Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 28, Pages 23302-23308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04410
Keywords
carbon nano-onion; islands-by-islands composite; curved structure; electrocatalyst; oxygen reduction
Funding
- MOTIE (Materials & components (KEIT) [10062092]
- Regional (MAT) [R0004244, R0005041]
- MOE (BK21Plus) [10Z20130011057]
- UNIST, Korea [1.160004.01]
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Geometry of carbon supports significantly affected electrochemical durability of Pt/C (platinum electrocatalyst supported by carbon) for oxygen reduction reaction (ORR). Carbon nano-onion (CNO) was used as the support, which is characterized by its nanosize (similar to Pt size) and high curvature. Superior ORR durability was guaranteed by Pt/CNO due to (1) its islands-by-islands configuration to isolate each Pt nanoparticle from its neighbors by CNO particles; (2) highly tortuous void structure of the configuration to suppress Ostwald ripening; and (3) the curvature-induced strong interaction between CNO and Pt. The finding that highly curved carbon surface encourages electron donation to catalysts was first reported.
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