CHINESE JOURNAL OF CATALYSIS
·
2018
·Vol. 39
·期 3
·510-516
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IF 3.525
Shunhang Wei,Shuang Ni,Xiaoxiang Xu
Ti 3+ species and oxygen vacancies were successfully introduced into anatase TiO 2 by a simple method. The physicochemical properties of the as-prepared samples were explored by techniques including X-ray diffraction and field emission scanning electron microscopy . The amount of H 2 O 2 precursor and hydrothermal reaction time were found to affect the formation of the TiO2 nanorod-type microstructure. Possible mechanisms for the formation of this microstructure are proposed on the basis of analytical results, including electron paramagnetic resonance , where parameters such as the amount of H 2 O 2 and hydrothermal reaction time were adjusted. More importantly, light absorption in the visible light region was strongly affected by the number of oxygen vacancies within the samples. The oxygen vacancy content featured an optimal level for producing the highest photocatalytic hydrogen production activity.
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ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Jingjing Wang,Yun Wang,Wei Wang,Tong Peng,Jianjun Liang,Ping Li,Duoqiang Pan,Qiaohui Fan,Wangsuo Wu
The photocatalytic reduction of U(VI) is recognized as an economical and effective way for U(VI) removal/recovery from solutions. To improve the photocatalytic activity of TiO 2 under visible light, TiO 2 was hydrogenated by NaBH 4 to generate Ti 3+ self-doped black TiO 2 (BT n ). The self-doped Ti 3+ alongside oxygen vacancies (Ov) could act as interband level to increase visible light capture and reduce the recombination of photogenerated carriers. The obtained BT n samples showed high performance for U(VI) elimination under near neutral conditions, and held an outstanding anti-interference for U(VI) over competing metal cations and anions. Methanol and ethanol could act as sacrificial donors, being favorable for the photocatalytic reduction of U(VI), while the presence of EDTA inhibited the photoreduction of U(VI). The BT n photocatalysts showed relatively high stability and reusability during the photocatalysis and elution processes. The XPS, TEM and XRD results revealed that U(VI) was photo-reduced to form UO 2 on the surface of BT n . This work may serve as an important reference for improving the photocatalytic reactivity of TiO 2 as well as for the efficient removal/recovery of U(VI) from aqueous solutions.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12561-12569
·
IF 6.4
Chen Xi Li,Xiang Li,Xin Yi Chen,Chen Chen,Lei Zhao,Nan Ma
Ferroelectric materials possess piezoelectric, pyroelectric, and photovoltaic properties simultaneously, making them ideal for use in multi-sensor applications. However, it has been challenging to balance the photovoltaic properties with piezoelectric/pyroelectric properties within a single material due to the narrow bandgap and ferroelectricity being incompatible. In this study, Ti3+ self-doping in BaTiO3 (BTO) ceramic is proposed as a solution to reduce the bandgap while maintaining the ferroelectric properties. The influence of Ti3+ self-doping on the piezoelectric, pyroelectric, and photovoltaic properties was systematically investigated. It was found that Ti3+ self-doping not only reduces the bandgap but also enables good ferroelectric properties in BTO. This results in a piezoelectric coefficient of 75 pC/N, a pyroelectric coefficient of 59 μC m−2 K−1, and a significant increase in photocurrent by 672.7% under 405 nm illumination. Therefore, Ti3+ self-doped BTO exhibits great potential for multisensory applications for detecting contact force, temperature, and light. These findings provide a new approach to expanding the application of multifunctional ferroelectric materials.
