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Fabricating hierarchically porous and Fe3C-embeded nitrogen-rich carbon nanofibers as exceptional electocatalysts for oxygen reduction.
- Source :
-
Carbon . Feb2019, Vol. 142, p115-122. 8p. - Publication Year :
- 2019
-
Abstract
- Abstract Transition metal and heteroatom doping porous carbon exhibits a promising perspective as non-noble metal electrocatalyst. In this work, we develop a novel and scalable strategy to synthesize hierarchically porous nitrogen-doped carbon nanofibers embedded with abundant Fe 3 C nanoparticles from continuous electrospun of iron-based metal organic frameworks (MOFs) and polyacrylonitrile nanofibrous precursors. The as-prepared Fe 3 C/NCNFs (NCNFs for nitrogen-doped carbon nanofibers) exhibit high graphitization degree, high specific surface area, hierarchically meso-microporous structures and well-dispersion of carbon-shielded ultrafine Fe 3 C nanoparticles. The Fe 3 C/NCNFs exhibit superior electrocatalytic performance towards oxygen reduction reaction with an onset potential of 1.012 V and a half-wave potential of 0.873 V in alkaline media, exceeding the benchmark commercial Pt/C catalyst by ca. 13 and 46 mV, respectively. Moreover, the onset and half-wave potentials of Fe 3 C/NCNF are 0.832 and 0.664 V in acid media, respectively, which are also comparable to commercial Pt/C catalyst. The dramatically improved electrocatalytic performance is attributed to the continuous one-dimensional (1D) structure of Fe 3 C/NCNFs enhancing electro-conductivity compared with simple MOF-derived carbon. Our study demonstrates the Fe 3 C/NCNF nanofibers a promising candidate for efficient, robust electrocatalyst for economic platinum-free fuel cells. Graphical abstract A novel metal organic frameworks-based carbon nanofiber is prepared by pyrolyzed electrospun nanofibers. One-dimension structure, abundant Fe 3 C nanoparticles and hierarchical pore structure of carbon nanofibers facilitates the electron transfer and enlarges the electrode-electrolyte interfaces. This carbon nanofibers exhibits superb electrocatalyst performance for oxygen reduction reaction, outperforming benchmark Pt/C catalysts in alkaline media. Image 1 [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 142
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 133367125
- Full Text :
- https://doi.org/10.1016/j.carbon.2018.10.040