Nanoscale
·
2015
·Vol. 7
·期 28
·12215-12224
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IF 7.394
Yongquan Zhang,Qiang Fu,Qiaoling Xu,Xiao Yan,Rongyu Zhang,Zhendong Guo,Fei Du,Yingjin Wei,Dong Zhang,Gang Chen
N-doped TiO2-B nanowires are prepared by the solvothermal method using TiN nanoparticles as the starting material. X-ray photoelectron spectroscopy shows that the N dopants preferentially occupy the interstitial sites of TiO2-B up to a content of ∼0.55 at%. Above this critical value, the N dopants will substitute the oxygen atoms which improve the electronic conductivity of TiO2-B. The maximum proportion of substituted-N in the TiO2-B nanowires is ∼1.3 at%. Raman scattering shows that the substituted-N strengthens the Ti(1)–O1–Ti(2) and O1–Ti(1)–O3 bonds of TiO2-B. This improves the stability of the corresponding local structures, thus reducing the distortion of the Li+ diffusion channel along the b-axis of TiO2-B. As a result, the substituted-N has more of an impact on the electrochemical properties of TiO2-B than the interstitial-N does. The TiO2-B nanowires containing substituted-N dopants exhibit a remarkably enhanced electrochemical performance compared to pure TiO2-B. They show a discharge capacity of 153 mA h g−1 at the 20 C rate with a capacity retention of 76% after 1000 cycles. In addition, they can deliver a discharge capacity of 100 mA h g−1 at an ultra-high rate of 100 C, indicating their great potential in high power lithium ion batteries.
研究领域:
材料科学
·
电化学
·
储能
·
纳米材料
·
锂离子电池
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Xiangchen Kong,Shijie Hong,Xuyang Dong,Panpan Jiang,Kaiyue Wang,Yuming Tian
Mild calcination preserves porous TiO 2 (B) nanosheets and tunes oxygen vacancies • Oxygen vacancies stabilize highly dispersed metallic Cu on TiO 2 (B) • Cu-Vo interfaces promote electron transfer and suppress charge recombination • Cu-TiO 2 (B)-200 reaches 7.92 mmol g -1 h -1 under AM 1.5 simulated sunlight TiO 2 (B) is a promising photocatalyst for solar-driven H 2 evolution, yet its performance is limited by rapid charge recombination and insufficient surface reduction sites. Herein, a vacancy-assisted strategy combining mild thermal treatment with in situ photodeposition is developed to construct highly dispersed metallic Cu species on TiO 2 (B) nanosheets. Calcination at 200 °C preserves the metastable TiO 2 (B) framework while generating an appropriate concentration of surface oxygen vacancies, which serve as preferential anchoring sites for Cu and promote strong electronic coupling at the Cu-TiO 2 (B) interface. Under air mass 1.5 simulated sunlight with methanol as a sacrificial agent, the optimized Cu-loaded TiO 2 (B) sample treated at 200 °C achieves an H 2 evolution rate of 7.92 mmol g -1 h -1 and retains stable activity over five consecutive cycles. Comprehensive structural and spectroscopic characterizations, together with first-principles calculations, demonstrate that oxygen-vacancy-mediated Cu anchoring strengthens metal-support electronic coupling, promotes directional charge transfer and carrier separation, and facilitates interfacial proton reduction. These results establish a mechanistic correlation among phase preservation, oxygen-vacancy regulation, Cu dispersion, and photocatalytic performance. This work provides a practical and cost-effective strategy for constructing efficient non-noble-metal interfaces on metastable oxide photocatalysts. Download: Download high-res image (204KB) Download: Download full-size image A mild defect-engineering strategy preserves the TiO 2 (B) framework while generating oxygen vacancies that stabilize highly dispersed metallic Cu species. The resulting Cu-Vo interfaces promote directional electron transfer, suppress charge recombination, and facilitate interfacial proton reduction, thereby enhancing photocatalytic H 2 evolution under AM 1.5 simulated sunlight.
