Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 7, Pages 4297-4309Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta11208a
Keywords
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Funding
- Basic Science Research Program of the National Research Foundation of Korea [2020R1F1A1076520, 2020R1A4A4079870, 2018M3D1A1057844, 2018M1A2A2061975]
- New & Renewable Energy Core Technology Program of KETEP in Korea [20203020030010]
- GRRC program of Gyeonggi province [GRRCHanyang2020-B01, GRRCHanyang2020-B03]
- National Research Foundation of Korea [2020R1A4A4079870, 2020R1F1A1076520] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study reports a novel FeSiNC catalyst with excellent oxygen reduction reaction activity in zinc-air and fuel cells, comparable to the most efficient non-Pt-based catalysts, and exhibits outstanding performance in single-cell devices.
The development of non Pt-based catalysts (non-PBCs) that show excellent oxygen reduction reaction (ORR) activity for high-performance Zn-air battery (ZAB) and anion exchange membrane fuel cell (AEMFC) is highly necessitated. Here, the unprecedented single-atom ORR activity of Fe, Si, and N co-doped carbon (FeSiNC) supported on 3D interconnected mesoporous carbons (25 and 50 nm) derived from silica templates is reported. Si moieties connected to a carbon surface were involved in the formation of an atomically distributed FeSixN4-x site through substitution of Si at the N position in the Fe-N-4 site, which is the ORR active site of the conventional FeNC. FeSiNC with its larger mesopore (50 nm) exhibits outstanding ORR activity comparable to the most efficient non-Pt-based catalysts and enhanced single-cell performances due to its enhanced mass-transport property. According to theoretical calculations, the ORR activity is originated from not only FeSixN4-x sites located at the basal plane and inter-edge sites, but also C sites adjacent to the Si dopant in both edge and basal regions. Therefore, this study provides a facile strategy toward the rational design of inexpensive and highly active ORR catalysts applicable to single-cell devices.
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