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Journal of Materials Chemistry A
Page 7 of 9
Journal Name
ARTICLE
procedure in O
HClO
2
-saturated 0.1 M KOH (Fig. 6E) and 0.1 M The authors are grateful to financial support from China
DOI: 10.1039/C6TA04941A
4
(Fig. 7E) at a rotation speed of 1600 rpm with a scan National Natural Science Foundation (No. 21303058), Shanghai
-
1
rate of 10 mVs . The n value derived from the RRDE Municipal Natural Science Foundation (No. 13ZR1412400), and
measurements (Fig. 6F,7F) is consistent with the result from the key project of Shanghai Science and Technology
K−L plots, indicating the main reaction pathway is 4e for Committee (No. 11JC1403400 and 14231200300).
2
reducing O process on Fe-P-C electrode. These facts verify
that Fe-P-C-900 can efficiently catalyze the reaction of
oxygen reduction in a direct nearly four-electron-reduction
pathway at low over potential in acidic and alkaline media.
The crossover effect was also estimated on Fe-P-C-900
Notes and references
1
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2
and Pt/C catalysts in both O
2
-saturated alkaline (0.1 M KOH)
3
and acidic (0.1 M HClO ) media in the presence of methanol.
4
After the injection of methanol (3%), no significant changes
are observed in the ORR current density over Fe-P-C-900
catalysts in both alkaline (Fig. 8A) and acidic (Fig. 8B) media,
whereas the current decreased sharply for the Pt/C catalyst.
These results clearly suggest the Fe-P-C-900 catalyst have
excellent methanol-tolerance performance as ORR
electrocatalyst of fuel cells using methanol fuel. The
durability of the prepared Fe-P-C-900 and Pt/C catalysts in
4
5
B. Fang, N. K. Chaudhari, M. -S. Kim, J. H. Kim, J.-S. Yu, J. Am.
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both O
HClO ) media was investigated. From the corresponding
chronoamperometric, it can be seen that after running for
0, 000 s in 0.1 M KOH and 0.1 M HClO
2
-saturated alkaline (0.1 M KOH) and acidic (0.1 M
2013, 19, 16170-16175.
4
0 A.G. Kong, X.F. Zhu, Z. Han and Y.K. Shan, ACS Catalysis,
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2
2
4
, it shows 11 A.G. Kong, Y.Y. Kong, X.F.Zhu and Y.K. Shan, Carbon, 2014,
insignificant decay (about 4 % and 14 %) in current density
on the Fe-P-C-900 electrodes at 0.55 and 0.57 V. The better
catalytic stability of Fe-P-C materials may be related to the
lower H O yields of ORR over Fe-P-C-900 (Fig. 6F and 7F).
2 2
However, owing to the easy-poisoning property of 14 S. Chao, Z. Bai, Q. Cui, H. Yan, K. Wang, L. Yang, Carbon, 2015,
nanosized Pt metal and the probable exfoliation of Pt metal
from carbon supports, the commercial Pt/C catalyst suffers
from 37 % loss of current density after running for 25, 000 s
in 0.1 M KOH (Fig.8C) and 57 % loss after running for 20,
78, 49-59.
1
2 Y.W. Ju, S. Yoo, C. Kim, S. Kim, I.Y. Jeon, J. Shin, J.B. Baek and
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0
4
00 s in 0.1 M HClO (Fig. 8D). These results reveal the 17 F. Razmjooei, K.P. Singh, E.J. Bae, J.S. Yu, J. Mater. Chem.
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In summary, we have developed an efficient ordered
mesoporous Fe-P-C electrocatalyst toward ORR in both
acidic and alkaline media. The specially chosen
3
2
(
3 2 3
Ph P) Fe(CO) compound with Fe-P coordination centers 22 J. Wu, Z. Yang, Q. Sun, X. Li, P. Strasser, R. Yang, Electrochim.
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route confirmed a slightly negative Eonset, Ep, and E1/2 values
and higher current density to commercial Pt/C in 0.1 M KOH.
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Acknowledgements
This journal is © The Royal Society of Chemistry 20xx
J. Name., 2013, 00, 1-3 | 7
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