期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202009197
关键词
electrocatalysis; iron carbide; mesoporous carbon tubes; oxygen reduction reaction; single‐ atomic Fe sites
类别
资金
- National Natural Science Foundation of China [52003300, 51973235, 51673061]
- Fundamental Research Fund for the Central Universities [CZP19001]
A simple and robust approach was employed to synthesize one-dimensional hollow tubular carbon-based materials with highly efficient oxygen reduction reaction performance. By simultaneously crafting single-atomic Fe sites and graphitic layer-wrapped Fe3C nanoparticles, the Fe-N-doped hollow mesoporous carbon tubes were successfully prepared and used as the ORR electrocatalyst. The impressive ORR performances of the Fe-N-HMCTs are attributed to the favorable configuration of active sites in conjunction with the advantageous 1D hollow tubular architecture.
The rational design and facile synthesis of 1D hollow tubular carbon-based materials with highly efficient oxygen reduction reaction (ORR) performance remains a challenge. Herein, a simple yet robust route is employed to simultaneously craft single-atomic Fe sites and graphitic layer-wrapped Fe3C nanoparticles (Fe3C@GL NPs) encapsulated within 1D N-doped hollow mesoporous carbon tubes (denoted Fe-N-HMCTs). The successional compositional and structural crafting of the hydrothermally self-templated polyimide tubes (PITs), enabled by Fe species incorporation and acid leaching treatment, respectively, yields Fe-N-HMCTs that are subsequently exploited as the ORR electrocatalyst. Remarkably, an alkaline electrolyte capitalizing on Fe-N-HMCTs achieves excellent ORR activity (onset potential, 0.992 V; half-wave potential, 0.872 V), favorable long-term stability, and strong methanol tolerance, outperforming the state-of-the-art Pt/C catalyst. Such impressive ORR performances of the Fe-N-HMCTs originate from the favorable configuration of active sites (i.e., atomically dispersed Fe-N-x sites and homogeneously incorporated Fe3C@GL NPs) in conjunction with the advantageous 1D hollow tubular architecture containing adequate mesoporous surface. This work offers a new view to fabricate earth-abundant 1D Fe-N-C electrocatalysts with well-designed architecture and outstanding performance for electrochemical energy conversion and storage.
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