ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Jie Qu,Jacqueline E. Cloud,Yongan Yang,Jianning Ding,Ningyi Yuan
A one-step hydrothermal method, followed by calcination at 300 °C in an argon atmosphere, has been developed to synthesize TiO2-B nanoparticles/double-walled nanotubes (NP/DWNT) and TiO2-B nanoparticles/multiple-walled nanotubes (NP/MWNT). To the best of our knowledge, this is the first synthesis of TiO2-B NP/NT hierarchical structures. Both NP/DWNT and NP/MWNT show high performance as anode materials for lithium-ion batteries, superior to their counterparts of DWNT and MWNT, respectively. Among all the four materials studied herein, NP/DWNT demonstrates the highest discharge–charge capacity, rate capability, and cycling stability. The enhancement due to the NP loading results from the increased surface areas, the improved kinetics, and the decreased transport distance for both electrons and Li ions. The charge capacity at high rates lies in the intercalation pseudocapacitance originating from fast Li-ion transport through the infinite channels in TiO2-B. The superiority of DWNT materials versus MWNT materials is ascribed to the thinner walls, which provide a shorter distance for Li-ion transport through the radial direction.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18393-18403
·
IF 10.7
Fengjie Zhang,Wenhao Fang,Xiangkun Wu,Xingmei Lu
Currently, addressing the challenges posed by the low energy density of lithium titanate (LTO), a prevalent anode material in lithium slurry batteries (LSBs), is crucial for ensuring high stability, storage capacity, and cycle stability, thereby facilitating the commercialization of LSBs. In this study, a heterostructure (LTO-TOB) was created by integrating nano-TiO2(B) (bronze phase) onto the surface of commercial LTO. The coated TiO2(B) layer significantly increases the specific surface area and wettability, guaranteeing fantastic stability. The pseudo-capacitance lithium storage ability of TiO2(B) boosts the power of the electrochemical reaction. The extra interface in the crystalline phase and the presence of oxygen vacancies serve not just as lithium storage sites, but also accelerate the Li+ diffusivity and enhance the electron conductivity. Furthermore, the diffusion mechanism of lithium ions within LTO-TOB anolyte was examined by using a designed in situ Raman cell. The engineered LTO-TOB anolyte assembled reactor boasts a substantial specific capacity of 209.12 mA h g−1 at 0.5C, coupled with remarkable cycle steadiness (with a mere 0.095% capacity loss per 100 cycles). The reactor exhibits favorable electrochemical characteristics in both intermittent mode and static long-term cyclic mode, thereby highlighting the significance of surface heterostructure modification as a key approach in advancing the progress of LSBs.
研究领域:
材料科学
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电化学
·
电池技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 25
·4250-4259
·
IF 3.117
Xiaoxue Qi,Feng Shang,Tao Wang,Yuqin Ma,Yongsheng Yan
In recent years, photocatalytic degradation on inorganic semiconductors has been attracting widespread attention. However, for a single semiconductor, the speed of the recombination of electrons and holes is fast, which leads to a decrease in the absorption of sunlight, thereby affecting its photocatalytic efficiency. Therefore, the coupling of semiconductor and metal–organic framework is of great significance due to its porosity and large specific surface area. Herein, a composite photocatalyst was obtained by coupling ZIF-8 and TiO2(B) via a simple method. XRD, FT-IR spectroscopy, SEM, TEM, UV-visible diffuse reflectance spectroscopy, XPS, EPR and EDS were used to study the as-prepared samples. Photocatalytic degradation experiments confirmed that the composites have significantly improved photodegradation performance due to the increased light utilization and fast charge carrier transfer. Moreover, the possible mechanism of photodegradation was also proposed. This study provides an initial view on the coupling of semiconductor and metal–organic framework to enhance the photocatalytic performance.
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Nan Zhou,Yufan Wu,Yiran Li,Jiankui Yang,Qing Zhou,Yuwei Guo,Mao Xia,Zhi Zhou
As an anode with ultrahigh capacity (4200 mAh g −1 ), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO 2 ) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO 2 -B) has the more excellent electrochemical performance among the various crystalline of TiO 2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs . In this work, therefore, a Si@TiO 2 -B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g −1 under 0.1 A g −1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO 2 -B could increase the capacitive effects of the composite (68.75%).
