Surfaces and Interfaces
·
2021
·
IF 4.837
Qianxiao Zhang,Donghai Chen,Qi Song,Changjian Zhou,Di Li,Dan Tian,Deli Jiang
Introduction of surface oxygen vacancies is an efficient strategy to enhance the photocatalytic activity of metal oxides by inhibiting the recombination of photogenerated hole and electrons. However, owing to limited exposed surface, maximizing the concentration of oxygen vacancies is still challenging. Herein, utilizing a sacrificial template strategy, unique 2D holey defective TiO 2 nanosheets (HD-TiO 2 NSs) with abundant oxygen vacancies are synthesized for water splitting. This HD-TiO 2 NSs consisting of a large number of interconnected TiO 2 nanopartices possess a large number of mesopores , rendering the facile generation of abundant oxygen vacancies. The resulting HD-TiO 2 NSs photocatalyst exhibited excellent hydrogen production activity with rate of 8.99 mmol•g –1 •h –1 under solar light irradiation, which is 2.83 and 26.8 times higher than those of H-TiO 2 NSs catalyst and defected TiO 2 bulk counterpart, respectively, and ranks in the highest photocatalytic activities of the reported defective TiO 2 photocatalysts. This work demonstrates an efficient strategy to enhance the photocatalytic activity by engineering defect and special 2D holey nanostructure .
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Aleksei Chalgin,Wenlong Chen,Qian Xiang,Yi Wu,Fan Li,Fenglei Shi,Chengyi Song,Peng Tao,Wen Shang,Jianbo Wu
The urgent need of catalysts with improved performances toward the hydrogen evolution reaction (HER) is still one of the crucial issues for the water splitting electrocatalysis. Herein, we exhibit that the HER activity of the Pd nanocubes could be improved by selecting the appropriately shaped titania nanocrystals as support. In particular, we used Pd nanoparticles with (100)-facet exposed to show that the HER performance of Pd cubes can be improved in both acidic and alkaline electrolyte media when combined on the anatase TiO2 nanocrystals. Furthermore, we have also investigated the facet effect of TiO2 on the performance in detail, which indicated stronger catalytic activity when (001)-TiO2 was used rather than (mix 101/001)-TiO2 and (101)-TiO2. The electron-transfer-induced improvement of HER activity of Pd/TiO2 was assessed by electron energy loss spectroscopy (EELS). Thereafter, the combined support materials with suitable facet exposed can give an additional adjusting path to regulate the HER activities of Pd nanocatalysts, which henceforth can further contribute to a novel way for tuning other catalysts with good electrocatalytic properties.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·096509
·
IF 4.316
Guohua Dong,Kun Lang,Dong-Feng Chai,Wenzhi Zhang,Ming Zhao,Lili Sui,Jialong Zhong,Xinyu Jin,Yitong Fan
A Ti/CoTiO3-TiO2 catalyst electrode was successfully prepared by a one-step impregnation pyrolysis method and systematically investigated through scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The electrochemical characterization results containing cyclic voltammetry, electrochemical impedance spectroscopy, and linear sweep voltammetry further indicate that the as-prepared Ti/CoTiO3-TiO2 has higher oxygen evolution potential, lower resistance, higher electrochemical active surface area, and a longer lifetime than that of the pristine Ti/TiO2. A variety of dyes were selected as the target degraded pollutants for evaluating the electrocatalytic performance of Ti/CoTiO3-TiO2. Compared with those of the Ti/TiO2 and other counterparts, the Ti/CoTiO3-TiO2 shows significantly higher degradation efficiency, up to 98.5% under optimal conditions. Moreover, the Ti/CoTiO3-TiO2 displays superior stability and reusability. The higher electrochemical activity of Ti/CoTiO3-TiO2 than Ti/TiO2 may be the main reason for electrocatalytic performance enhancement, and the numerous ·OH and O2− radicals generated on the anode surface may be the primary active species for dyes degradation. In addition, the possible degradation mechanism was inferred by analyzing the measured intermediates. Consequently, this work offers a strategy via constructing titanate composites to enhance the electrocatalytic degradation performance for the refractory organic pollutants.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Zhixuan Huang,Kaifeng Yu,Doudou Wang,Ye Zhang,Lili Li,Ce Liang
Herein, a facile way was reported for fabrication of the anode nanocomposites with efficient lithium/sodium storage and excellent cycling stability. Iron phytate nanoparticles embedded in TiO 2 (IP/TiO 2 ) was prepared by coaxial electrospinning with the aid of PAN and PVP. N, P-doped Fe 2 P@TiO 2 core-shell carbon nanofibers (Fe 2 P@TiO 2 /CNF) was prepared after heat treatment. When Fe 2 P@TiO 2 /CNF were introduced as a self-supporting anode in lithium/sodium-ion batteries, Fe 2 P core supplied high energy density , and N, P-doped carbon fiber could induce the structural defects, facilitate electron transport and improve electrical conductivity . Moreover, TiO 2 shell inhibited volumetric expansion and pulverization of Fe 2 P core and improved the cycling stability of the anode. The Fe 2 P@TiO 2 /CNF electrode exhibited a large reversible capacity (LIB: 1175.7 and SIB: 519.8 mAh g −1 ), excellent cycling ability and outstanding rate performance. As anode in LIBs for Fe 2 P@TiO 2 /CNF, capacitance and diffusion control played important roles in Li + intercalation and deintercalation, simultaneously. When Fe 2 P@TiO 2 /CNF anode was used in SIBs, capacitive control behavior occupied a major role and displayed outstanding electrochemical performance . This work offers a possibility for designing anode nanocomposite with outstanding capacity and cycling stability in lithium/sodium-ion batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Liang Dan,Hui Wang,Xiaobao Yang,Jiangwen Liu,Liuzhang Ouyang,Min Zhu