研究领域:
材料科学
·
铁电材料
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传感器
·
光伏
·
陶瓷
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高影响因子
Journal of Energy Chemistry
·
2026
·
IF 15.6
Yeqing Shen,Guoyao Li,Junduo Chen,Hezhou Liu,Huanan Duan
The advancement of all-solid-state lithium batteries (ASSLBs) is significantly hindered by the trade-off between ionic conductivity and interfacial stability of solid-state electrolytes (SSEs). Chloride SSEs, particularly Li 2 ZrCl 6 , offer high oxidation stability but suffer from moderate ionic conductivity and intrinsic instability against lithium metal. This work, by introducing redox-active aliovalent substituents, attempts to address these interconnected challenges and endow extra electrochemical capacity for chloride electrolytes. Specifically, Li 2+4 x Zr 1−4 x Ti 3 x Al x Cl 6 (4 x = 0.15) exhibits enhanced ionic conductivity (0.87 mS cm −1 ) and low activation energy (0.218 eV). Interestingly, cyclic voltammetry and X-ray photoelectron spectroscopy tests confirm that the incorporated Ti 3+ ions serve as reversible redox centers (Ti 3+ /Ti 4+ ), providing the chloride electrolyte an extra specific capacity of 9.68 mAh g −1 . This transforms the SSE from an ion conductor into a capacity contributor. Furthermore, by designing a Li 5.4 PS 4.4 Cl 1.6 (LPSC)-Li 2+4 x Zr 1−4 x Ti 3 x Al x Cl 6 bilayer electrolyte, the chloride acts as an “anchor” layer to effectively suppress the dendrite propagation, enabling the symmetric lithium cell to cycle stably at 0.6 mA cm −2 . When assembled into ASSLBs with LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) cathode and Li anode, the battery delivers a high specific capacity of 185.30 mAh g −1 at 0.05 C, demonstrating superior rate capability and cycling stability (84.12% capacity retention after 120 cycles at 0.2 C) compared with the unsubstituted chloride. This work presents a paradigm-shifting approach to designing redox-active, high-performance chloride SSEs, paving a new avenue for developing high-energy-density ASSLBs.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2017
·
IF 2.764
Chang Liu,Xiang Zhu,Peng Wang,Yisen Zhao,Yongqing Ma
The Fe 3 O 4 @TiO 2 catalyst was reduced in a mixed H 2 /N 2 atmosphere at temperatures of 400, 600, 800 and 1000 °C in order to produce the oxygen vacancies (O v ) and Ti 3+ ; Simultaneously, Fe 3 O 4 was reduced to Fe, a strongly magnetic material, beneficial for the magnetic separation after the photo-degradation. The optimal catalyst was obtained at the reducing temperature of 800 °C, which possesses the good photocatalytic performance and recycled activities; Moreover, its saturation magnetization M s is highest, reaching 23.8 emu g −1 which improves the magnetic separability. This optimal catalyst was subsequently treated in the NH 3 atmosphere at temperatures of 500, 600 and 700 °C, aiming to investigate the effects of N-doping in TiO 2 . The 600 °C treated catalyst exhibited the optimal photocatalytic performance. The factors that affect the photocatalytic performance are revealed and discussed in detail, including the ratio of O v and N dopant in TiO 2 as well as the interface states between TiO 2 and the magnetic particles.
研究领域:
材料科学
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化学工程
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环境科学
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yushan Yang,Xiaofen Wang,Shunzhong Luo,Xiaoyong Yang,Jiang Ma
[Cs x Ba y ][(Al 3+ ,Ti 3+ ) 2 y + x Ti 4+ 8-2 y - x ]O 16 (0.4 ≤ x , y ≤ 0.8) ceramics were synthesized to investigate the substitution effects of Ba 2+ for Cs + on the stability of hollandite-ceramic waste forms. It was found that the substitution of Ba 2+ for Cs + in the (Cs,Ba)-hollandite system does not cause substantial variation in the crystallographic phase and microstructure. The normalized release rates of Cs and Ba at 90 °C in deionized water were < 0.005 g m −2 d −1 after 28 days. These results indicate that hollandite ceramics are an ideal host for permanent radioactive caesium disposal.
