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Your search keyword '"Zhang, Ruihan"' showing total 7 results
Start Over Author "Zhang, Ruihan" Journal materials letters
7 results on '"Zhang, Ruihan"'

2. A comparative study of polyindole nanofibers membrane and polyindole film

Author

Cai Zhijiang, Shi Xingjuan, and Zhang Ruihan

Subjects
Materials science, Morphology (linguistics), Mechanical Engineering, Condensed Matter Physics, Casting, Electrospinning, chemistry.chemical_compound, Membrane, chemistry, Mechanics of Materials, Electrical resistivity and conductivity, Nanofiber, General Materials Science, Cyclic voltammetry, Composite material, Acetonitrile
Abstract

Polyindole nanofibers membrane was firstly fabricated by electrospinning and compared with polyindole film prepared using the solution casting method. Polyindole was dissolved in acetonitrile under ultrasonification. The electrospinning process was performed under electrical field strength of 1.4 kV/cm. The surface morphology of nanofiber was observed by SEM and TEM. The electrospun polyindole fibers exhibited smooth surface and the diameter of the fibers was about 160 nm. The structures of polyindole nanofibers membrane and polyindole film were characterized by X-ray diffraction test. The electrical properties were evaluated by electrical conductivity and cyclic voltammetry test.

Published
2013

6. Carboxylated carbon nanotube anchored MnCO3 nanocomposites as anode materials for advanced lithium-ion batteries.

Author

Zhang, Fan, Zhang, Ruihan, Liang, Gemeng, Feng, Jinkui, Lu, Li, and Qian, Yitai

Subjects
*CARBON nanotubes, *NANOCOMPOSITE materials, *ANODES, *LITHIUM-ion batteries, *SOLUTION (Chemistry), *TRANSMISSION electron microscopy, *MANGANESE compounds
Abstract

Abstract: Well dispersed MnCO3/carboxylated carbon nanotube (CNT) nanocomposites are prepared by a facile solution precipitation method. Transmission electron microscopy (TEM) characterizations show that due to heterogeneous nucleation sizes the addition of carboxylated CNT is able to suppress growth of MnCO3 particles, resulting in formation of nano-sized particles. Electrochemical characterization of lithiation/delithiation of the MnCO3/CNT nanocomposites reveals a large capacity of 772mAhg−1 for the first cycle with 84% capacity retention after 100 cycles. The superior electrochemical performance of the MnCO3/CNT nanocomposites electrode compared to the pure MnCO3 electrode can be attributed to super-fine particles and good conductivity due to the presence of CNTs. Their large surface area facilitates fast lithium ion and electron transport and accommodates the big volume change during the conversion reactions. [Copyright &y& Elsevier]

Published
2013
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7. Green and facile synthesis of porous ZnCO3 as a novel anode material for advanced lithium-ion batteries.

Author

Zhang, Ruihan, Zhang, Fan, Feng, Jinkui, and Qian, Yitai

Subjects
*CHEMICAL synthesis, *POROUS metals, *CARBON oxides, *ANODES, *LITHIUM-ion batteries, *METAL nanoparticles, *CLUSTERING of particles
Abstract

Abstract: ZnCO3 nanoparticle aggregations with porous morphology are prepared via a facile solid-state metathesis reaction in ambient environments. For the first time, ZnCO3 is characterized as a novel anode material for lithium-ion batteries. The porous ZnCO3 delivers an initial reversible capacity of 735mAhg−1 and good rate ability. The good electrochemical performance can be attributed to its unique hierarchy architecture, which facilitates the ion transport and buffers the large volume change during the alloying/de-alloying reactions. [Copyright &y& Elsevier]

Published
2014
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