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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
Main Authors: Kim, Jong Gyeong, Cho, Jinwon, Han, Sunghoon, Lee, Hyejin, Yuk, Eunsung, Bae, Byungchan, Jang, Seung Soon, Pak, Chanho
Format: Article
Language:English
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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.
ISSN:2050-7488
2050-7496
DOI:10.1039/D1TA07264A