研究领域:
材料科学
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核废料管理
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高影响因子
RSC Advances
·
2026
·Vol. 16
·期 11
·10243-10254
·
IF 6.1
Wenhao Liu,Yanfeng Zhu,Zhihao Liu,Jianxia Gou
Marine corrosion poses a critical threat to the safety of offshore oil and gas facilities. To address the intrinsic drawbacks of pristine TiO2, ZnS/CdS/Ti3+-TiO2 nanotube composites were rationally fabricated via a synergistic strategy combining electrochemical anodization and successive ionic layer adsorption and reaction (SILAR) techniques. Structural and optical characterization confirmed that the as-synthesized composites feature a well-constructed cascade band alignment, which efficiently mitigates the recombination of photogenerated electron–hole pairs. Accordingly, the optimized photoanode delivered a high photocurrent density of 279 µA cm−2. When coupled with 316 stainless steel (316 SS), the composite exhibited a pronounced photo-induced potential of −0.89 V (vs. SCE), achieving a remarkable performance enhancement over pristine TiO2. This enhanced photocathodic protection originates from the synergistic interplay between Ti3+ self-doping and the ZnS/CdS heterojunction: Ti3+ self-doping introduces abundant electron donors to enhance the electrical conductivity of the composite, whereas the ZnS/CdS heterojunction broadens the visible-light absorption range and accelerates the separation and directional migration of photogenerated charge carriers.
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PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2018
·
IF 6.012
Yuan Yao,Mingxuan Sun,Xiaojiao Yuan,Yuanhua Zhu,Xiaojing Lin,Sambandam Anandan
N/Ti 3+ co-doping multiphasic TiO 2 /BiOBr heterojunctions (NT-TBx) were prepared by one-step in situ hydrothermal processes. The crystal phase, morphology, component, and optical properties of the heterojunctions were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, and Ultraviolet–visible diffuse reflectance spectroscopy techniques, respectively. The as-prepared samples exhibit better sonocatalytic activity for the degradation methylene blue, Rhodamine B, and p -Nitrophenol aqueous solution compared with pristine TiO 2 and N/Ti 3+ co-doping multiphasic TiO 2 . Especially, the highest degradation ratio of methylene blue was achieved for NT-TB 0.3 up to 98.2% after 50 min under ultrasonic irradiation. The high sonocatalytic activity has been kept after four cycles with the tiny decline, indicating the excellent stability of the as-prepared samples. The improvement of sonocatalytic activity could be attributed to the formation of doping level and multiphasic TiO 2 /BiOBr heterojunctions, which account for the absorption of long wavelength light and the electron-hole pair separation, respectively. Furthermore, superoxide radical ( O 2 − ) was demonstrated to be the main reactive species for the degradation of methylene blue under ultrasonic irradiation. This study provides a facile fabrication procedure for N/Ti 3+ co-doping multiphasic TiO 2 /BiOBr heterojunctions and demonstrates an efficient route to promote the application of TiO 2 in addressing environment-related issues.
研究领域:
材料科学
·
环境催化
·
纳米材料
·
光催化与声催化
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Junwei Yin,Zipeng Xing,Junyan Kuang,Zhenzi Li,Meng Li,Jiaojiao Jiang,Siyu Tan,Qi Zhu,Wei Zhou
Bi plasmon-enhanced mesoporous Bi 2 MoO 6 /Ti 3+ self-doped TiO 2 microsphere heterojunctions (Bi-BMO/TiO 2-x ) have been synthesized by a mild hydrothermal method combined with an in situ solid-state chemical reduction process, and subsequently annealed at 400 °C in N 2 atmosphere. The prepared Bi-BMO/TiO 2-x photocatalysts are characterized by X-ray diffraction, N 2 adsorption, scanning electron microscopy, transmission electron microscopy , and X-ray photoelectron spectroscopy. The results reveal that Ti 3+ self-doped TiO 2 is loaded on surface of mesoporous Bi 2 MoO 6 microsphere efficiently and metallic Bi is produced for surface plasmon resonance (SPR). Under visible-light irradiation, the heterojunctions photocatalyst shows excellent photodegradation and photoelectrochemical properties of ∼95% for phenol removal rate and 20 μA/cm 2 for photocurrent density, respectively, which is several times higher than that of single component. Moreover, it also has high photocatalytic oxygen production with a rate of 134 μmol h -1 g -1 . The enhanced photocatalytic activities are mainly attributed to the existence of Ti 3+ self-doping and heterojunction structure, which narrow the band gap to extend photoresponse to visible light region. Another reason is the influence of SPR of metallic Bi. They all promote the spatial separation and transfer of photogenerated charge carriers.