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DOI
高影响因子
NANOTECHNOLOGY
·
2024
·
IF 2.9
Mewin Vincent,Venkata Sai Avvaru,Maciej Haranczyk,Vinodkumar Etacheri
Although Mg-Li dual metal-ion batteries are proposed as a superior system that unite safety of Mg-batteries and performance of Li-ion based systems, its practical implantation is limited due to the lack of reliable high performance cathodes. Herein, we report a high-performance Mg-Li dual metal-ion battery system based on highly pseudocapacitive hierarchical TiO2-B nanosheet assembled spheres (NS) cathode. This 2D cathode displayed exceptional pseudocapacitance (a maximum of 93%) specific capacity (303 mAh/g at 25 mA/g), rate performance (210 mAh/g at 1A/g), consistent cycling (retain ~100% capacity for 3000 cycles at 1A/g), coulombic efficiency (nearly 100%) and fast-charging (~12.1 min). These properties are remarkably dominant to the existing Mg-Li dual metal-ion battery cathodes. Spectroscopic and microscopic mechanistic studies confirmed negligible structural changes during charge-discharge cycles of the TiO2-B nanosheet assembled spheres electrodes. Exceptional electrochemical properties of the 2D electrode is ascribed to remarkable pseudocapacitive Mg-Li dual metal-ion diffusion via the numerous nanointerfaces of TiO2-B caused by its hierarchical microstrucrure. Large surface area, nanosheet morphology, mesoporous structure and ultrathin nature also acted as secondary factors facilitating improved electrode-electrolyte contact. Demonstrated approach of pseudocapacitive type Mg-Li dual metal-ion intercalation through hierarchical nanointerfaces may be further utilized for the designing of numerous top-notch electrode materials for futuristic Mg-Li dual metal-ion batteries
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jun Dai,Juan Yang,Xiaohan Wang,Lei Zhang,Yingjie Li
Wirelike catalysts of mixed-phase TiO 2 (B)/anatase TiO 2 , bare anatase TiO 2 and TiO 2 (B) are synthesized via calcining precursor hydrogen titanate obtained from hydrothermal process at different temperatures between 450 and 700 °C. Under visible light irradiation, mixed-phase TiO 2 (B)/anatase TiO 2 catalysts exhibit enhanced photocatalytic activity in comparison with pure TiO 2 (B) and anatase TiO 2 toward selective oxidation of benzylamines into imines and the highest photocatalytic activity is achieved by TW-550 sample consisting of 65% TiO 2 (B) and 35% anatase. The difference in photocatalytic activities of TiO 2 samples can be attributed to the different adsorption abilities resulted from their crystal structures and interfacial charge separation driven by surface-phase junctions between TiO 2 (B) and anatase TiO 2 . Moreover, the photoinduced charge transfer mechanism of surface complex is also proposed over mixed-phase TiO 2 (B)/anatase TiO 2 catalysts. Advantages of this photocatalytic system include efficient utilization of solar light, general suitability to amines, reusability and facile separation of nanowires catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Dandan Fang,Xiangqin Zheng,Huan Yi,Hong Dai,Zhensheng Hong,Yiru Peng,Yanyu Lin
A highly sensitive electrochemiluminescence (ECL) immunosensor was fabricated for the quantitative analysis of deoxynivalenol (DON) based on an effective all-in-one bioprobe that composed of TiO 2 -B with Fluoro-coumarin silicon phthalocyanine (F-couSiPc) and luminol. Herein, TiO 2 -B with large specific area was served as a favorable carrier, greatly increased the loading of enhancer F-couSiPc and luminophore luminol, resulting in the tremendous enhancement of ECL signal. Specifically, F-couSiPc as coreaction accelerator could facilitate the decomposition of dissolved O 2 to generate substantial reactive oxygen species (ROS) to participate in the ECL reaction of luminol. Additionally, the prepared PEDOT/HA@mp MnO 2 was employed as the sensing platform of biosensor, which can not only capture substantial antibody to improve the sensitivity, but also could expedite the electronic transmission rate to make the ECL intensity further amplified. Ultimately, the proposed immunosensor presented favorable performance for the determination of DON, such as high sensitivity, good stability, wide liner range (from 1.0*10 −6 ng/mL to 10 ng/mL) and a low detection limit of 3.3*10 -7 ng/mL.
研究领域:
分析化学
·
食品安全检测
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·
IF 2.8
Yin Cheng,Qian Jing,Guo Tao,Wang Liqiang
In order to photocatalytic degradation of ethylene in environmental pollution, TiO 2 (B) featuring a multiphase crystal structure was first synthesized via hydrothermal synthesis method. The efficiency of photocatalytic degradation of ethylene and methyl orange by TiO 2 (B) was up to 49.23% and 60%, respectively, and the specific surface area of TiO 2 (B) was as large as 277.69 m 2 /g. Subsequently, photocatalytic films loaded with the TiO 2 (B) were produced using an extrusion casting machine coupled with a twin-screw extruder. The mechanical properties and barrier property to oxygen were enhanced by adding 1% TiO 2 (B) to photocatalytic films. The hydrophilicity of the photocatalytic films and the decrease in contact angle confirmed the existence of the ‘Honda-Fujishima effect’. The highest degradation efficiency of methyl orange and ethylene by the photocatalytic film could reach 9% and 7.79%, respectively. Both TiO 2 (B) and photocatalytic films showed good antibacterial properties against Escherichia coli and Staphylococcus aureus . TiO 2 (B) and photocatalytic films have been shown to have excellent photocatalytic degradation performance of organic compounds.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2024
·Vol. 14
·期 6
·1568-1578
·
IF 4.4
Qifeng Chen,Peng Zheng,Haodi Liu,Yuanrong Zhang,Shuaitao Li,Hongpian Guo,Yanfen Fang,Xun Hu,Ran Duan
The combination of photocatalytic dehalogenation of halogenated aromatics and C–C coupling synthesis of valuable organics is an interesting method for the elimination of pollutants and synthesis of valuable chemicals. Herein, we present a green method for the photocatalytic dehalogenation of benzyl bromide and selective coupling synthesis of bibenzyl achieved on the dual active sites of single-atom Cu and surface oxygen vacancies (VOS) generated in situ on ultrathin 2D-TiO2(B) nanosheets. The experimental results show that single-atom Cu sites on ultrathin TiO2(B) nanosheets can improve charge transfer and separation efficiency and stabilize VOS formed in situ; the presence of VOS not only improves light absorption capacity but also favors the adsorption of reactant benzyl bromide molecules. More importantly, the dual sites of single-atom Cu and adjacent VOS form a solid frustrated Lewis pair, favor the adsorption of benzyl bromide molecules, activate the C–Br bond, and boost the C–C coupling synthesis of bibenzyl. This work provides a novel insight into photocatalytic C–C coupling through the synergistic effect of single-atom Cu and VOS on ultrathin nanosheet photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）