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| Type |
Poster Presentation |
| Area |
전기화학 |
| Room No. |
포스터발표장 |
| Time |
4월 21일 (금요일) 13:00~14:30 |
| Code |
ELEC.P-517 |
| Subject |
Cobalt and silver electrodeposition as an efficient oxygen reduction reaction electrocatalyst |
| Authors |
문신영, 이영미1,*, 조윤빈1
이화여자대학교 화학.나노과학과, Korea
1이화여자대학교 화학나노과학과, Korea
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| Abstract |
Oxygen reduction reaction (ORR) is one of the sluggish reactions that occur in fuel cells. Although platinum (Pt) and its alloy materials are the best catalysts for ORR, its high cost and limited amounts make commercial uses of Pt difficult. Among the non-Pt-based electrocatalysts for ORR, silver (Ag) is a well-known alternative to Pt with low price and the fine catalytic activity of reducing oxygen through the direct four-electron transfer reaction. To decrease the overpotential and enhance the activity of Ag in alkaline media, the weak binding of the oxygen atom to Ag surface in the first step of ORR (O-O bond cleavage) can be improved by mixing Ag with cobalt (Co). Cobalt helps the O-O bond breakage and then Ag reduces the resulting adsorbed atomic oxygen. In this work, Ag and Co are electrodeposited on glassy carbon rotating disk electrode (GC-RDE) simultaneously and their electrocatalytic activity for ORR is studied by varying the atomic ratio of Ag and Co. The structure and electrocatalytic activities of Ag-Co are characterized by cyclic voltammetry (CV), linear sweep voltammetry (LSV), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Ag-Co catalyst of which the metal precursor ratio of Ag:Co is 1:7 and the deposition time is 200 s (Ag1Co7-200) exhibits better catalytic activity than both pure Ag and pure Co and the comparable activity to bare Pt disk electrode.
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT& Future Planning (2014R1A2A2A05003769).
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| E-mail |
cubox@naver.com |
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119th General Meeting of the KCS