ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Juan Wu,Mixiang Qi,Gang Wang,Bin Yu,Chengdong Liu,Wei Hou,Weisheng Liu
A passivation layer plays an important role in suppressing charge recombination on surface trap states. However, the effect of a single passivation layer is limited. Building a passivation system containing multiple passivation layers with different functions for efficient charge separation presents a challenge. In this study, we demonstrate the synergistic passivation effect between a metal–organic framework-derived TiO2 nanoparticle layer and an ultrathin carbon layer, which facilitates the charge separation of an α-Fe2O3 photoanode with a surface separation efficiency of 57%. The α-Fe2O3/TiO2/C photoanode generates a photocurrent of 1.93 mA cm–2 at 1.23 V vs a reversible hydrogen electrode, which is about 3.22 times higher than that of pristine α-Fe2O3. After the introduction of the cocatalyst β-FeOOH onto the α-Fe2O3/TiO2/C photoanode, a higher photocurrent of 2.95 mA cm–2 is generated under the same condition without doping and constructing a heterojunction.
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DOI
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Wei Yuan,Zhen Zhang,Xiaoling Cui,Huarong Liu,Chen Tai,Yuanrui Song
Hollow mesoporous CdS@TiO2@Au microspheres as a photocatalyst have been successfully synthesized by γ-irradiation deposition of Au nanoparticles (NPs) on the double shell of hollow CdS@TiO2 microspheres, which are prepared via the “hard core template” approach combining with calcination and solvothermal reaction. The morphology, structure, and properties of the as-prepared hybrid photocatalyst have been characterized by TEM, XRD, XPS, N2 adsorption–desorption, UV–vis DRS, PL, and photoelectrochemical measurements. The results show that the hollow mesoporous double-shell structure is formed with a fluffy TiO2 coating on the surface of the CdS shell composed of stacked CdS NPs. This ternary hybrid photocatalyst exhibits excellent photocatalytic activity for hydrogen evolution and stability under visible-light illumination, which is attributed to the unique ternary hollow mesoporous double-shell heterostructure that may extend the light responsive region, enhance the light-harvesting efficiency, prevent the direct contact between the CdS shell and O2 and H2O, facilitate mass transfer, reduce the recombination rate of charge carriers, and promote the efficiency of water splitting H2 evolution ultimately. The photocatalytic hydrogen generation rate (1720 μmol·g–1·h–1) of the hollow CdS@TiO2@Au microspheres is 2.37 and 12.7 times higher than those of hollow CdS@TiO2 and CdS microspheres, respectively. The loading amount of Au NPs also influences the photocatalytic hydrogen evolution activity of the ternary photocatalyst. Our work expands the application of hybrid hollow microsphere photocatalysts in photocatalytic hydrogen generation by the rational design for enhancing photocatalytic activity under visible light.
