CATALYSIS LETTERS
·
2025
·Vol. 155
·期 11
·1-18
·
IF 2.4
Song Zhi,Han Dongxu,Liu Boxia,Jiao Hongqiao,Wang Lin,Liu Jialu,Zhang Xiayan,Huang Yeqiong,Xing Chuhan,Zhang Jing
Titanium dioxide (TiO 2 ) is widely regarded as one of the most promising semiconductor materials for photocatalysis. In this study, through defect engineering, the strong interaction between F − ions and surface Ti 4+ is utilized to induce the generation of oxygen defects, thereby achieving selective etching and exposure of the high-energy {101} crystal plane. At the same time, the coordination effect of Ni on the surface metal active site not only promotes the transition of the forbidden band energy level, but also effectively narrows the band gap of TiO 2 . Through systematic characterization, the successful coordination of Ni and the enhancement of the high-energy state crystal plane stability were confirmed. BET specific surface area test shows that the large specific surface area of Ni-TiO 2 samples provides more surface active sites for photocatalytic reactions. Photoelectric performance tests further show that the introduction of double defect engineering significantly improves the separation and migration efficiency of TiO 2 photogenerated carriers. Degradation experiments showed that Ni-coordinated TiO 2 could efficiently degrade phenol pollutants within 60 min, exhibiting excellent photocatalytic activity. Capture experiments further confirmed that the coupling between non-radical 1 O 2 and free radical •OH is the main active species in photocatalytic degradation. The synergistic effect of the generation of high-energy state facets and Ni coordination significantly improves the separation and migration of photogenerated carriers, thereby enhancing the photocatalytic performance. This work provides a reliable defect engineering strategy for improving the photocatalytic performance of TiO 2 . Graphical In this study, through defect engineering, the strong interaction between F − ions and surface Ti 4+ is used to induce the generation of oxygen defects, thereby achieving selective etching and exposure of high-energy {101} crystal planes. At the same time, the coordination effect of Ni on the surface metal active sites not only promotes the transition of the forbidden band energy level, but also effectively narrows the band gap of TiO 2 . By carefully designing the photocatalytic process, direct degradation of phenol was achieved under the coupling of non-radicals and free radicals. The improvement in photocatalytic activity is due to the increase in specific surface area, which not only broadens the light absorption capacity but also significantly improves the separation and migration of photogenerated carriers. The capture experiment further verified the efficient catalytic mechanism of the Ni-TiO 2 /phenol system, demonstrating that the synergistic effect of the high-energy {101} crystal plane and the highly active Ni coordination was fully utilized to promote the generation of •OH radicals during the reaction and effectively drive the conversion of oxygen molecules into 1 O 2 through vacancy oxidation. This study not only provides a useful reference for the design of high-efficiency and low-energy photocatalysis, but also provides a new solution for the removal of phenol pollution in coal chemical wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tao Wei,Jialong Yin,Heng Zhang,Mengfan Luo,Jia Zhao,Junwei Liu,Bingkun Huang,Zelin Wu,Hongyu Zhou,Yang Liu,Chuanshu He,Bo Lai
Titanium dioxide (TiO 2 ) stands out as a promising semiconductor catalyst in photocatalysis, mainly due to its low cost and high photocatalytic activity. However, the photocatalytic efficiency of TiO 2 is limited by the fast rate of photogenerated electron-hole recombination. In this paper, carbon quantum dots (CQDs) are used to address the issue of electron-hole recombination in TiO 2 . SEM, TEM, XRD, and Raman spectroscopy confirmed that CQDs was successfully loaded onto LM-TiO 2 . Sulfamethoxazole (SMX) was selected as a simulated water pollutant under ultraviolet irradiation. Under ultraviolet irradiation, loaded CQDs onto layered mesoporous TiO 2 (CQDs@LM-TiO 2 ) exhibits superior activity in degrading SMX compared with pure LM-TiO 2 . Quenching, EPR and probe experiments showed that the dominant active species of UV/CQDs@LM-TiO 2 /PI system was single oxygen ( 1 O 2 ). The results of electrochemical characterization, FT-IR and XPS show that the CQDs on the surface of LM-TiO 2 is conducive to the transfer of electrons, thus activating PI to produce 1 O 2 and degrading pollutants. The cyclic and coexisting anion influence experiments show that the catalyst has excellent stability, and the UV/CQDs@LM-TiO 2 /PI system is resistant to co-existing substances in water. Owing to their unique electron transport capacity and wide light response interval, CQDs show great application potential in the field of photocatalysis.
