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Achieving excellent activity and stability for oxygen reduction electrocatalysis by hollow mesoporous iron–nitrogen-doped graphitic carbon spheres
| Content Provider | Semantic Scholar |
|---|---|
| Author | Zhou, Tingsheng Zhou, Yao Ma, Ruguang Liu, Qian Zhu, Yufang Wang, Jiacheng |
| Copyright Year | 2017 |
| Abstract | The replacement of platinum (Pt) by nonprecious catalysts with superior activity and stability for the oxygen reduction reaction (ORR) remains challenging for fuel cell devices. Herein, we describe a controllable strategy to prepare hollow graphitic carbon spheres with Fe–N-doped mesoporous shells via in situ polymerization and functionalization. The optimized catalyst exhibits very superior ORR activity with a half-wave potential (E1/2) of 0.886 V in 0.1 M KOH, 15 mV more positive than that of commercial Pt/C catalysts. Even in acidic solution, it also shows a competitive 4e− ORR activity compared to Pt/C. Most importantly, it demonstrates much better long-term stability and resistance to methanol crossover than Pt/C in both alkaline and acidic media. The outstanding activity is contributed by the synergy of chemical functions (Fe–Nx-coordinated moieties) and excellent structural properties (hollow large cores (∼91 nm), open mesopores (∼2.1 nm) throughout the shells, and highly graphitic microstructures), ensuring rapid mass-diffusion and electron-transfer kinetics and full accessibility of catalytic sites. |
| Starting Page | 12243 |
| Ending Page | 12251 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C7TA01896G |
| Volume Number | 5 |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c7/ta/c7ta01896g/c7ta01896g1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C7TA01896G |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
