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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Modification of Oxygen Reduction Electrode with Gold Nanocluster

등록일
2019년 8월 22일 10시 28분 07초
접수번호
0950
발표코드
ELEC.P-411 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Electrochemistry
저자 및
공동저자
Hanseok Yi, Kyuju Kwak, Young Lim Byeon, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
 Oxygen Reduction Reaction (ORR) is a key reaction of fuel cell that is the most important energy storage device in green chemistry. Many researchers have made effort to positively shift the onset potential (Eonset) of the ORR and to satisfy 4 electron pathway (direct pathway) in the reaction. Recently, metal nanoparticles have attracted much attention due to their different optical, electrochemical and ORR catalytic properties from bulk metals. Unlike relatively large gold nanoparticles, ligand-protected gold nanoclusters that have a size of less than 2 nm show a redox activity like molecules. In this presentation, we prepared a well-modified electrode using Au25(C6S)18 (C6S=hexanethiol), Nafion and multi wall carbon nanotube (MWNT). In the modified electrode (Au25/Nafion/MWNT), Au25 and MWNT act as redox mediator and electronic conductor, respectively. The Eonset of the ORR in Nafion/MWNT electrode had -0.4 V vs. Ag/AgCl. However, Au25/Nafion/MWNT electrode positively shifted 200 mV than w/o Au25 electrode due to the redox mediator effect of Au25. In addition, we observed that the number of electron is 3.77 (n=3.77) in the ORR with Au25/Nafion/MWNT electrode, unlike Nafion/MWNT electrode had 2.08 (n=2.08) using by RDE.

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