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7 results on '"Zhou, Gumin"'

4. Removal of some impurities from carbon nanotubes

Author

Feng Yongcheng, Yu Zuolong, Zhou Gumin, Meizhen Qu, and Guoping Wang

Subjects
Materials processing, Materials science, Carbon nanofiber, Physics::Medical Physics, General Physics and Astronomy, Nanotechnology, Carbon nanotube, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, law.invention, Condensed Matter::Materials Science, Chemical engineering, Impurity, law, Transmission electron microscopy, Frit compression, Gas chromatography, Carbon nanotube supported catalyst, Physics::Chemical Physics, Physical and Theoretical Chemistry
Abstract

A non-destructive mild oxidation method of removing some impurities from as-grown carbon nanotubes (CNTs), including single-wall carbon nanotubes (SWNTs) and multi-wall carbon nanotubes (MWNTs), by H2O2 oxidation and HCl treatment, has been investigated, and somewhat pure carbon nanotubes have been prepared. The CNTs from which some impurities were removed have been evaluated by transmission electron microscopy (TEM) and temperature programmed oxidation and gas chromatography (TPO–GC).

Published
2003

5. A study of activated carbon nanotubes as electrochemical super capacitors electrode materials

Author

Meizhen Qu, Zhou Gumin, Yu Zuolong, Bo-Lan Zhang, and Qing-Mei Jiang

Subjects
Electrolytic capacitor, Supercapacitor, Materials science, Scanning electron microscope, Mechanical Engineering, Nanotechnology, Carbon nanotube, Condensed Matter Physics, Electrochemistry, law.invention, Chemical engineering, Mechanics of Materials, Transmission electron microscopy, law, Specific surface area, medicine, General Materials Science, Activated carbon, medicine.drug
Abstract

Activated carbon nanotubes (CNTs) were produced by KOH. The activated CNTs and the normal CNTs were both used as the electrochemical super capacitors (ESCs) electrode materials. The electrochemical capacitance of the activated CNTs was 2 times that of the normal CNTs. Moreover, the activated CNTs had 3 times BET specific surface area and 1.5 times pore volume than those of the normal CNTs. The activated CNTs and the normal CNTs were both examined by transmission electron microscopy (TEM), scanning electric microscopy (SEM) and X-ray diffraction (XRD).

Published
2002

7. α-Fe2O3@CNSs nanocomposites as superior anode materials for lithium-ion batteries

Author

Shao, Jin, Zhang, Jingxian, Jiang, Jinjin, Zhou, Gumin, and Qu, Meizhen

Subjects
*NANOCOMPOSITE materials, *FERRIC oxide, *ANODES, *LITHIUM-ion batteries, *ELECTRIC capacity, *CARBON, *NANOSTRUCTURED materials
Abstract

Abstract: The nanocomposite of hematite@carbon nanosprings (α-Fe2O3@CNSs) was synthesized by simple precipitation and following heat treatment, in which the amount of α-Fe2O3 can be easily controlled by changing the synthesis conditions. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), Brunau–Emmertt–Teller (BET), and X-ray photoelectron spectroscopy (XPS) were employed to characterize the as-synthesized nanocomposite. When applied as anode in Li-ion batteries (LIBs), the effect of α-Fe2O3/CNSs weight ratio on electrochemical performance of α-Fe2O3@CNSs nanocomposite has been researched. Enhancing the amount of α-Fe2O3 in nanocomposite would make the increase of specific capacity, but led to the degradation of cyclic stability and rate capability. The electrode of S-FeC (with weight ratio of CNSs/α-Fe2O3 about 4:1) could deliver a charge capacity of 527.6mAhg−1at 0.2C with excellent cyclability (96.9% capacity retention after 50 cycles), and retained 343.3mAhg−1even at the rate of 5.0C. In comparison with pure CNSs and α-Fe2O3, the improved cycling performance, specific capacity and rate capability of S-FeC should be mainly attributed to the combined effects of uniformly dispersed nanosized α-Fe2O3 particles and the highly strong network of CNSs. [Copyright &y& Elsevier]

Published
2011
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