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Wang W.,East China University of Science and Technology | Zhang J.,East China University of Science and Technology | Chen F.,East China University of Science and Technology | Anpo M.,Osaka Prefecture University | He D.,Shanghai National Engineering Research Center for Nanotechnology
Research on Chemical Intermediates | Year: 2010

Ag nanoparticles encapsulated by TiO2 shells have the ability to catalyze redox reactions on their surface. By continually monitoring by use of UV-visible spectroscopy it was found that the surface charge of both TiO 2-coated and uncoated colloidal silver particles changed after chemical electron injection. The charging and discharging process of Ag@TiO 2 vary, depending on the different Ag content of the core-shell nanoparticles. In order to enhance the stability of Ag@TiO2 colloids, Fe3+ was doped into the lattice of the TiO2 shells. The experimental results showed that the Fe3+ ions have the capacity to store and transfer electrons. Furthermore, the charging and discharging rate can be controlled by changing the thickness of the TiO2 shells, because they are limited by the diffusion distance of electrons through the TiO 2 shells. © Springer Science+Business Media B.V. 2010. Source


Yuan X.-L.,East China University of Science and Technology | Zhang J.-L.,East China University of Science and Technology | Anpo M.,Osaka Prefecture University | He D.-N.,Shanghai National Engineering Research Center for Nanotechnology
Research on Chemical Intermediates | Year: 2010

Fe3+ doped mesoporous TiO2 with ordered mesoporous structure were successfully prepared by the solvent evaporation-induced self-assembly process using P123 as soft template. The properties and structure of Fe3+ doped mesoporous TiO2 were characterized by means of XRD, EPR, BET, TEM, and UV-vis absorption spectra. The characteristic results clearly show that the amount of Fe3+ dopant affects the mesoporous structure as well as the visible light absorption of the catalysts. The photocatalytic activity of the prepared mesoporous TiO2 was evaluated from an analysis of the photodegradation of methyl orange under visible light irradiation. The results indicate that the sample of 0.50%Fe-MTiO2 exhibits the highest visible light photocatalytic activity compared with other catalysts. © Springer Science+Business Media B.V. 2010. Source


Li Y.-N.,Nanjing University of Technology | Xie Y.-Y.,Nanjing University of Technology | Wang J.,Shanghai National Engineering Research Center for Nanotechnology | Yang H.,Nanjing University of Technology
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

With lithium acetate and tetrabutyl titanate [Ti(OC 4H 9) 4] as starting materials, and PEG as a surfactant, anode material Li 4Ti 5O 12 for lithium-ion batteries has been prepared by a sol-gel method. The effects of the calcining temperature and calcining time on the electrochemical performance of obtained Li 4Ti 5O 12 were investigated. The results showed that using PEG6000 as surfactant, a single phase material with good crystallinity was obtained by calcining the gel precursors at 700°C in air for 10 h which exhibited the a narrow size distribution (100-380 nm). The nano-sized Li 4Ti 5O 12 power shows excellent rate capability. Its 1 st discharge capacities at 0.1 and 5C were 164 and 127 mAh/g, respectively, and could be retained at 162 and 120 mAh/g after 50 cycles. Source


Wang J.,Nanjing University of Technology | Wang J.,Shanghai National Engineering Research Center for Nanotechnology | Li Y.-N.,Nanjing University of Technology | Cheng X.-L.,Nanjing University of Technology | Yang H.,Nanjing University of Technology
Gongneng Cailiao/Journal of Functional Materials | Year: 2010

In situ carbon-coated Li4Ti5O12 composites were prepared by sol-gel route using citric acid and lauric acid as chelate agent and also carbon sources. The crystal structure, microstructure and electrochemical properties of samples were characterized by XRD, SEM, TEM, TG-DSC and galvanostatically charge-discharge experiments. The effects of the content of carbon sources on the phase structure, the microstructure and electrochemical properties were studied to optimize process. The sample prepared with citric acid to titanium molar ratio CTR=1:6 and lauric acid to titanium molar ratio LTR=1:20 was coated with a carbon layer of 5-10nm, exhibiting the best electrochemical performance. The carbon content of the sample was about 2.3wt%. Its discharge capacity at 1C rates can reach 151.1 mAh/g, respectively. After 50 cycles, fairly stable cycling performance was achieved without obvious capacity fade. Source

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