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Wang L.-L.,Shanghai Second Polytechnic University | Shen L.,Shanghai Shanshan Technology Co. | Jin H.-Y.,Shanghai Second Polytechnic University | Zhu L.-P.,Shanghai Second Polytechnic University | Wang L.-J.,Shanghai Second Polytechnic University
Chinese Journal of Chemical Physics | Year: 2014

A facile impregnation method under mild condition is designed for synthesis of highly dispersed Pt nanoparticles with a narrow size of 4-7 nm on nitrogen-doped carbon nanotubes (CNx). CNx do not need any pre-surface modification due to the inherent chemical activity. The structure and nature of Pt/CNx were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy spectrum. All the experimental results revealed that the large amount of doped nitrogen atoms in CNx was virtually effective for capturing the Pt(IV) ions. The improved surface nitrogen functionalities and hydrophilicity contributed to the good dispersion and immobilization of Pt nanoparticles on the CNx surface. The Pt/CNx served as active and reusable catalysts in the hydrogenation of allyl alcohol. This could be attributed to high dispersion of Pt nanoparticles and stronger interaction between Pt and the supports, which prevented the Pt nanoparticles from aggregating into less active Pt black and from leaching as well. © 2014 Chinese Physical Society.

Zhao P.,CAS Xinjiang Technical Institute of Physics and Chemistry | Zhao P.,University of Chinese Academy of Sciences | Bian L.,CAS Xinjiang Technical Institute of Physics and Chemistry | Wang L.,CAS Xinjiang Technical Institute of Physics and Chemistry | And 4 more authors.
Applied Physics Letters | Year: 2014

Inorganic-organolead halide perovskite CH3NH3PbI3 modified BiFeO3 polycrystalline film has been established. The composite photoelectrode presents much larger open voltage and several magnitudes superior photoelectric conversion performance in comparison to the ordinary BiFeO3 polycrystalline film. The I-V curve shows that the short-circuit current (Jsc) is 1.74 mA·cm-2 and open-circuit voltage (Voc) is 1.62 V, the device's photon to current efficiency is over 1%. The large open voltage and high photovoltaic efficiency is believed to attributed to the spontaneous polarization of composite perovskite induced by BiFeO3 lattice and modified reduced work function of the modified BiFeO3 surface. Our results clearly show that the present BiFeO3-CH3NH3PbI3 planar device is capable to generate a large voltage in macro scale under visible light, leading an approach to further applications on photodetectors and optoelectronic switch. © 2014 AIP Publishing LLC.

Li H.,Shanghai Shanshan Technology Co. | Li H.,Shanxi Institute of Coal CAS Chemistry | Zhang B.,Shanxi Institute of Coal CAS Chemistry | Lu C.,Shanxi Institute of Coal CAS Chemistry
Materials Letters | Year: 2014

The graphene hydrogels (GHGs) could be prepared via hydrothermal process using graphene oxide (GO) hydrosol. However, the formation of GHGs is unavailable when the GO concentration is low. In this work, we successfully address this problem with the aid of some organic solvents such as tetrahydrofuran, acetone and ethanol. The as-obtained GHGs have different mesopore structure and interior microstructure depending on the organic solvents used. Ethanol-enabled GHGs (eGHGs) show a cross-linked three-dimensional (3D) network structure composed of random dispersed graphene, and greatly enhance the cycling stability of Si nanoparticles as an anode material for lithium ion batteries. This work extends the possibility of synthesizing network graphene macroform. © 2014 Elsevier B.V.

Yang X.,China Three Gorges University | Zhang P.,China Three Gorges University | Zhang P.,Shanghai Shanshan Technology Co. | Shi C.,China Three Gorges University | Wen Z.,CAS Shanghai Institute of Ceramics
ECS Solid State Letters | Year: 2012

Porous graphite/silicon micro-sphere is prepared by carbothermal reduction and spray drying method. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) are used to evaluate the phases, morphology and microstructure of the composite. Compared with the commercial graphite anode, the as-prepared composites with different silicon contents can exhibit reversible capacity between 426.5 and 755.5 mAh/g without dramatic capacity fading. The superior electrochemical performance is attributed to integrity of electrode material, improved adhesive strength between silicon and graphite, and porous structure composed of graphite flakes with different orientations. © 2012 The Electrochemical Society. All rights reserved.

Wang L.,Shanghai Second Polytechnic University | Shen L.,Shanghai Shanshan Technology Co. | Zhu L.,Shanghai Second Polytechnic University | Jin H.,Shanghai Second Polytechnic University | Bing N.,Shanghai Second Polytechnic University
Journal of Nanomaterials | Year: 2012

SnO2 nanoparticles coated on nitrogen-doped carbon nanotubes were prepared successfully via a simple wet-chemical route. The as-obtained SnO2/CNx composites were characterized using X-ray powder diffraction, scanning electron microscopy, and transmission electron microscopy. The photocatalytic activity of as-prepared SnO2/CNx for degradation Rhodamine B under UV light irradiation was investigated. The results show that SnO2/CNx nanocomposites have a higher photocatalytic activity than pure SnO2 and SnO2/CNTs nanocomposites. This enhanced photoresponse indicates that the photoinduced electrons in the SnO2 prefer separately transferring to the CNx, which has a high degree of defects. As a consequence, the radiative recombination of the electron-hole pairs is hampered and the photocatalytic activity is significantly enhanced for the SnO2/CNx photocatalysts. © 2012 Lingling Wang et al.

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