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Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 124
·期 2
·587-601
·
IF 1.515
Wang Tao,Zhang Xinyu,Liu Jun,Liu Hanzi,Sun Baomin
NO conversion using dielectric barrier discharge (DBD) plasma with different catalysts was investigated. Cu/TiO 2 , Cu/Al 2 O 3 , Cu/ZSM-5, Cu/CNTs and Cu/AC catalysts were prepared by incipient wetness impregnation with 4 wt% Cu loaded. BET, SEM, XRD, XPS, H 2 -TPR, NH 3 -TPD were used to measure and evaluate various catalysts. Compared with the plasma only process, the combination of plasma with different catalysts significant improved the NO conversion rate. The highest NO conversion rate of 76% could be achieved with Cu/ZSM-5 catalyst at the energy density of 184 J/L. The results indicate that Cu species over the support ZSM-5 can produce high concentrations of CuO, largest specific surface area, largest amounts of acidity and lowest reduction temperature (209 °C), these factors conducive to plasma-catalyst reaction. Besides, Cu/TiO 2 and Cu/Al 2 O 3 catalysts exhibited excellent NO conversion at the low energy density because of the low thermal stability. After plasma-catalyst reaction, the reducibility of CuO and Cu 2 O over supports decreased and the peak position of acid sites shifted to lower temperature.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 11
·6953-6964
·
IF 4.186
Yuchao Qiu,Junjie Shi,Bin Yu,Changle Hou,Jingjing Dong,Song Li,Yumo Zhai,Jianzhong Li,Changsheng Liu
The recycling of titanium from titania-bearing slag is an important part of the circular economy; however, the yield of titania is restricted due to the lack of fundamental thermodynamic data. In the present work, the equilibrium phase relations of MgO–Al 2 O 3 –TiO 2 system in air at 1600°C have been determined using a high-temperature equilibration-quenching technique followed by X-ray photoelectron spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectrometry, and X-ray diffraction. Ti 4+ was confirmed as the stable valence of titanium, and the rutile and spinel solid solution phases were detected to be coexisting with pseudobrookite solid solution phase, respectively. The formation principles of pseudobrookite and spinel solid solutions were confirmed in view of the corresponding crystal structure and the composition substitution relationship of the oxides at 1600°C. However, great discrepancies were found from the comparison of the present experimental results with the thermodynamic calculations and the literature results, and the present equilibrium phase relations are therefore significant for updating the present titania related thermodynamic database for a superior prediction of the thermodynamic behaviors of relevant process.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qingqing Lang,Yaohan Chen,Tianlong Huang,Lining Yang,Shuxian Zhong,Lanju Wu,Jianrong Chen,Song Bai
The integration of plasmonic metal with wide-bandgap semiconductor is a promising approach to utilize the visible light without compromise of the redox ability of photogenerated charge carriers. However, a larger work function of metal than that of semiconductor is indispensable to enable the injection of hot electrons from plasmonic metal to semiconductor. In this paper, we demonstrated that reduced graphene oxide (rGO) nanosheets as conductive “bridge” can breakthrough the restriction and transfer hot electrons from Ag of smaller work function to TiO 2 of larger work function. In the design, both of the Ag nanocubes and TiO 2 nanosheets are co-deposited on the surface of rGO nanosheets to form Ag-rGO-TiO 2 structure, which was characterized by XRD, TEM, Raman and XPS spectra. On one hand, the Ag-rGO interface facilitates the transfer of hot electrons from Ag to rGO through conductor–conductor contact. On the other hand, the new formed Schottky junction on the rGO-TiO 2 interface further pumps the transferred electrons to the surface of TiO 2 for photocatalytic reduction reaction resulted from the larger work function of rGO than that of TiO 2 . Enabled by this unique design, the hydrogen production activity achieved under visible light irradiation is dramatically enhanced in comparison with that of Ag-TiO 2 counterpart with the direct contact between the same Ag nanocubes and TiO 2 nanosheets. This work represents a step toward the rational interfacial design of plasmonic metal-semiconductor hybrid structures for broad-spectrum photocatalysis.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongying Cheng,Song Liu,Cuiying Hu,Hongxia Wang