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FUEL
·
2025
·
IF 7.5
Bing Xu,Xin Wu,Qi Lv,Qinyi Yang,Jiaxi Pang,Jian Zhang,Lu Lu,Yu Shen
A novel Pt-RuO 2 /TiO 2 nanorod (Pt-RuO 2 /TNR) composite catalysts are prepared via the polyol method, in which the RuO 2 -TNR supports are synthesized by coprecipitation technology. Morphology characterization results demonstrate that RuO 2 nanoparticles (NPs) load on TNR carrier, and then Pt NPs uniformly disperse on the surface of RuO 2 -TNR with an average particle size of about 3.5 nm. The peak shifts of XPS patterns for Pt and Ti elements indicate the strong metal-support interaction (SMSI) between Pt NPs and RuO 2 -TNR. Compared with Pt/C catalyst, Pt-RuO 2 /TNR exhibits enhanced oxygen reduction reaction (ORR) activity and stability by the use of electrochemical testing techniques. ΔE 1/2 (about 30 mV) towards more positive potential represents the superior ORR performance of Pt-RuO 2 /TNR relative to Pt/C. Furthermore, the electrochemically active surface area (ECSA) of Pt-RuO 2 /TNR decreases only by 28 %, while the one of Pt/C is 53.8 % before and after accelerated degradation tests (ADT) for 20,000 cycles; and the loss on mass activity (MA) of the former (23 %) is much less than the one of the latter (52 %). Moreover, ECSA of Pt-RuO 2 /TNR decays only 5.8 %, whereas a considerable decline of ECSA for Pt/C is 41.5 % before and after corrosion testing for 50 h. Pt-RuO 2 /TNR could be used as an effective carbon-free electrocatalyst to improve the performance and stability of proton exchange membrane fuel cells (PEMFCs).
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiaopeng Bai,Ke An,Lingyu Jia,Yanzhen Guo,Jingtian Hu,Guangri Jia,Ruibin Jiang,Jianfang Wang,Jimmy C. Yu
Titanium nitride has garnered much attention owing to its high charge carrier density and low work function. These merits compensate for the shortcomings of traditional photocatalysts. Herein we report on the synthesis of TiN/TiO2 nanoparticles (NPs) as a new Schottky-barrier-free plasmonic photocatalyst (SBFPP) through the oxidation of commercially available TiN NPs. Our SBFPP possesses abundant oxygen vacancies (OVs) and the ability to generate hot charge carriers. The TiN NPs oxidized at 400 °C for 2 h, which is designated as TiN-2, exhibit broad light absorption and a high OV concentration. Theoretical calculations have revealed that the presence of OVs and nitrogen dopants leads to the formation of defect electronic states in TiO2. Hot electrons from TiN can efficiently migrate to these defect states, hindering the rapid electron–hole recombination. Besides the efficient photocatalytic nitrogen fixation, the TiN-2 NPs also exhibit excellent hydrogen generation performance. Furthermore, the photocatalytic film formed by combining the TiN/TiO2 NPs and a porous poly(vinyl alcohol) film dramatically improves the photocatalytic nitrogen fixation performance, giving an enhancement of ∼4.4 times in comparison with the TiN-2 NPs. This study unveils a promising avenue for the rational design of plasmonic photocatalysts and facilitates the development of practical applications in the field of photocatalysis.
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PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 11
·2623
·
IF 3.2
Jiayi Zhang,Chen Wang,Xiaoguo Shi,Qing Feng,Tingting Shen
Nano-titanium dioxide (TiO 2 ) is currently the most widely studied photocatalyst. However, its rapid recombination of photogenerated carriers and narrow range of light absorption have limited its development. Crystal form regulation and polymer modification are important means for improving the photocatalytic activity of single-phase materials. In this paper, TiO 2 materials of different crystal forms were prepared by changing the synthesis conditions, and they were compounded with trimesoyl chloride–melamine polymers (TMPs) by the hydrothermal synthesis method. Then, their photocatalytic performance was evaluated by degrading methylene blue (MB) under visible light. The mechanisms of influence of TiO 2 crystal form on the photocatalytic activity of TiO 2 -TMP were explored by combining characterization and theoretical calculation. The results showed that the TiO 2 crystal form, through interface interaction, the built-in electric field intensity of the heterojunction, and active sites, affected the interface charge separation and transfer, thereby influencing the photocatalytic activity of TiO 2 -TMP. In the 4T-TMP photocatalytic system, the degradation rate of MB was the highest. These studies provide theoretical support for understanding the structure–property relationship of the interfacial electronic coupling between TiO 2 crystal forms and TMP, as well as for developing more efficient catalysts for pollutant degradation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Wenjie Guo,Yinghua Lan,Jien Niu,Wenwen Chen,Yanhui Zhang,Guoping Li,Juan Xu
A series of TiO 2 -CdS composites were prepared at room temperature using a one-step precipitation method, and an appropriate loading ratio was determined. Compared with pure TiO 2 and CdS, the composites exhibited superior photocatalytic degradation performance in the degradation of ciprofloxacin (CIP) and the reduction of Cr(Ⅵ). The incorporation of an appropriate amount of TiO 2 effectively suppressed the agglomeration of CdS nanoparticles and enhanced interfacial electron transfer, thereby significantly improving photocatalytic efficiency. Furthermore, a metal ion-mediated redox synergistic system was successfully constructed, achieving efficiency breakthroughs in the degradation of bisphenol A (BPA) and ibuprofen (IBU), which exhibited negligible photocatalytic activity under conventional conditions. The influence of different heavy metal ions on the photocatalytic degradation performance of organic pollutants were discussed. This provides a robust theoretical basis for the removal and resource recovery of refractory organic compounds.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2026
