| Literature DB >> 18811156 |
Shuo Chen1, Paulo J Ferreira, Wenchao Sheng, Naoaki Yabuuchi, Lawrence F Allard, Yang Shao-Horn.
Abstract
Atomically resolved structures and compositions of Pt alloy nanoparticles were obtained using aberration-corrected high-angle dark field imaging, which was correlated to specific ORR activity based on a Pt surface area. The enhanced specific ORR activity (approximately 2 times relative to Pt) of acid-treated "Pt3Co" nanoparticles can be related to composition variations at the atomic scale and the formation of percolated Pt-rich and Pt-poor regions within individual particles. Upon annealing, we show direct evidence of surface Pt sandwich-segregation structures, which correspond to a specific ORR activity approximately 4 times relative to Pt.Entities:
Year: 2008 PMID： 18811156 DOI： 10.1021/ja802513y
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419