研究领域:
材料科学
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环境科学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhiyuan Su,Fan Fang,Xue Li,Wenjun Han,Xianglei Liu,Kun Chang
SrTiO 3 as a photocatalytic overall water splitting material has received extensive attention in recent years, while effectively suppressing Ti 3+ is the key to enhancing the photocatalytic performance. Herein, a polymerizable complexation method is employed to enable Al 3+ uniformly enter into SrTiO 3 lattice for reducing Ti 3+ , and substituting Ti 4+ with the formation of oxygen vacancy. Thus, the photogenerated carrier transport is promoted, and the resulting appropriate surface oxygen vacancy is also conducive to the adsorption of water molecules and OH*. The optimized 2% Al 3+ -doped SrTiO 3 possesses a lower Ti 3+ concentration, compared with the same sample prepared by the solid-phase griding method. Consequently, 2% Al-STO sample deposited co-catalysts achieves the highest activity and durability with the H 2 and O 2 evolution rates of 1.256 mmol·h −1 and 0.692 mmol·h −1 (0.04 g catalyst), respectively, corresponding to the AQE value of 55.46% at 365 nm. The characterizations and DFT calculation results reveal that the uniform Al 3+ doping promotes the increase in the surface oxygen vacancy, which is beneficial for accelerating the reduction reaction and facilitating carrier separation and migration, therefore enhancing the overall water splitting reaction.
研究领域:
材料科学
·
能源科学
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DOI
PubMed
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Weiyao Yang,Mengchen Fu,Chenyu Yang,Yiwen Zhang,Chun Shen
Despite wide applications of noble metal-based catalysts in 5-hydroxymethylfurfural (HMF) oxidation, promoting the catalytic performance at low loading amounts still remains a significant challenge. Herein, a series of metal oxide modified MO x -Au/TiO 2 (M = Fe, Co, Ni) catalysts with low Au loading amount of 0.5 wt% were synthesized. Addition of transition metal oxides promotes electron transfer and generation of the Au δ − –O v –Ti 3+ interface. A combination study reveals that the dual-active site (Au δ − -O v -Ti 3+ ) governs the catalytic performance of the rate-determining step, namely hydroxyl group oxidation. Au δ − site facilitates chemisorption and activation of O 2 molecules. At the same time, O v -Ti 3+ site acts as the role of “killing two birds with one stone”: enhancing adsorption of both reactants, accelerating the activation and dissociation of H 2 O, and facilitating activation of the adsorbed O 2 . Besides, superoxide radicals instead of base is the active oxygen species during the rate-determining step. On this basis, a FDCA yield of 71.2% was achieved under base-free conditions, complying with the “green chemistry” principle. This work provides a new strategy for the transition metal oxides modification of Au-based catalysts, which would be constructive for the rational design of other heterogeneous catalysts.
研究领域:
催化化学
·
材料科学
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环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Shunhang Wei,Rong Wu,Xiaoxiang Xu,Jikang Jian,Haixia Wang,Yanfei Sun
Black core-shelled anatase titania were successfully prepared using a simple one-step synthetic method by calcining colloid titania precursor in N 2 flow under atmospheric pressure. The physicochemical properties of the as-prepared samples were characterized by various techniques such as X-ray diffraction, high resolution transmission electron microcopy, etc. The samples demonstrate a unique core-shelled structure and electron paramagnetic resonance spectra reveal the presence of high concentration of Ti 3+ and oxygen vacancies at the surface, which accounts for their black appearance. A possible mechanism for the formation of such core–shell structure is proposed based on the results (X-ray photoelectron spectra, etc) of products prepared under different ration between urea and hydrochloric acid. Ethanol absolute is found to have critical effect in preventing phase transition of titania (from anatase to rutile) upon elevated temperatures. The black appearance of the sample powder (high visible light absorption) as well as slow electron/hole recombination rate after introducing oxygen vacancies/N species signify the core-shelled anatase titania as an efficient visible light active photocatalyst.
研究领域:
材料科学
·
光催化
·
纳米材料
·
表面化学
·
无机合成
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高影响因子
危险品化学品经营许可证（带存储）