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Boosting activity toward oxygen reduction reaction of a mesoporous FeCuNC catalyst via heteroatom doping-induced electronic state modulation
Non-precious metal catalysts for oxygen reduction reaction (ORR) are promising alternatives to Pt/C in fuel cells, thus, demand for advanced catalysts is arising. Herein, we prepared and characterized mesoporous Fe and Cu anchored in N-, S-, and P-doped carbon (FeCu x NC) catalysts, revealing the pr...
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Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-03, Vol.10 (10), p.5361-5372 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Non-precious metal catalysts for oxygen reduction reaction (ORR) are promising alternatives to Pt/C in fuel cells, thus, demand for advanced catalysts is arising. Herein, we prepared and characterized mesoporous Fe and Cu anchored in N-, S-, and P-doped carbon (FeCu
x
NC) catalysts, revealing the presence of ordered mesoporous grain-shaped particles and demonstrating that the electronic state of the active sites (Fe–N
x
) is controlled by their environments, which can affect ORR kinetics. Half-cell measurements revealed that FeCu
x
NC promoted ORRs more effectively (0.92 V at 3 mA cm
−2
) than Pt/C (0.87 V at 3 mA cm
−2
) in alkaline conditions, while a current density of 490 mA cm
−2
was achieved at 0.6 V in a single-cell level. Multi-heteroatom doping modulated the energy of OOH* and OH
−
adsorption on the active sites, and the lowest overpotential (according to density functional theory calculations) was obtained for the Fe–Cu–N
3
–C–P–S model. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/D1TA07264A |