CHEMICAL PHYSICS LETTERS
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2023
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IF 2.8
Yue Chen,Huan Liu,Liang Hu,Youliang Shen,Lingfang Qiu,Liezhen Zhu,Qianxiang Shi,Xun Xu,Ping Li,Shuwang Duo
Novel Z-scheme ZnIn 2 S 4 /TiO 2-x photocatalyst was successfully fabricated through self-sacrificing template-chemical bath deposition combined with a NaBH 4 reduction method for the first time. It was found that ZnIn 2 S 4 /TiO 2-x exhibited high-efficient visible-light photocatalytic RhB degradation of 91 % within 40 min, which was almost 45.5, 1.2, and 6.1 times better than that of TiO 2 , ZnIn 2 S 4 /TiO 2 , and TiO 2-x , respectively. Moreover, an obscure change in catalytic activity can be observed after five recycles. The excellent photocatalytic performance can be attributed to the synergistic effect of Ov, ZnIn 2 S 4 , and MOF-derived TiO 2 , which extend the visible-light photoresponse range and promote the separation of photo-generated charge carriers.
研究领域:
材料科学
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化学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Tarek A. Gad-Allah,Ruiyang Zhang,Yi Wang,Ying Zhou
Various factors control the photocatalyst efficiency including the lifetime of photogenerated charge carriers, photocatalyst surface energy, and light harvesting efficacy. In this study, the defective (001)-TiO 2 -x/h-BN composite was synthesized by a facile one-pot method to merge the fantastic features of the reactive metastable (001) facet and self-defects in TiO 2 anatase crystals with the 2D h-BN. Pure anatase phase of TiO 2 was obtained by the suggested preparation method, which contains ∼33 % of the exposed (001) facet. The predominancy of oxygen vacancy in TiO 2 crystals was proved experimentally and theoretically by the DFT calculations. The defects in TiO 2 along with the incorporated h-BN caused better light harvesting and longer charge lifetime. The prepared defective (001)-TiO 2 -x/h-BN was applied efficiently for NO removal with very limited release of the toxic NO 2 by-product as an environmental application. The detected oxygen vacancy in TiO 2 along with h-BN were found to play a synergistic enhancement for NO removal. However, more defects reduced the overall activity because of rapid oxidation of oxygen vacancies on surface of the photocatalyst. To sum up, the defective (001)-TiO 2 -x/h-BN composite can be considered as a promising material for environmental applications.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2026
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IF 4.4
Nan Zheng,Xinyue Liu,Meng Lan,Xiaoli Dong,Yubo Zhang
Co-TiO 2-x with abundant OVs made via one-step hydrothermal. • Optimal sample: high NH 3 yield, good stability & selectivity. • Co & OVs enhance N 2 adsorption/activation for sustainable NH 3 . Photocatalytic nitrogen fixation represents a promising green technology for ammonia synthesis, but its efficiency is largely limited by the adsorption and activation of N 2 molecules on catalyst surfaces. In this study, cobalt-doped brown TiO 2-x with abundant oxygen vacancies was successfully synthesized via a simple one-step hydrothermal method. The brown TiO 2-x exhibits excellent light absorption capacity and abundant oxygen vacancies. Cobalt doping further promotes the separation of photogenerated charge carriers and the photocatalytic reduction ability of brown TiO 2-x , while also inducing the generation of additional oxygen vacancies (OVs). These OVs serve as active sites, effectively improving the adsorption and activation of N 2 , and subsequently reducing it to ammonia. Experimental results demonstrate that the photocatalytic nitrogen fixation performance of the Co doped TiO 2-x is significantly improved. The as-fabricated 7%Co-doped TiO 2-x sample achieves an ammonia production rate of 257.58 μmol·g −1 ·h −1 . In addition, it also exhibits good stability and NH 3 selectivity. This work highlights the promise of coupled doping and defect engineering for creating high-efficiency photocatalysts for sustainable ammonia production. Download: Download high-res image (365KB) Download: Download full-size image
