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Process, structure and electrochemic...

Jagannathan, Sudhakar.

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Process, structure and electrochemical properties of carbon nanotube containing films and fibers.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Process, structure and electrochemical properties of carbon nanotube containing films and fibers./
作者:	Jagannathan, Sudhakar.
面頁冊數:	228 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5754.
Contained By:	Dissertation Abstracts International70-09B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3376296
ISBN:	9781109372328

Process, structure and electrochemical properties of carbon nanotube containing films and fibers.
Jagannathan, Sudhakar.

Process, structure and electrochemical properties of carbon nanotube containing films and fibers. - 228 p.

Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5754.

Thesis (Ph.D.)--Georgia Institute of Technology, 2009.

The objective of this thesis is to study the effect of process conditions on structure and electrochemical properties of polyacrylonitrile (PAN)/carbon nanotube (CNT) composite film based electrodes developed for electrochemical capacitors. The process parameters like activation temperature, CNT loading in the composite films are varied to determine optimum process conditions for physical (CO2) and chemical (KOH) activation methods. Films prepared by solution casting, fibers spun by solution spinning, and gel spinning and buckypapers made from SWNT and MWNT were used in this study. The PAN/CNT precursors are stabilized in air, carbonized in inert atmosphere (argon), and activated by physical (CO2) and chemical (KOH) methods. The physical activation process is carried out by heat treating the carbon precursors in CO2 atmosphere at activation temperatures. In the chemical activation process, stabilized carbon precursors are immersed in aqueous solutions of activating media (KOH), dried, and subsequently heat treated in an inert atmosphere at the activation temperature. The structure and morphology are probed using scanning electron microscopy, x-ray diffraction, and fourier transform infrared spectroscopy. The specific capacitance, power and energy density of the activated electrodes are evaluated with aqueous electrolytes (KOH) as well as organic electrolyte (ionic liquid in acetonitrile) in Cell Test. The surface area and pore size distribution of the activated composite electrodes are evaluated using nitrogen absorption. Specific capacitance dependence on factors such as surface area and pore size distribution are studied.

ISBN: 9781109372328Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Process, structure and electrochemical properties of carbon nanotube containing films and fibers.
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245 1 0 $a Process, structure and electrochemical properties of carbon nanotube containing films and fibers.
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500 $a Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5754.
500 $a Adviser: Satish Kumar.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2009.
520 $a The objective of this thesis is to study the effect of process conditions on structure and electrochemical properties of polyacrylonitrile (PAN)/carbon nanotube (CNT) composite film based electrodes developed for electrochemical capacitors. The process parameters like activation temperature, CNT loading in the composite films are varied to determine optimum process conditions for physical (CO2) and chemical (KOH) activation methods. Films prepared by solution casting, fibers spun by solution spinning, and gel spinning and buckypapers made from SWNT and MWNT were used in this study. The PAN/CNT precursors are stabilized in air, carbonized in inert atmosphere (argon), and activated by physical (CO2) and chemical (KOH) methods. The physical activation process is carried out by heat treating the carbon precursors in CO2 atmosphere at activation temperatures. In the chemical activation process, stabilized carbon precursors are immersed in aqueous solutions of activating media (KOH), dried, and subsequently heat treated in an inert atmosphere at the activation temperature. The structure and morphology are probed using scanning electron microscopy, x-ray diffraction, and fourier transform infrared spectroscopy. The specific capacitance, power and energy density of the activated electrodes are evaluated with aqueous electrolytes (KOH) as well as organic electrolyte (ionic liquid in acetonitrile) in Cell Test. The surface area and pore size distribution of the activated composite electrodes are evaluated using nitrogen absorption. Specific capacitance dependence on factors such as surface area and pore size distribution are studied.
520 $a Carbon nanotube containing electrode is developed with high specific capacitance, energy density and power density. The process conditions for physical and chemical activation processes were varied and conditions for achieving superior electrochemical properties, surface area and controlled pore size were determined. A maximum specific capacitance of 300 F/g in KOH electrolyte and maximum energy density of 22 wh/kg in ionic liquid has been achieved. BET surface areas in excess of 2500 m2/g with controlled pore sizes in 1--5 nm range has been attained in this work. The specific capacitances of physically and chemically activated samples have direct positive correlation to micropore volume.
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