The practical applications of MgH2 as a high-density hydrogen carrier depend heavily on efficient and low-cost catalysts to accelerate the dehydriding/hydriding reactions at moderate temperatures. In the present work, this issue is addressed by synthesizing Nb-doped TiO2 solid-solution-type catalysts that dramatically improve the hydrogen sorption performances of MgH2. The catalyzed MgH2 can absorb 5 wt % of H2 even at room temperature for 20 s, release 6 wt % of H2 at 225 °C within 12 min, and the complete dehydrogenation can be achieved at 150 °C under a dynamic vacuum atmosphere. Density functional theory calculations reveal that Nb doping introduces Nb 4d orbitals with stronger interaction with H 1s into the density of states of TiO2. This considerably enhances both the adsorption and dissociation ability of the H2 molecule on the catalysts surface and the hydrogen diffusion across the specific Mg/Ti(Nb)O2 interface. The successful implementation of solid solution-type catalysts in MgH2 offers a demonstration and inspiration for the development of high-performance catalysts and solid-state hydrogen storage materials.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Jianqing Zhou,Qiancheng Zhu,Hao Hu,Wenjuan Chen,Ying Yu
Spinel Li 4 Ti 5 O 12 known as a “zero-strain” anode material for Li-ion battery has attracted much attention because of its superior safety and stability. Herein, we report a novel H 2 O 2 -assisted one-step hydrothermal method to synthesize different ratio Li 4 Ti 5 O 12 /TiO 2 composites with the same amount of raw materials. For the first time, Li 4 Ti 5 O 12 was prepared directly from commercial titania with the presence of H 2 O 2 , and different proportion Li 4 Ti 5 O 12 /TiO 2 composites were fabricated only by adjusting the amount of H 2 O 2 . The reaction mechanism of the novel H 2 O 2 -assisted method was clearly investigated, and H 2 O 2 plays a crucial role in the formation of intermediate Li 1.81 H 0.19 Ti 2 O 5 ·2H 2 O. Further, the electrochemical performance of different ratio Li 4 Ti 5 O 12 /TiO 2 composites have been investigated. This facile method is also applicable for the preparation of Na 2 Ti 6 O 13 /TiO 2 material, and provides us the new way to fabricate composite materials.
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高影响因子
Journal of Materiomics
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2015
·
IF 0
Junwei Fu,Shaowen Cao,Jiaguo Yu
Photocatalytic hydrogen generation is one of the most promising solutions to convert solar power into green chemical energy. In this work, a multi-component TiO 2 –Ag–Cu 2 O composite was obtained through simple impregnation-calcination of Cu 2 O and subsequent photodeposition of Ag onto electrospun TiO 2 nanotubes. The resulting TiO 2 –Ag–Cu 2 O photocatalyst exhibits excellent photocatalytic H 2 evolution activity due to the synergetic effect of Ag and Cu 2 O on electrospun TiO 2 nanotubes. A dual Z-scheme charge transfer pathway for photocatalytic reactions over TiO 2 –Ag–Cu 2 O composite was proposed and discussed. This work provides a prototype for designing Z-scheme photocatalyst with Ag as an electron mediator.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Chongyi Li,Feng Xue,Enyong Ding,Xiaoling He
A unique organic–inorganic hybrid nanocomposite was designed and synthesized by chemically anchoring the cationic collagen-based derivatives onto the surface of Fe 3+ /TiO 2 nanospheres for the significant enhancement in photocatalytic activity under the visible light irradiation. The NMR analysis suggested the successful fabrication of cationic collagen-g-PDMC as grafted materials. In addition, the chemical structures, morphologies and properties of these samples were systematically characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Raman spectrum, ultra violet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). And obtained results clearly demonstrated that Fe 3+ ions diffusing into TiO 2 lattice could be responsible for slightly reducing the average diameter of nanospheres to about 125 nm, promoting phase transition from anatase to rutile to some extent and extending the light harvesting range into visible region markedly. Meanwhile, the achievement that collagen-g-PDMC molecules had been covalently immobilized onto the surface of Fe 3+ /TiO 2 nanoparticles was also well supported by the information acquired. Furthermore, the photocatalytic activities of all the as-prepared products were carefully evaluated by adopting photocatalytic decoloration of methyl orange (MO) solution under the solar direct irradiation, and the sample CFT-3 performed the best in the photocatalytic degradation process, which was mainly attributed to the energetic synergistic effect brought about by Fe 3+ ions doping and collagen-g-PDMC molecules immobilized on the surface.
