| 학회 |
한국화학공학회 |
| 학술대회 |
2019년 가을 (10/23 ~ 10/25, 대전컨벤션센터) |
| 권호 |
25권 2호, p.2007 |
| 발표분야 |
촉매 및 반응공학 (Catalysis and Reaction Engineering) |
| 제목 |
Structural Evolution of Fe Center in Fe–N/C Oxygen Reduction Reaction Electrocatalysts during Silica Coating-Mediated Synthesis |
| 초록 |
Iron and nitrogen-doped carbon (Fe–N/C) catalysts are considered the most promising alternative to Pt-based catalysts due to their excellent oxygen reduction reaction (ORR) activity. Recently, we have developed a silica coating-mediated synthesis strategy that can preferentially generate ORR-active Fe–Nx sites while suppressing inactive Fe clusters. However, in previous studies, the origin of preferential formation of Fe–Nx active sites was not clearly revealed. In this work, we investigated how the active Fe center evolves during the steps of silica coating-mediated synthesis by X-ray absorption spectroscopy and 57Fe Mӧssbauer spectroscopy. We confirmed that the bond between the Fe center and Si of the silica is formed when the Fe–N–C composite is coated with silica. As a result, the catalyst prepared with silica coating comprised twice higher density of Fe–Nx sites than the catalyst without the silica coating, leading to twice higher current density. |
| 저자 |
우진우1, 사영진2, 주상훈1
|
| 소속 |
1School of Energy and Chemical Engineering and Department of Energy Engineering, 2Ulsan National Institute of Science and Technology (UNIST) |
| 키워드 |
촉매 |
| E-Mail |
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| 원문파일 |
초록 보기 |
