Nitrogen-doped hollow macroporous carbon spheres with high electrocatalytic activity for oxygen reduction

The nitrogen-doped hollow macroporous carbon spheres (NHMCS) were synthesized by silica template using 3-ethyl-1-vinylimidazolium tetrafluoroborate ([VEIM]BF4) as the source of carbon and nitrogen. The as prepared NHMCS were characterized by scanning electron microscopy, transmission electron micros...

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Bibliographic Details
Published in:Materials letters 2012-02, Vol.68, p.453-456
Main Authors: Zheng, Fei, Mu, Guiqin, Zhang, Zhiming, Shen, Yaou, Zhao, Maojun, Pang, Guangtang
Format: Article
Language:English
Subjects:
Carbon
Carbon materials
Crossovers
Fuel cells
High resistance
Methyl alcohol
Ntrogen-doped
Oxygen reduction
Pathways
Platinum
Porous materials
Reduction
Scanning electron microscopy
Structural
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Summary:The nitrogen-doped hollow macroporous carbon spheres (NHMCS) were synthesized by silica template using 3-ethyl-1-vinylimidazolium tetrafluoroborate ([VEIM]BF4) as the source of carbon and nitrogen. The as prepared NHMCS were characterized by scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller and elemental analysis. The results show that NHMCS have the ordered macroporous structure, high-surface-area as well as 1.7% nitrogen doped content. The typical electrochemical methods were used to study the activity of NHMCS for oxygen reduction reaction in alkaline media, and the results show that NHMCS possess better electrocatalytic activity and high resistance to the methanol crossover than commercial Pt/C via a four-electron pathway. [Display omitted] ► Nitrogen-doped hollow macroporous carbon microspheres (NHMCMS) work as non-noble-metal electrocatalysts for ORR. ► NHMCMS possess 3D macroporous ordered structure with good diffusion properties of oxygen. ► NHMCMS show high electrocatalytic activity and tolerance to crossover effect of methanol toward ORR in alkaline solution.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2011.11.035