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高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Zhimin Ren,Chao Chen,Xinxin Fu,Jia Wang,Chenyao Fan,Guodong Qian,Zhiyu Wang
Anatase TiO 2 /C composites nanorods were prepared via a simple internal-reflux approach under atmospheric pressure and subsequent carbonization. The oleic acid, which was used as the surfactant and carbon source, played an important role in synthesis and carbonization process. The TiO 2 /C nanorods prepared have high surface area and mesoporous structure, which are ascribed to the small diameter (2–4 nm) of nanorods and in situ formation of amorphous carbon , and both of those characters can improve the electrochemical property of TiO 2 /C electrode. The nanorods exhibit a high reversible capacity and improved capacity retention. The initial discharge capacity of TiO 2 /C composites is 411 mAhg −1 and still remains about 164.2 mAhg −1 after 50 cycles at a current of 177 mAg −1 , when used as anode materials for lithium ion batteries .
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高影响因子
CURRENT APPLIED PHYSICS
·
2022
·
IF 2.856
Yuchen Fei,Xiaofang Ye,Aseel Shaker Al-Baldawy,Jing Wan,Jinshen Lan,Jingtian Zhao,Ziyun Wang,Shanzhi Qu,Rongdun Hong,Shengshi Guo,Shengli Huang,Shuping Li,Junyong Kang
Noble metal particles have been embedded in semiconductors to improve photocatalysis efficiently, but the high cost made this approach difficult to apply widely in industry. Herein titanium dioxide/reduced graphene oxide (TiO 2 /rGO) nanowires in a core-shell structure were prepared. The physicochemical properties and photocatalytic performance of the specimen were characterized in comparison with TiO 2 and TiO 2 /Pt nanowires. The rGO layer and Pt nanoparticles increased chemical states of the components, reduced bandgap energy of the nanowires, enhanced visible light absorption , improved conductance and capacitance significantly. The methylene blue as catalyzed by TiO 2 /Pt and TiO 2 /rGO nanowires was degraded to 7.9% and 8.4% in an hour, but retained 25.7% by the TiO 2 nanowires. The properties and function of TiO 2 /rGO nanowires were close to those of TiO 2 /Pt nanowires, while the rGO price was much lower than that of Pt, which was of great significance for the photocatalytic application of TiO 2 heterojunction materials in industry.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Huiqing Wu,Yuejun Liu,Long Mao,Chunhai Jiang,Jiaming Ang,Xuehong Lu
To prepare an ultrafiltration membrane with simultaneous self-cleaning and self-protection abilities, TiO 2 -polydopamine (PDA) nanohybrid are facilely prepared and used to functionalize polysulfone (PSf) membrane matrix. In the TiO 2 -PDA nanohybrid , PDA spheres acts as an adhesive substrate to hold densely covered photocatalytic TiO 2 nanoparticles , and also serves as a free-radical scavenger to protect PSf membrane against the damage by free radicals produced by TiO 2 during UV exposure treatment. The spherical-shaped TiO 2 -PDA can be easily doped into PSf membrane via phase inversion method, which allows the hydrophilic TiO 2 -PDA spheres migrating to the hydrophobic PSf surface and benefiting the antifouling ability. As a result, the TiO 2 -PDA/PSf hybrid membrane exhibits excellent overall performances in separation efficiency, remarkable self-cleaning property and performance stability under UV irradiation, in comparison with PSf and TiO 2 /PSf membrane. The influence of TiO 2 -PDA content on the membrane properties is also investigated, and it is found the hybrid membrane with 0.8 wt% TiO 2 -PDA possesses the optimal performance.
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高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2019
·Vol. 31
·期 39
·395403
·
IF 2.711
Fang Liu,Zhaohui Dong,Lijia Liu
Nanostructured anatase TiO2 undergoes pressure-induced phase transformation, and the transformation sequence is significantly different from the bulk counterpart. The size and the morphology are found both playing a critical role in the phase transformation behavior. In this work, we prepare anatase TiO2 microspheres using a hydrothermal method. By controlling the reaction time, hollow and solid spheres of similar diameters are prepared. TEM and XRD analysis reveals that these microspheres are aggregates of anatase nanocrystalline of size between 15–16 nm. The phase transformation behaviour under high temperature is examined in situ using both Raman spectroscopy and synchrotron x-ray diffraction. We find that although both solid and hollow spheres are micron-sized, they undergo phase transformation sequence similar to nanomaterials with size of several tens of nanometers. Hollow spheres exhibit a higher compressibility than the solid spheres. A detailed analysis based on the formation mechanism of the spheres is performed to explain the unique phase transformation behavior of these materials.
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高影响因子
危险品化学品经营许可证（带存储）