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Your search keyword '"Nie, Ping"' showing total 38 results
Start Over Author "Nie, Ping" Publisher royal society of chemistry (rsc)
38 results on '"Nie, Ping"'

10. Facile synthesis of nitrogen-doped carbon derived from polydopamine-coated Li3V2(PO4)3 as cathode material for lithium-ion batteries

Author

Xiaogang Zhang, Nie Ping, Hongshen Li, Cunliang Zhang, Gang Pang, and Guiyin Xu

Subjects
Materials science, Carbonization, General Chemical Engineering, Composite number, Analytical chemistry, chemistry.chemical_element, General Chemistry, Cathode, law.invention, chemistry, X-ray photoelectron spectroscopy, Chemical engineering, law, Electrode, Lithium, Spectroscopy, Carbon
Abstract

Nitrogen-doped, carbon-coated Li3V2(PO4)3 cathode materials were prepared by the oxidative self-polymerization of dopamine on the Li3V2(PO4)3 surface and subsequent carbonization of polydopamine. Field emission scanning electron microscopy (FESEM), scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS) and X-ray photoelectron spectroscopy (XPS) were performed to characterize morphologies and structures. The uniform nitrogen-doped, carbon coating provided a continuous electronic conducting network. Furthermore, the existence of nitrogen in the composite can improve electronic conductivity. As cathode materials for lithium-ion batteries, the nitrogen-doped, carbon-coated Li3V2(PO4)3 composites display superior rate performance and excellent cycle performance over the pristine Li3V2(PO4)3 and carbon-coated Li3V2(PO4)3. The electrode delivers high specific capacity of 74 mA h g−1 at 10 C, and still remains at 95.4% of initial capacity after 100 cycles at 1 C.

Published
2014
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33. Fabrication of porous carbon spheres for high-performance electrochemical capacitors

Author

Haifu Deng, Jie Wang, Nie Ping, Xiaogang Zhang, Laifa Shen, Bing Ding, and Hui Dou

Subjects
Nanostructure, Materials science, General Chemical Engineering, chemistry.chemical_element, Nanotechnology, General Chemistry, Microporous material, Electrochemistry, Hydrothermal carbonization, chemistry, Specific surface area, Electrode, Mesoporous material, Carbon
Abstract

Porous carbon spheres (PCS) with meso/microporous structure are designed and fabricated through a facile hydrothermal method by employing glucose as a carbon precursor and sodium molybdate (Na2MoO4) as a porogen, structure-direct agent and catalyst. With the assistance of Na2MoO4, the porous structure of the carbon sphere is significantly enhanced. In addition, the meso/microporous structure can be modulated by adjusting the proportion of the reactants. In optimal conditions, the PCS exhibit a high specific surface area (SSA, 757.3 m2 g−1) and pore volume (0.24 cm3 g−1). When evaluated as an electrode for electrochemical capacitors, the PCS exhibits a high specific capacitance of 260 F g−1 with remarkable high-rate performance and long-term cycling stability. The excellent electrochemical performances are exclusively attributed to the micro/mesoporous structure, which maximize the ion accumulation on the electrode surface and facilitate fast ion transportation. The well-defined porous nanostructure plus easy strategy make current study provide new opportunities for hydrothermal carbonization of biomass as electrode materials for energy storage.

Published
2014
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