g −1 is achieved after 800 long-term cycles at a current density of 2000 mA g −1 compared to 447.35 mAh g −1 of pure NiCo 2 O 4 . The hybrid also delivers superior rate performance such as 561.09 mAh g −1 even at a large current density of 5000 mA g −1 . Specifically, when the current density gradually returns to 2000 mA g −1 , the capacity still recovers to 696.69 mAh g −1 .
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高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Lei Zhao,Baoyue Zhang,Xin Xiao,Feng Long Gu,Rui-Qin Zhang
Active species such as holes, electrons, hydroxyl radicals ( OH), and superoxide radical anions ( O 2 − ) involved in the photocatalytic oxidation of benzyl alcohol (BA) into benzaldehyde (BAD) on TiO 2 under ultraviolet (UV) light were investigated by adding corresponding scavengers. The experimental results show that the oxidation of BA into BAD is driven mainly by the holes and OH radical. The role of dissolved O 2 was studied by bubbling N 2 through the reaction. The results show that the dissolved O 2 is, to some extent, the source of OH. Additional density functional theory (DFT) calculations identified two H-abstraction pathways ( R abs OH and R abs α). The structure of the R abs OH product is less stable and tends to transfer resulting in the R abs α product. The holes are the main driving force for the abstracting of H from BA. The OH radical combines with the H-abstract product to form a precursor of product BAD, detected by LC–MS technique ( m / z 123), which then undergoes an intramolecular dehydration reaction to form BAD. The results will help to select the optimal active species for the photocatalytic oxidation of BA into BAD on TiO 2 under UV light.
研究领域:
物理化学
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光催化
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环境化学
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材料化学
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理论计算化学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Xiaoyun Chen,Dong-Hau Kuo,Dongfang Lu
Yellow-colored N-doped mesoporous TiO 2 photocatalyst (TiO 2 -NT) with visible-light response was prepared by a hydrolysis–precipitation method at different urea contents with the use of nanocrystalline cellulose (NCC) as template. The photocatalytic activity was investigated through the degradation of phenol, nitrobenzene, and methyl orange (MO) under artificial visible and sun light irradiation. X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse spectroscopy (DRS), X-ray diffraction (XRD), thermogravimetry–differential thermal analysis (TG/DSC), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and N 2 adsorption–desorption isotherms were used for catalyst characterization. The results showed that NCC-templated TiO 2 with a suitable N-doping content (TiO 2 -NT) exhibited higher activity under visible and sun light irradiation than N-doped TiO 2 synthesized without NCC template (TiO 2 -N). Affected by the hydroxyl groups of NCC macromolecule and the Ti precursor, the growth and aggregation of TiO 2 precursor before calcination were inhibited. The NCC template led to high dispersion, small grain size, and high specific surface area of TiO 2 -NT. Nitrogen doping was proposed to adjust band gap and electrical properties of TiO 2 by establishing acceptor defect. N-doped TiO 2 with the intrinsic donor defect of oxygen vacancy and the nitrogen-to-oxygen acceptor defect could be excited by visible irradiation for efficient pollutant degradation.
研究领域:
材料科学
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环境催化
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纳米技术
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光催化
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可再生材料
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高影响因子
Molecular Catalysis
·
2023
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IF 4.6
Jia Li,Jianfeng Zheng,Xingmin Liu,Zhanggen Huang
Metal additives can greatly improve the catalytic oxidation of photocatalysts for degrading volatile organic compounds (VOCs) including formaldehyde. Different type metal, including Pd, Cu and Na, were doped in TiO 2 (B) nanosheets with oxygen vacancy, and the degradation rate of HCHO were evaluated using the above catalysts. A series of theoretical and experimental studies on these modified TiO 2 (B) photocatalysts were carried out. The presence of O v leads to the appearance of impurity levels under the conduction band of TiO 2 (B), which could enhance the absorption in the visible spectral range by reducing the band gap and inhibiting the recombination of photo-induced charges. TiO 2 (B) with oxygen vacancies and doped with Na is used as a photocatalyst for degrading HCHO, and the removal rate up to 80% within 50 min. It is quite important to match the bandgap structure of photocatalysts and redox potential of O 2 /•O 2 − . Doping of excessive metals is detrimental to the separation and transfer of photogenerated charges. The intermediates and mechanism of photocatalytic oxidation of HCHO were investigated by in situ DRIFTS.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
JiuWu Wang,Caini Yang,Siyao Chen,Yinping Wu,Xian Sun,Chenguang Huang,Rui Tang,Jiasheng Ke,Yi Dai,Yue Situ,Hong Huang