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高影响因子
ACS Catalysis
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2017
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IF 10.614
Ming Xu,Shan He,Hao Chen,Guoqing Cui,Lirong Zheng,Bin Wang,Min Wei
The modulation of strong metal–support interaction (SMSI) plays a key role and remains a challenge in achieving the desired catalytic performance in many important chemical reactions. Herein, we report a TiO2–x-modified Ni nanocatalyst with tunable Ni–TiO2–x interaction via a two-step procedure: preparation of Ni/Ti mixed metal oxide (NiTi–MMO) from NiTi-layered double hydroxide (NiTi–LDH) precursor, followed by a further reduction treatment at different temperatures. A combination study (XRD, TEM, H2-TPR, XPS, and in situ EXAFS) verifies that a high reduction temperature enhances the Ni–TiO2–x interaction, which results in an increased coverage degree of Ni nanoparticles by TiO2–x as well as electron density of interfacial Ni (Niδ−). Moreover, the creation of a Niδ−–Ov–Ti3+ interface site (Ov denotes oxygen vacancy) induced by strong Ni–TiO2–x interaction serves as dual-active site to efficiently catalyze the water–gas shift reaction (WGSR). The optimized catalyst (Ni@TiO2–x(450)) via tuning Ni–TiO2–x interaction gives a TOF value of 3.8 s–1, which is ∼7 times larger than the conventional 15%Ni/TiO2(450) catalyst. Such a high catalytic efficiency is attributed to the interfacial site (Niδ−–Ov–Ti3+) with medium strength of metal–support interaction, as revealed by in situ diffuse reflectance Fourier transform infrared spectroscopy (in situ DRIFTS), which promotes the synergic catalysis between Niδ− and oxygen vacancy toward WGSR.
研究领域:
催化化学
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材料科学
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表面科学
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能源化学
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纳米催化
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DOI
高影响因子
Materials Today Chemistry
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2025
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IF 6.7
Caifeng Zhao,Lu Liu,Yiji Zhou,Dongning Wei,Binghua Yan,Leping Zhang,Hongke Xie,Die Hu,Hongrui Wang,Sai Shao,Longxin Jin
Efficient photocatalytic degradation of atrazine is a crucial method for enhancing the control of pesticide residues. In this study, a TiO 2−x nanotube (TNT) photocatalyst with surface/bulk oxygen vacancies (OVs) was fabricated via γ-ray irradiation reduction. Peroxymonosulfate (PMS) activation by surface/bulk OVs to accelerate the photocatalytic degradation atrazine (ATZ) was elucidated. Compare with no-radiation TNT (TNT-0), abundant OVs were distributed on the surface and bulk of TNT prepared via 56.5-kGy radiation reduction (TNT-56.5), which increased the hydroxyl oxygen content from 14.24 % to 33.66 %. Under visible light irradiation and PMS activation, the degradation kinetic constant of TNT-56.5 was 4.25-fold higher than that of TNT-0. Density functional theory calculations were performed to analyze the role of localized electrons of TNT-56.5 in PMS activation. Results showed that OVs were beneficial for the adsorption of ATZ and HSO 5 − . The oriented transfer of electrons from oxygen vacancy (OV) to PMS caused HSO 5 − heterolysis. Moreover, PMS activation by surface/bulk OVs synergistically produced radicals such as 1 O 2 , h + , •O 2 −, •OH, and •SO 4 − , which degraded ATZ; among these, 1 O 2 and h + were the core oxidizing species. The synergistic system (TNT-56.5/PMS/vis) exhibited broad pH adaptability and durable recyclability. This study presents direct evidence for surface/bulk OVs in enhancing PMS activation for the degradation of ATZ, providing a sustainable strategy for the degradation of pesticide residues.
