N-doped cnt-pani based hybrid nanostructures for supercapacitor electrode = 질소 도핑된 카본나노튜브와 폴리아닐린 나노복합체를 이용한 수퍼캐패시터 전극에 관한 연구

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We synthesized multicomponent hybrid nanostrcutures by variation of chemical processing routes. The hybrid nanostructure is based on nitrogen doped CNT (nCNT), polyaniline (pani) and metal oxides (MnOx & RuOx). The interaction between nCNT and pani resulted in a strong bond between protonated pyridinic N and aniline radical. Such kind of bonding is explained by proposing a radical-cation coupling model (RCCM). The strong coupling between nCNT and pani is evident from the N1s deconvoluted XPS spectra where a new peak arises at 398.9eV. Raman spectra taken before and after solution processing of nCNT-pani showed the presence of pani peaks. Due to the close interaction and strong bonding, our hybrid nanostructure (nCNT-pani) showed specific capacitance value of 1,450 F/g and 515 F/g in neutral and acidic electrolyte respectively that is comparatively higher than reported before. Similarly the electrochemical performance is further enhanced by incorporation of metal oxides in nCNT-pani via one step and two-step process. We achieved a maximum specific capacitance value (1,817 F/g) for nCNT-pani/MnOx-1 in neutral solution. Similarly, in case of nCNT-pani/RuOx-2, a specific capacitance value of (1,155 F/g) was achieved in acidic solution almost double the value of nCNT-pani. The overall good electrochemical performance exhibited by our two and three component hybrid nanostructures is considered to be because of very close interactions among them.
Advisors
Kim, Sang-Oukresearcher김상욱
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
568109/325007  / 020104497
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2012.8, [ vi, 51 p. ]

Keywords

nitrogen doped carbon nanotube; 정전 용량; 라디칼 양이온 커플링; 메탈옥사이드; 폴리아닐린; 질소도핑탄소나노튜브; polyaniline; metal oxides; radical-cation coupling; specific capacitance

URI
http://hdl.handle.net/10203/197376
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=568109&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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