A novel flower-like film composed of uniform hollow TiO 2 -NH 2 nano-shell (HTNs), luminol and aniline was synthesized by electro-copolymerization method in acidic ionic liquid EmimCl (IL, 1-ethyl-3-methylimidazolium chloride). The surficial morphology of the film was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED) and atomic force microscope (AFM), which showed the polycrystalline property. Its copolymerization mechanism was discussed in detail, which presented symmetric arrangement. The most obvious multiple increase of peak current in CV indicated the conjugate of HTNs in luminol structure and in aromatic ring skeleton. This film with excellent electrocatalysis performance used for nonelectroactive acetochlor (ACT) detection showed the lowest catalytic potential. Some important parameters were optimized for a homogeneous film and for a sensitive detection. On the optimum film, the electrocatalysis sensor exhibited a linear response within the concentration range of ACT from 2.0×10 −7 M to 1.5×10 −5 M, and an absolute detection limit of 0.15×10 -9 M at a signal-to-noise ratio of 3. Then the proposed method was used for the detection of ACT residue in the real strawberry sample with good results. The promising sensor presents good reproducibility and stability, providing a new fast and sensitive method for the analysis of real samples in environment.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Li Xiaoliang,Feng Jiangjiang,Sun Jia,Wang Zhe,Zhao Wei
TiO 2 (P25)-supported Au-Pd bimetal nanoparticles displayed excellent performance in the solvent-free benzyl alcohol catalytic oxidation. However, little research attention has been paid to investigate the effects of TiO 2 form on the catalytic activity of Au-Pd/TiO 2 . In the present research, rutile, brookite, and anatase TiO 2 were successfully synthesized and subsequently applied as the carrier to load Au-Pd nanoparticles by the deposition-precipitation method. The experimental results indicated that the benzyl alcohol conversion employing the rutile TiO 2 -supported Au-Pd catalyst is higher than the conversion of anatase and brookite TiO 2 -loaded Au-Pd catalysts. However, the Au-Pd/TiO 2 -rutile displayed the lowest and highest selectivity toward benzaldehyde and toluene, respectively. ICP-AES, XRD, XPS, and TEM were conducted to characterize these catalysts. The corresponding experimental results revealed that the excellent performance of Au-Pd/TiO 2 -rutile catalyst was attributed to both the smaller Au-Pd nanoparticle size distribution and the higher concentrations of O α and Pd 2+ species on the catalyst surface. In the recycle experiments, the Au-Pd/TiO 2 -rutile catalyst displayed lower reaction stability compared with the Au-Pd/TiO 2 -anatase and Au-Pd/TiO 2 -brookite, which might be due to the coverage of larger amount of aldehyde products on the surface.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 7
·1-12
·
IF 2.8
Yin Lixiong,Guo Yao,Liu Changqing,Li Luyao,Fan Dejiang,Huang Jianfeng,Zhang Qinghua,Wang Tao,Chen Yufei
Carbon-based organic-inorganic perovskite solar cells (C-PSCs) are low-cost photovoltaic cells. However, the carrier recombination caused by interface defects and the mismatched interface energy level limits the further improvement of the efficiency of C-PSCs. In this work, SmCl 3 was introduced as a “double-sided” modifier to achieve interfacial modification. After modified, Cl − passivated the oxygen vacancy defects on the TiO 2 surface. Meanwhile, Sm 3+ was diffused into the perovskite interface in the form of a concentration gradient, which balanced the non-coordinated Pb 2+ and improved the energy level arrangement. Due to good interfacial contact, the reduced interfacial non-radiative recombination, and rapid charge extraction and transport, the optimized C-PSCs efficiency was increased from 11.03 to 13.4%. In addition, the unencapsulated champion PSC remained stable for long-term stability after the sustained attack for 800 h at room temperature of 20% RH. This work proposed a straightforward interface modification strategy to improve the efficiency of C-PSCs.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 9
·1-11
·
IF 2.101
Feng Lu,Jiang Heng,Zou Mingming,Xiong Fengqiang,Ganeshraja Ayyakannu Sundaram,Pervaiz Erum,Liu Yinan,Zou Shunying,Yang Minghui
Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microsphere photocatalysts are prepared by a simple sol–gel method with controllable sizes in the range of 400–500 nm and high surface area of 112 m 2 g −1 . Manganous acetate is the Mn source, and ammonia gas is the nitrogen source used. The dopants are found to be uniformly distributed in the TiO 2 matrix. Interestingly, in (Mn,N)-co-doped TiO 2 , we observe an effective indirect band gap of ~2.58 eV. (Mn,N)-co-doped mesoporous TiO 2 microspheres show higher photocatalytic activity than Mn–TiO 2 microspheres under visible light irradiation. Among the samples reported in this work, 0.2 at.% Mn doping and 500 °C 2-h nitriding condition give the highest photocatalytic activity. The observed photocatalytic activity in the (Mn,N)-co-doped TiO 2 is attributed to the contribution from improved absorption due to trap levels of Mn, oxygen vacancies and N doping. Graphical Abstract Manganese- and nitrogen-co-doped mesoporous TiO 2 microspheres containing substitutional N, interstitial N and O vacancies show high visible light photocatalytic activity.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Lei Cui,Siliang Liu,Fangke Wang,Jingyao Li,Yanhua Song,Ye Sheng,Haifeng Zou
In this work, uniform g-C 3 N 4 shells have grown on the surface of electrospinning TiO 2 nanofibers to form one dimensional core/shell structured TiO 2 /g-C 3 N 4 nanofibers by a facial melamine-involved vapor deposition approach. During the heat treatment process in a simple setup, the TiO 2 nanofibers served as supports to prevent the collapses and aggregations of g-C 3 N 4 while forming heterojunctions with g-C 3 N 4 at the interface. The as prepared heterogeneous TiO 2 /g-C 3 N 4 photocatalyst exhibited remarkably enhanced visible light photocatalytic activity for RhB degradation by maxing heterojunctions at the core/shell interface. The photodegradation reaction rate constant of the obtained heterojunction is 0.064 min −1 , which is 4.0 times that of pure g-C 3 N 4 (0.016 min −1 ). To reach higher RhB degradation efficiency (>90%), TiO 2 /g-C 3 N 4 shortened the irradiation time by 60 min compared with individual components (pure g-C 3 N 4 or TiO 2 nanofibers). The remarkably high photocatalytic performances are mainly ascribed to the synergetic effect of efficient photogenerated charge separation properties and decreased electron transfer resistance of the heterojunctions formed between g-C 3 N 4 and TiO 2 . We believe the proposed simple method and setup is an attractive strategy for constructing one dimensional g–C 3 N 4 –based nano-heterojunctions with excellent photocatalytic properties.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6543-6549
·
IF 3.591
Ziqi Zhang,Xiang Ni,Kaida Yao,Siqi Zhang,Yang Liu,Yueqiu Sun,Xiangzhi Wang,Weimin Huang,Yan Zhang
Titanium has been applied to implants over the last decades due to its excellent biocompatibility and mechanical properties. However, there are still some drawbacks for titanium and its alloys to overcome. Thus, in this study, a novel electrochemical synthesis process has been developed to fabricate TiO2 nanotube array, hydroxyapatite and rare-earth (La3+) doped ZIF-8 nanoparticle composite coating, which can enhance the antibacterial and anti-corrosion property on the premise of minimizing the biocompatibility loss of titanium implants. Compared with traditional processing methods, electrochemical machining is more time-saving, energy-saving and environment-friendly. Thus, it provides an alternative way to produce medical implants.
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ACS Nano
·
2025
·
IF 16
Qianyi Cheng,Chuyue Qiao,Yu Chen,Shaopeng Fu,Jianxian Zhou,Xiangyu Chen,Zhixun Wang,Jianfeng Li,Lei Wei,Qichong Zhang
The development of high-performance blue-light-sensitive photodetectors for underwater applications faces significant challenges due to the limited absorption range and inefficient charge separation in conventional semiconductor materials. Here, we design a TiO2@CdS core–shell heterojunction that synergistically combines the advantages of both materials, significantly enhancing blue-light absorption (450–495 nm) and charge carrier separation efficiency. The resulting fiber-shaped photoelectrochemical photodetector (FPPD) displays exceptional performance with a high responsivity of 101.87 mA W–1, fast response time of <19 ms, and outstanding mechanical flexibility. Furthermore, our FPPD exhibits biomimetic synaptic functionalities including bilingual responses, short-term plasticity, and low energy consumption comparable to that of biological synapses, enabling neuromorphic information perception and computing capabilities. Practical applications in underwater optical communication, imaging, and human–machine interaction are successfully demonstrated, highlighting the FPPD’s versatility in underwater environments. This work not only advances the design of high-performance underwater optoelectronic devices but also establishes a direct connection between traditional photodetection and emerging neuromorphic computing, laying the groundwork for innovative underwater systems and wearable technologies.
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