研究领域:
环境催化
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材料科学
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光催化
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水处理
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高级氧化技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Fan Yang,Lulu Zhang,Feifei Li,Zhipeng Zhang,Luyao Cui,Rui Li,Caimei Fan,Jianxin Liu
Hydrogen spillover effects will significantly improve the activity of photocatalytic hydrogen evolution reactions (HER), while their introduction and optimization require the construction of an excellent metal/support structure. In this study, we have synthesized Ru/TiO 2-x catalysts with controlled oxygen vacancy (OVs) concentrations using a simple one-pot solvothermal method . The results show that Ru/TiO 2-x3 with the optimal OVs concentration exhibits an unprecedentedly high H 2 evolution rate of 13604 μmol·g −1 ·h −1 , which was 45.7 and 2.2 times higher than that of TiO 2-x (298 μmol·g −1 ·h −1 ) and Ru/TiO 2 (6081 μmol·g −1 ·h −1 ). Controlled experiments, detailed characterizations, and theoretical calculations have revealed that the introduction of OVs on the carrier contributes to the hydrogen spillover effect in the metal/support system photocatalyst and that the process of hydrogen spillover in this system can be optimized by modulating the OVs concentration. This study proposes a strategy to decrease the energy barrier of hydrogen spillover and enhance photocatalytic HER activity. Moreover, it investigates the effect of OVs concentration on the hydrogen spillover effect in the photocatalytic metal/supports system.
研究领域:
材料科学
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催化化学
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能源科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Xiangchen Kong,Huiming Huang,Zhaoyang Li,Yanqin Liang,Zhenguo Li,Shengli Zhu
TiO 2 (B) nanosheets/GO (graphene oxide) hybrids are considered to be outstanding performance photocatalysts for high efficiency of H 2 evolution. However, they still suffer severe challenges during the synthetic processes, such as a large amount of the capping agents adhering on the surface and easy occurrence of aggregation. To figure out these obstacles, Ar plasma treatment as a modified method in this study not only enable the TiO 2 (B) nanosheets distributed uniformly on the GO sheets but also engineer defects within TiO 2 (B) nanosheets to significantly improve the photocatalytic activity for the water splitting. The hydrogen evolution rate of the TiO 2- x (B)/GO sheets is 1.4 times higher compared with that of original TiO 2 (B)/GO sheets without Ar plasma treatment. The improved photocatalytic properties were owing to the synergetic effects of oxygen vacancies and the heterojunction between GO and TiO 2 (B), which can promote the visible light utilization and accelerate separation and transportation of photogenerated electron-holes. This study can provide a facile pathway to prepare the two-dimensional hybrid photocatalysts with high photocatalytic H 2 activity.
研究领域:
材料科学
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纳米科技
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能源化学
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光催化
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二维材料
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junwei Yin,Junyan Kuang,Siyu Tan,Qi Zhu,Wei Zhou
A novel plasmonic Ag decorated S-TiO 2− x nanorods are successfully fabricated under 700 °C calcination, then followed by an in-situ solid-state chemical reduction approach with NaBH 4 in a mild calcination (350 °C) and combined with photo-deposition approach. The resultant Ag/S-TiO 2− x sample with high crystallinity and narrow band gap of ∼2.39 eV, extends the photoresponse to near-infrared region. The visible-light-driven photocatalytic degradation rate of phenol and hydrogen production rate for Ag/S-TiO 2− x nanorods are as high as 98.67% and 209.2 µmol h −1 g −1 , which is about 2 and 5 times higher than that of S-TiO 2 . Especially, first-order reaction rate constant of Ag/S-TiO 2− x nanorods is 14 times higher than that of S-TiO 2 . The excellent photocatalytic property can be attributed to the synergistic effect of Ti 3+ self-doping, S doping and the enhanced surface plasmon resonance of Ag nanoparticles, which narrows the band gap, favors the visible light utilization, and promotes the separation of photogenerated charge carriers.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2018
·Vol. 44
·期 8
·4797-4807
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IF 1.674
Zhang Weiwei,Zhou Yi,Dong Chunyang,Shen Bin,Xing Mingyang,Zhang Jinlong