·
IF 9.9
Yaofei Lin,Guangheng Wang,Xingxing Meng,Jiahuan Zhao,Hongju Wu,Wenying Zhou
Against the backdrop of the booming sophisticated electronics industry, polymer composites integrating superior dielectric permittivity ( ε ), low loss (tan δ ) and excellent breakdown strength ( E b ) have become a persistent pursuit in the research community. To simultaneously bolster the ε and E b in alumina (Al)/polyvinylidene fluoride (PVDF), in this study the neat Al particles were first surface-oxidized to thicken the alumina (Al 2 O 3 ) thickness and then encapsulated with a titanium dioxide (TiO 2 ) layer, followed by an investigation into the dielectric properties of the resulting Al@Al 2 O 3 @TiO 2 /PVDF composites. The results indicate that the Al@Al 2 O 3 @TiO 2 /PVDF exhibits a higher ε and E b but lower tan δ relative to pristine Al/PVDF. The elevated ε stems from the synergistic regulation of high-frequency fast intra-particle and low-frequency slow inter-particle polarizations in Al@Al 2 O 3 @TiO 2 /PVDF. The Al 2 O 3 @TiO 2 double-shell not only prevents direct contact between conductive Al but also induces deep traps immobilizing charges and lifts the energy barrier for captured charges de-trapping, thus restraining the tan δ and leakage current. Moreover, the double-shell effectively strengthens interfacial interactions and alleviates strong dielectric mismatch between the two components, leading to much reduced electric tree growth and improved E b . Theoretical simulation further reveals a profound understanding of the inherent multiple polarization mechanisms and the charge migration modulation induced by the double-shell structure. So, this work provides unique insights for realizing simultaneously high ε , superior E b and minimal tan δ via core@double-shell structure in percolating composites, which cannot be achieved in traditional composites, offering considerable application potential in power equipment and electric devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Huafeng Tian,Ben Li,Xu Wang,Xiangkun Liao,Weiping Zhou,Fei Gao,Guangsheng Luo,Zhenzhi Cheng
Rational design of both microstructure and composition to achieve magnetic-dielectric synergy serves as an effective strategy for preparing high-performance microwave absorbing materials. This study reports the successful fabrication of rod/flake-shaped FeSiAl@TiO₂ composites via a simple approach combining ball milling and tetrabutyl titanate hydrolysis. The one-dimensional (rod) and two-dimensional (flake) morphologies of FeSiAl induce magnetic shape anisotropy, effectively overcoming the Snoek’s limit and boosting both permeability and magnetic loss at high frequencies. Concurrently, the semiconducting TiO₂ coating moderates the conductive network, reducing the real part of permittivity and achieving favorable impedance matching. Furthermore, abundant heterogeneous interfaces and defects such as oxygen vacancies generated within the composite substantially enhance interfacial and dipole polarization. The synergy between these tailored magnetic and dielectric loss mechanisms results in excellent microwave absorption performance, evidenced by a minimum reflection loss (RL min ) of −50.17 dB at a matching thickness of 1.9 mm and an ultra-wide effective absorption bandwidth of 8.18 GHz at a thickness of 2.0 mm. This work presents a promising strategy for developing high-performance magnetic-dielectric absorbers.
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SURFACE & COATINGS TECHNOLOGY
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2026
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IF 6.1
Jiayin Ji,Huidong Cai,Xiang Li,Chen Zuo,Shuyu Yuan,Qingge Feng,Jingcheng Zhao
Antimicrobial coatings with self-cleaning and long-lasting antibacterial properties are critical for medical applications to reduce healthcare-associated infections. However, existing coatings pose challenges of poor durability, limited light response, or rapid antibacterial agent loss. Herein, we report a scalable strategy to fabricate a Cu 2 O/TiO 2 composite coating (CT-37, Cu:Ti = 3:7 mass ratio) via in-situ chemical reduction and two-step semi-curing spraying, integrating hierarchical micro-nanostructured Cu₂O/TiO₂ particles with lithium polysilicate adhesive. CT-37 exhibits good superhydrophobicity (contact angle ( θ CA ) = 151.3 ± 1.4°, roll-off angle ( θ RA ) =3.4 ± 0.4°), retaining a θ CA > 150° after 10 abrasion cycles and 7 days of acid/alkali immersion. Under visible light, it achieves >99% sterilization efficiency against Escherichia coli and Staphylococcus aureus , and maintains a > 90% bactericidal rate after 50 cycles. This study reveals a novel synergistic mechanism: (i) superhydrophobicity reduces bacterial adhesion by minimizing solid-liquid contact area; (ii) rapid Cu ion release from the coating matrix directly inhibits bacterial proliferation; (iii) photocatalytic generation of reactive oxygen species (ROS, including •O 2 − , h + , and •OH) under visible light further eradicates adhered microbes. This cost-effective coating, coupled with the deepening understanding of its antimicrobial mechanism, paves the way for large-scale medical and public health applications.
