Fine-sized Pt nanoparticles dispersed on PdPt bimetallic nanocrystals with non-covalently functionalized graphene toward synergistic effects on the oxygen reduction reaction

Title
Fine-sized Pt nanoparticles dispersed on PdPt bimetallic nanocrystals with non-covalently functionalized graphene toward synergistic effects on the oxygen reduction reaction
Authors
백경열후이 도 쑤언알버트 이성수조계룡Yong Sik YeomJun Pyo HongHae-Kwon JeongHo Gyu YoonHeun Young Seo
Keywords
graphene oxides; bimetallic nanocrystals; electrocatalysts; core-shell structures; fuel cells; oxygen reduction reaction; synergistic effects
Issue Date
2017-12
Publisher
Electrochimica acta
Citation
VOL 257-422
Abstract
To data, combination of Pt-based bimetallic nanocrysatals and the graphene support have significantly contributed to enhance the oxygen reduction reaction (ORR) performance relative to electrocatalysts based on monometallic Pt nanoparticles (NPs) primarily due to the unique ligand effects and benefits of the carbon support. In this study, we propose a new structure of bimetallic electrocatalysts to realize the synergistic effects on the ORR performance through effective integration of the fine-sized Pt NPs, PdPt bimetallic nanocrystals, and non-covalently functionalized graphene with ionic polymers. The facile wet-chemical methods were applied to synthesize fine-sized (2-5 nm) spherical Pt NPs doped large-sized (20-50 nm) non-spherical PdPt bimetallic NPs on the electronically negative ionic polymer-functionalized graphene support (Pt-on-PdPt/fG). This Pt-on-PdPt/fG with synergistic effects based on enlarged active surface area, ligand, and interfacial linking effects, exhibits substantially enhanced ORR activity (specific activity: 1.89 mA cm(Pt)(-2) at 0.9 V-RHE) and durability in comparison to the commercial Pt/C (specific activity: 0.23 mA cm(Pt)(-2) at 0.9 V-RHE). To this end, the effective integration of newly designed fine-sized Pt NPs doped bimetallic nanocrystals and unique graphene supports with the well-interactive ability could be a good platform to develop the advanced electrocatalysts for the efficient ORR.
URI
http://pubs.kist.re.kr/handle/201004/66879
ISSN
0013-4686
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KIST Publication > Article
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