Jae Young Jung Jin, Haneul Kim Min Woo Kim, Sungjun Jeong_Gil Kim Kim, Pil Sung, Yung-Eun Yoo, Sung Jong Kim, Nam Dong 2024-01-12T02:31:06Z 2024-01-12T02:31:06Z 2022-11-28 2023-04 0926-3373 https://pubs.kist.re.kr/handle/201004/75760 Atom-migration-trapping (AMT) is an effective and straightforward strategy for fabricating single-atom catalysts (SACs), but understanding the mechanism and effects of anchoring sites on AMT are formidable challenges. Here, we demonstrate that AMT phenomena occurs in crystalline porous nanocarbon, which allows development of highly efficient SACs via systematic investigation of atomization process and chemical state of active sites. An arc discharge-based bottom-up synthesis can generate an ideal porous nanocarbon with controllable nitrogen functionality, containing metal nanoparticles for AMT. Pre-formed N-functionalities in as-synthesized catalyst play important role in capturing single metal species, while additional ammonia treatment successfully modu-lates coordination geometry of active sites. The atomic cobalt catalyst exhibits superior oxygen reduction activity with remarkable power performance in single-cell experiments (752 mW cm-2), exceeding the reported Co-N atomic catalysts. Our findings provide not only new perspectives in AMT phenomena but also strategies to develop an efficient and practical SACs in energy conversion systems. English Elsevier BV Atomization driven crystalline nanocarbon based single-atom catalysts for superior oxygen electroreduction Article 10.1016/j.apcatb.2022.122172 1 Applied Catalysis B: Environmental, v.323 Applied Catalysis B: Environmental 323 Y scie scopus 000890427000001 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article Single atom catalysts Atom-migration-trapping M-Nx-C catalysts Oxygen reduction reaction Anion exchange membrane fuel cells