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ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Pingfan Du,Lixin Song,Jie Xiong,Ni Li,Lijun Wang,Zhenqiang Xi,Naiyan Wang,Linhui Gao,Hongliang Zhu
Anatase TiO 2 /multi-walled carbon nanotubes (TiO 2 /MWCNTs) hybrid nanofibers (NFs) film was prepared via a facile electrospinning method. Dye-sensitized solar cells (DSSCs) based on TiO 2 /MWCNTs composite NFs photoanodes with different contents of MWCNTs (0, 0.1, 0.3, 0.5, 1 wt.%) were assembled using N719 dye as sensitizer. Field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), and Raman spectrometer were used to characterize the TiO 2 /MWCNTs electrode films. The photocurrent–voltage ( I – V ) characteristic, incident photo-to-current conversion efficiency (IPCE) spectrum, and electrochemical impedance spectroscopy (EIS) measurements were carried out to evaluate the photoelectric properties of the DSSCs. The results reveal that the energy conversion efficiency is greatly dependent on the content of MWCNTs in the composite NFs film, and a moderate incorporation of MWCNTs can substantially enhance the performance of DSSCs. When the electrode contains 0.3 wt.% MWCNTs, the corresponding solar cell yield the highest efficiency of 5.63%. This efficiency value is approximately 26% larger than that of the unmodified counterpart.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Dongsheng Zhou,Bo Li,Zhaoxia Ma,Xiaodong Huang,Xiaobin Zhang,Hangsheng Yang
A synergy between FeO X and CuO X was confirmed in FeCuO X /TiO 2 -hBN composites for selective catalytic reduction of NO with NH 3 . Accordingly, the reducibility of composites was modified to promote the NO to NO 2 oxidation but suppress the NH 3 to NO over oxidation, which is of benefit to the NO reduction. Also the optimal operation temperature could be controlled by tuning the Fe:Cu atomic ratio, and Fe 10 Ti 85 BN 5 , Fe 7.5 Cu 2.5 Ti 85 BN 5 and Fe 2.5 Cu 7.5 Ti 85 BN 5 achieved the best NO removal above 90% at 375 °C, 300 °C and 250 °C, respectively. From the NO 2 and NH 3 adsorption behaviors over FeCuO X /TiO 2 -hBN, the reaction followed Langmuir–Hinshelwood mechanism below 275 °C, but followed Eley–Rideal mechanism above 350 °C. The influence of SO 2 on NO removal was found to be temperature dependent, at temperature below 325 °C, slight deactivation was observed, while a promotion was achieved above 350 °C.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jimin Du,Huiming Wang,Mengke Yang,Kaidi Li,Lixin Zhao,Guoyan Zhao,Sujuan Li,Xiaolei Gu,Yalan Zhou,Le Wang,Yating Gao,Weimin Wang,Dae Joon Kang
Efficient production of H 2 via solar-light-driven water splitting by a semiconductor-based photocatalyst without noble metals is crucial owing to increasingly severe global energy and environmental issues . However, many challenges, including the low efficiency of H 2 evolution, low solar light absorption , excited electron–hole pair recombination, and slow transport of photoexcited carriers, must be resolved to enhance the H 2 photoproduction efficiency and photocatalyst stability. Here, a two-step method is used to synthesize advanced H 2 -generating photocatalysts consisting of pyramid-like CdS nanoparticles grown on a porous TiO 2 monolith, which show promising photocatalytic activity for the hydrogen evolution reaction . Furthermore, the stability of the photocatalysts is examined through long-term tests to verify their good durability. Without noble metals as cocatalysts , the photocatalyst can reach a high H 2 production rate of 1048.7 μmol h −1 g −1 under UV–vis irradiation when the ratio of the CdS nanoparticles to TiO 2 is 5 mol%. This unusual photocatalytic activity arises from the wide-region light adsorption due to the narrow band gap of CdS, effective separation of electrons and holes due to conduction band alignment at the CdS–TiO 2 interface, and favorable reaction sites resulting from the porous structure .
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