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 22
·6987
·
IF 4.412
Yong Li,Yanfang Liu,Mingqing Zhang,Qianyu Zhou,Xin Li,Tianlu Chen,Shifeng Wang
Photocatalytic degradation, as an emerging method to control environmental pollution, is considered one of the most promising environmental purification technologies. As Tibet is a region with some of the strongest solar radiation in China and even in the world, it is extremely rich in solar energy resources, which is ideal for applying photocatalytic technology to its ecological environment protection and governance. In this study, Na2Ti3O7nanobelts were prepared via a hydrothermal method and converted to TiO2∙xH2O ion exchange, which was followed by high-temperature calcination to prepare TiO2(B) nanobelts (“B” in TiO2(B) means “Bronze phase”). A simple in situ method was used to generate Ag3PO4particles on the surface of the TiO2nanobelts to construct a Ag3PO4/TiO2(B) heterojunction composite photocatalyst. By generating Ag3PO4nanoparticles on the surface of the TiO2(B) nanobelts to construct heterojunctions, the light absorption range of the photocatalyst was successfully extended from UV (ultraviolet) to the visible region. Furthermore, the recombination of photogenerated electron–hole pairs in the catalyst was inhibited by the construction of the heterojunctions, thus greatly enhancing its light quantum efficiency. Therefore, the prepared Ag3PO4/TiO2(B) heterojunction composite photocatalyst greatly outperformed the TiO2(B) nanobelt in terms of photocatalytic degradation.Keywords:photocatalyst;heterojunction;photocatalytic degradation;TiO2(B) nanobelts
研究领域:
环境科学
·
材料科学
·
纳米技术
·
太阳能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shiha Huang,Bin Ya,Bingwen Zhou,Yunfeng Liu,Xingguo Zhang
The application of Fe-based amorphous microspheres in high-performance electromagnetic wave absorbing materials is significantly limited by a single loss mechanism. Utilizing interfacial engineering and magnetic-dielectric synergistic effect is a viable approach to enhance microwave absorption. In this work, FeSiBCuNbZr amorphous microspheres were synthesized using single copper roller melt-spinning method and ball mill method. The finding reveals that the incorporation of SiO 2 and TiO 2 (B) (bronze phase TiO 2 ) shells notably enhances polarization loss and conductive loss. FeSiBCuNbZr@SiO 2 @TiO 2 (B) amorphous composites exhibited a minimum reflection loss value of −64.89 dB at a thickness of 2.17 mm and an effective absorption bandwidth (EAB) of 8.08 GHz covering 9–18 GHz at a thickness of 1.9 mm. The exceptional wave absorption performance is ascribed to the combined effect of magnetic loss in the FeSiBCuNbZr amorphous core and dielectric loss from the double-shell structure, while maintaining favorable impedance matching. This work provides a new core–shell FeSiBCuNbZr amorphous composites for efficient electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuling Ma,Xiaojing Li,Yun Zhang,Li Chen,Jiangtao Wu,Daojiang Gao,Jian Bi,Guangyin Fan
The release of hydrogen from chemical hydrides is of significant importance for practical applications. In this study, Ru nanoparticles supported on TiO 2 (B) nanotubes , designated as Ru/TiO 2 (B), were synthesized and applied as catalysts for hydrogen evolution from the catalytic hydrolysis of ammonia borane (AB) at 25 °C. Results indicate that Ru/TiO 2 (B) shows high catalytic activity in hydrogen evolution from the hydrolysis of AB with an activation energy of 45.6 kJ mol −1 and a turnover frequency number of 303 mol H 2 ·(mol Ru·min) −1 . The Ru/TiO 2 (B) exhibits a total turnover number of 15,377 in catalytic lifetime measurement in hydrogen generation from the hydrolysis of AB before deactivation. The kinetic studies show that the hydrolysis of AB catalyzed by Ru/TiO 2 (B) is a first-order reaction with respect to Ru concentration, whereas it is a zero-order reaction regarding the AB concentration. The high catalytic activity of Ru/TiO 2 (B) demonstrates that TiO 2 (B) nanotubes are suitable media for nanoparticle immobilization.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245404
·
IF 3.953
Suyang Lu,Yunfan Shang,Wei Zheng,Yushuo Huang,Rui Wang,Wenwen Zeng,Haoran Zhan,Ye Yang,Jun Mei
