| 학회 |
한국화학공학회 |
| 학술대회 |
2018년 봄 (04/25 ~ 04/27, 창원컨벤션센터) |
| 권호 |
24권 1호, p.1058 |
| 발표분야 |
Meet the Young Researcher Poster Session(Post-Doc.급 연구원) |
| 제목 |
Electrochemical Evidence for Two Sub-families of FeNxCy Moieties with Concentration-dependent Cyanide Poisoning |
| 초록 |
Iron-nitrogen-carbon (Fe-N-C) catalysts are one of the most promising family of materials for the successful replacement of noble Pt in low temperature fuel cells. Despite recent advances in the synthesis, activity and site-structure of Fe-N-C catalysts, further improved understanding of the nature of the Fe-based active sites is still needed. In the present study, the existence of two sub-families of FeNxCy moieties is revealed by the concentration-dependence of cyanide poisoning on a Fe-N-C catalyst only comprising atomically dispersed iron. The analysis of the activity decrease upon contact with various cyanide concentrations and activity recovery following rinsing with water reveals the presence of two sub-groups of ORR-active FeNxCy species. They are discriminated by the reversibility or irreversibility of the cyanide poisoning. From Mössbauer spectroscopy study and poisoning test on a model compound Fe(II) phthalocyanine (FePc), we hypothesize that the reversibility/irreversibility of cyanide poisoning is governed by the competitive adsorption of oxygen molecule and cyanide anion. |
| 저자 |
정민욱1, 전가전1, 김형준2, 최창혁1
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| 소속 |
1GIST, 2KAIST |
| 키워드 |
Electrochemistry; Fuel cells; Heterogeheous catalysis; Cyanides
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| E-Mail |
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| 원문파일 |
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