Kim, Hee Soo Lee, Chi Ho Jang, Jue-Hyuk Kang, Min Seok Jin, Haneul Lee, Kug-Seung Lee, Sang Uck Yoo, Sung Jong Yoo, Won Cheol 2024-01-19T15:30:48Z 2024-01-19T15:30:48Z 2021-10-21 2021-02-21 2050-7488 https://pubs.kist.re.kr/handle/201004/117388 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. English ROYAL SOC CHEMISTRY Single-atom oxygen reduction reaction electrocatalysts of Fe, Si, and N co-doped carbon with 3D interconnected mesoporosity Article 10.1039/d0ta11208a 1 JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.7, pp.4297 - 4309 JOURNAL OF MATERIALS CHEMISTRY A 9 7 4297 4309 scie scopus 000621407000048 2-s2.0-85101563236 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article ACTIVE-SITES FUEL-CELLS FE/N/C CATALYSTS PERFORMANCE ALKALINE IRON NANOPARTICLES ORR SPHERES