Carbon nanofibers as parent materials for a graphene-based Fe-N-C catalyst for the oxygen reduction reaction
| Autor: | Min Wook Chung, Chang Hyuck Choi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Carbon nanofiber Graphene Inorganic chemistry Graphene foam chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry law Nanofiber Graphite 0210 nano-technology Carbon Graphene oxide paper |
| Zdroj: | Catalysis Today. 295:125-131 |
| ISSN: | 0920-5861 |
| Popis: | Chemically-exfoliated graphene materials have been widely investigated for various applications. The graphene materials are typically synthesized from graphite granules, but their success as support materials of Fe-N-C electrocatalysts for the oxygen reduction reaction is highly ambiguous due to their large sheet-like morphology impeding the efficient transport of reactants/products. In this study, we synthesize a graphene-based Fe-N-C catalyst from cabon nanofibers as parent materials, which consist of stacked-cup carbon surrounded by a few graphitic walls. This Fe-N-C catalyst shows a much improved catalytic activity compared with that synthesized from graphite granules. The physical and electrochemical characterizations reveal that the carbon nanofibers are simultaneously transferred into a mixture of small graphene ribbons and flakes after chemical exfoliation and surface modification, forming a porous network structure in a fabricated electrode with a modified electronic structure. The electrocatalytic pathway, methanol-tolerance, and active site of the graphene-based Fe-N-C catalyst are also investigated. The results show that the carbon nanofibers are promising parent carbon materials for preparation of graphene-based Fe-N-C electrocatalysts. |
| Databáze: | OpenAIRE |
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