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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Mixed Colloidal Suspensions and Lithiated Nanocomposites of Layered MnO2 and RuO2 Nanosheets

등록일
2014년 8월 29일 10시 21분 42초
접수번호
1379
발표코드
MAT.P-1161 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
이슬, JINXIAOYAN, 구태하, 황성주*
이화여자대학교 화학·나노과학과, Korea
Homogeneously mixed colloidal suspensions of layered MnO2 and RuO2 nanosheets are synthesized by mixing the exfoliated colloidal nanosheets of each metal oxide. According to zeta potential measurement and UV-vis absorption spectroscopy analysis, the obtained colloidal suspensions show negatively-charged state and good colloidal stability without any phase separation. The co-flocculation of these anionic colloidal nanosheets with lithium cations yields well-ordered intercalation compounds of Li-MnO2-RuO2 nanocomposites (LMR). Electron microscopy and N2 adsorption-desorption isotherm measurements clearly demonstrate that the MnO2 2D nanosheets in these materials are intimately coupled with the surface of RuO2 2D nanosheets and the house-of-cards-type stacking of two kinds of 2D nanosheets is responsible for highly porous materials with remarkably expanded surface area. The resulting LMR nanocomposites display highly porous structure with expanded surface. In comparison with the RuO2-free Li-MnO2 nanocomposites (~251 F g-1), the present LMR nanocomposites deliver larger capacitances with good cyclability upto the 5000th cycle. The present experimental findings clearly demonstrate that the mixed colloidal suspensions of MnO2 nanosheets and RuO2 nanosheets are very useful precursors for synthesizing high performance electrochemical capacitors.

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