High-performance sodium-ion batteries (SIBs) are highly expected in the field of large-scale static energy storage due to the low expenditure and abundant sodium resource. However, the sodium storage performance of anode materials for SIBs has suffered from the foot-dragging reaction kinetics arising from large-size Na + during intercalation/deintercalation, which imposes more stringent requirements on the morphology and structure of the potential anode electrodes. Herein, we successfully designed and synthesized a three-dimensional (3D) heterojunction as anode material for SIBs, which assembled by interlayer-expanded MoSe 2 nanosheets perpendicularly anchored on the nitrogen-doped branched TiO 2 @C nanofibers (MoSe 2 @NBT@CNFs). Not only does the branched TiO 2 @C nanofibers suppress the severe self-aggregation of MoSe 2 nanosheets but also buffer the volume expansion during the cycling process. Moreover, an expanded interlamellar distance of MoSe 2 nanosheets accelerate sodium ion diffusion, and strong chemical interactions between MoSe 2 nanosheets and carbon nanofibers are conducive to improve the charge-transfer kinetics and reinforce the structural durability. As might be expected, the MoSe 2 @NBT@CNFs anode can deliver excellent cycling performance with high reversibility (315.2 mAh g 1 after 800 cycles at 2 A g 1 ) and remarkable rate capability (194.2 mAh g 1 at 30 A g 1 ). The rational design strategy could offer guidance for developing high-performance metal chalcogenide-based electrode materials for SIBs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Changcheng Yang,Xia Zhang,Yu Zhou,Shixiong Hao
The poor visible light utilization and the quick recombination of photogenerated charge of photocatalysts are major issues dominating the application of photocatalysts in the treatment of industrial wastewater. Herein, a novel TiO 2 /g-C 3 N 4 S-scheme heterojunction photocatalyst was constructed by homogeneously embedding hollow octahedral TiO 2 nanoparticles (HOT) in ultra-thin porous g-C 3 N 4 nanosheets (UPCN). SEM and TEM demonstrate that the HOT possesses hollow octahedron structure. The results of XRD, XPS and FT-IR imply that the HOT/UPCN x composites have been prepared successfully. The HOT/UPCN0.4 (mass ratio of TiO 2 to g-C 3 N 4 = 1:2) exhibits the highest chemical oxygen demand (COD) removal rate for real liquor brewing wastewater (LBW) 50.4% which is 2.2 times that of Degussa P25. After 5 cycles of performance test (25 h), the COD removal rate of HOT/UPCN0.4 was reduced by 7.1%. The excellent photocatalytic performance in the degradation of real LBW can be ascribed to the construction of S-scheme heterojunction which extending the light absorption range and providing effective channels for the separation and transfer of charge as well as hollow octahedron and porous structure which enhancing the light utilization. Moreover, the tight interface junction and large contact interface between HOT and UPCN provide more “highways” for the transfer of photogenerated charge.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
jialong Kang,Zhenyun Tian,Dapeng Zhong
The abundant metal Ti is a high-quality metal with lightweight, high strength, and corrosion resistance. However, due to its harsh preparation conditions, the price remains high, so titanium metal's simple and effective products have become a challenge for the world's scientific research community. In this paper, by calculating the oxygen potential of Ti–O, Ti–H, and Ti–H–O solid solutions, the oxygen potential of Ti–H–O was obtained when the oxygen content was 0.03 and 0.009. As H 2 enters the Ti–O lattice, the oxygen potential of the Ti–H–O system increases with the increase of H content. Thermodynamic calculations showed that introducing hydrogen effectively destroyed the stability of Ti–O solid solutions. At the same time, this paper uses a magnesiothermic as a reducing agent. To verify the feasibility of the above thermodynamics, reduce the spent V 2 O 5 –WO 3 /TiO 2 catalyst (Ti > 80 wt%) of titanium-rich materials in a hydrogen atmosphere. Finally, the spent V 2 O5–WO 3 /TiO 2 catalyst was reduced at 750 °C for 8–24 h to obtain TiH 2 powder with an oxygen content of 0.9 wt%.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4277-4287
·
IF 3.3
Jiaxin Mou,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jun Li,Chunzi Xu,Hui Wang,Hongyu Shen
To expand the optical absorption range and charge transfer efficiency of photoanode, the ZnIn2S4/PANI/TiO2/Ti photoanode was developed using a coating method and applied in a photocatalytic fuel cell (PFC) system for the removal of organic pollutants and chemical energy recovery. The prepared photoanode obtained a maximum photocurrent density of 4.19 mA cm−2 (1.2 V vs. SCE). The rhodamine B (RhB) removal efficiency, maximum power density (Pmax) and short-circuit current density (Jsc) of PFC constructed with the ZnIn2S4/PANI/TiO2/Ti composite photoanode and Cu cathode were 93.80% (1 h), 18.83 μW cm−2 and 0.26 mA cm−2, respectively. The improved photocatalytic activity of PFC was due to the outstanding photoelectric properties of the ZnIn2S4/PANI hybrid material, in which PANI, as a photosensitizer, promoted the absorption of visible light by the photoanode. The photoexcited electrons of ZnIn2S4 and PANI tend to be directly transferred to the CB of TiO2, while holes accumulate in the VB of PANI to participate in the oxidation reaction. The synergistic effect accelerates the separation of photogenerated electron–hole pairs and improves the photoelectric conversion efficiency of PFC.
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