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Atomization driven crystalline nanocarbon based single-atom catalysts for superior oxygen electroreduction

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Title
Atomization driven crystalline nanocarbon based single-atom catalysts for superior oxygen electroreduction
Author(s)
Jung, Jae Young; Jin, Haneul; Kim, Min Woo; Sungjun Kim; Kim, Jeong-Gil; Kim, Pil; Yung-Eun Sung; Yoo, Sung Jong; Kim, Nam Dong
Publication Date
2023-04
Journal
Applied Catalysis B: Environmental, v.323
Publisher
Elsevier BV
Abstract
© 2022 The AuthorsAtom-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 modulates 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.
URI
https://pr.ibs.re.kr/handle/8788114/13696
DOI
10.1016/j.apcatb.2022.122172
ISSN
0926-3373
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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