We introduce a facile method to synthesize carbon quantum dots/titanium dioxide mesoporous single crystals (CQDs–MSCs). CQDs were synthesized using a pyrolysis method with citric acid as carbon precursor. V-CQDs–MSCs composite was prepared using a vacuum activation method and exhibited enhanced photocatalytic activity. The composites were characterized by diffuse reflectance spectroscopy (DRS), electron paramagnetic resonance (EPR), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) analysis, and thermogravimetry (TG) analysis. XPS results indicated that CQDs were bonded on the surface of MSCs by formation of Ti–O–C bonds, which played an important role in transfer of photogenerated electrons from Ti 3+ –TiO 2 to CQDs. V-CQDs–MSCs obtained using CQD loading content of 2% and vacuum activation temperature of 600 °C showed the highest photocatalytic activity for degradation of phenol under simulated solar light irradiation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2020
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IF 4.189
Lina Lin,Xiaoyu Feng,Dengpeng Lan,Yuang Chen,Qilan Zhong,Chao Liu,Yan Cheng,Ruijuan Qi,Jianping Ge,Chengzhong Yu,Chun-gang Duan,Rong Huang
Interface structure plays an extremely important role in the charge-transfer and photocatalytic performances in plasmonic metal/semiconductor systems. Defect engineering by introducing an oxygen vacancy (Ovac) is an effective way to modulate the interface structure. Here, a representative photocatalyst system including TiO2, TiO2–x, Au-TiO2 and Au-TiO2–x as designed delicately to reveal the detailed mechanism of the plasmon-resonance-induced charge separation in interfacial defect structure from the nanoscale. The local charge transfer via a conducting amorphous-like interface layer is visualized as the arched valence change from Ti3+ to Ti4+ at the Au-TiO2–x interface after Schottky contact. This phenomenon eventually leads to the enhancement of localized surface plasmon resonance (LSPR) at 2.3 eV, and the introduction of Ovac reduces the Schottky barrier height of Au-TiO2–x by 5 mV compared with that of Au-TiO2. Under visible light, Au-TiO2–x excites the most photogenerated carriers to the surface, which is larger than that of TiO2–x and Au-TiO2. It can be concluded that the changes in electronic structure eventually promote charge transfer in visible light and explain the original reason that the coupling of Ovac and Au could improve the photocatalytic performance.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Hao Liu,Xiao Zhang,Qiang Xu,Yanmei Jin,Shuliang Lv,Haihui Liu
Silicon-based anodes, with a theoretical capacity of ∼4200 mAh/g, are promising candidates for lithium-ion batteries. However, significant volume expansion during cycling leads to electrode fragmentation and poor cycling stability. This study presents a novel approach leveraging metal oxide coatings to simultaneously enhance the mechanical stability and the electronic and ionic diffusion capabilities of silicon-based anodes. TiO2–x/SiOx nanocomposites with a Maudan-like structure were synthesized via hydrolysis and subjected to high-temperature reduction in a H2/Ar atmosphere. The unique heterogeneous structure of these composites features oxygen vacancies in TiO2–x, which induce localized electronic states and generate embedded electric fields at the interface with TiOx. The oxygen vacancies provide additional pathways for electron transport and ion storage, while the embedded electric fields further optimize the electronic and ionic transport properties of the material. This synergistic effect significantly enhances the diffusion of electrons and lithium ions at the interface, effectively mitigating volumetric strain during electrochemical cycling. At a current density of 1 C, the TiO2–x/SiOx composite electrode maintains a capacity of 608.4 mAh/g after 1000 cycles. The synergistic effects of oxygen vacancies and embedded electric fields in TiO2–x/SiOx provide new avenues for silicon-based anode materials, particularly in electric vehicles and energy storage systems.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2025
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IF 4.8
Chi Zhang,Junwen Zhang,Lina Che,Xusheng Wang,Li Shi
Photothermal technology offers distinct advantages for catalytic CO 2 methanation. Herein, we synthesized a series of Ni-based catalysts (denoted as TiO 2-x /Ni-X) through controlled calcination of NiTi-layered double hydroxides (LDHs) precursors at 400–700°C. In a continuous-flow system under xenon lamp irradiation (3.2 W/cm²), the TiO 2-x /Ni-X catalysts exhibited a reduction temperature dependent CH 4 production rate. During 40-hour stability testing, the optimized TiO 2-x /Ni-550 catalyst achieved a sustained CH 4 production rate of 180 mmol g cat −1 h −1 with a remarkable near-unity selectivity (>99 %), and the light irradiation substantially enhanced the CH 4 yield compared to bare thermal catalysis. Comprehensive structural characterization and mechanistic studies revealed competing roles governing catalytic activity, with TiO 2-x /Ni-550 demonstrating an optimal balance for CH 4 generation kinetics.
研究领域:
催化化学
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环境科学
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材料科学
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能源化学
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物理化学
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DOI
高影响因子
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