With the increasing applications of Lithium-ion batteries in heavy equipment and engineering machinery, the requirements of rate capability are continuously growing. The high-rate performance of Li4Ti5O12 (LTO) needs to be further improved. In this paper, we synthesized LTO microsphere-TiO2(B) nanosheets (LTO-TOB) composite by using a solvothermal method and subsequent calcination. LTO-TOB composite combines the merits of TiO2(B) and LTO, resulting in excellent high-rate capability (144.8, 139.3 and 124.4 mAh g−1 at 20 C, 30 C and 50 C) and superior cycling stability (98.9% capability retention after 500 cycles at 5 C). Its excellent electrochemical properties root in the large surface area, high grain-boundary density and pseudocapacitive effect of LTO-TOB. This work reveals that LTO-TOB composite can be a potential anode for high power and energy density lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2023
·
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.
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
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·739-746
·
IF 3.591
Tao Wang,Xiqing Liu,Mei Liu,Runhua Liao,Hongquan Zhan,Xiaoxue Qi,Yongqing Wang,Yanju Huang
Black TiO2 and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO2(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO2(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO2(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe3+/Fe2+ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
Arabian Journal of Chemistry
·
2018
·
IF 2.969
Junyan Kuang,Zipeng Xing,Junwei Yin,Zhenzi Li,Siyu Tan,Meng Li,Jiaojiao Jiang,Qi Zhu,Wei Zhou
Ti 3+ self-doped rutile/anatase/TiO 2 (B) mixed-crystal tri-phase heterojunctions photocatalysts are fabricated via hydrothermal approach and mechanochemical process, followed by in-situ solid-state chemical reduction approach. The as-prepared samples are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The photocatalysts are consisted by anatase/rutile TiO 2 nanoparticles and 1D TiO 2 (B) single-crystalline nanorods, which form rutile/anatase/TiO 2 (B) tri-phase heterojunctions. The visible-light-driven photocatalytic degradation rates of methyl orange and phenol are up to ∼98 and 97%, which are 2.2 and 1.8 times higher than that of commercial Degussa P25, 2.3 and 2.2 times higher than that of pure TiO 2 (B) as well. The enhancement can be attributed to the synergistic effect of special nanostructure, tri-phase heterojunctions, oxygen vacancy and Ti 3+ self-doping, which facilitates the absorption of visible light and the spatial separation of photo-generated charge carriers. This work provides a new perspective for designing high-active visible-light-driven photocatalyst in future.
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
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xingmin Liu,Jianfeng Zheng,Kun Peng,Guozhen Qin,Yatao Yang,Zhanggen Huang
Constructing effective photocatalysts with visible-light-driven for degrading VOCs including formaldehyde remains a challenge. The TiO 2 (B) photocatalyst with a two-dimensional lamellar structure was prepared and modified by surface engineering. The DFT calculation results showed new impurity levels appeared among the energy bands of the modified TiO 2 (B) materials. These photocatalysts exhibited different rates of HCHO degradation under visible light. A variety of characterizations demonstrated that the surface defects greatly reduced the bandgap and enhanced the absorption of visible light. And the recombination of photogenerated electron-hole (e - -h + ) pairs was suppressed to varying degrees in the modulated TiO 2 (B) catalysts revealed in the photoelectrochemical analysis. It is necessary to match the band structure of photocatalysts with the frontier orbital of HCHO for achieving effectual photocatalytic oxidation (PCO). Remarkably, the separation and transport of photogenerated carriers were inhibited when excessive metal Cu was doped. The results in this work provide a deeper understanding of the relationship between the surface engineering of TiO 2 (B)-based catalysts and catalytic performance.
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
危险品化学品经营许可证（带存储）