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

Kie Yong Cho, Yong Sik Yeom, Heun Young Seo, Albert S. Lee, Xuan Huy Do, Jun Pyo Hong, Hae Kwon Jeong, Kyung Youl Baek, Ho Gyu Yoon

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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 cmPt −2 at 0.9 VRHE) and durability in comparison to the commercial Pt/C (specific activity: 0.23 mA cmPt −2 at 0.9 VRHE). 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.

Original languageEnglish
Pages (from-to)412-422
Number of pages11
JournalElectrochimica Acta
Volume257
DOIs
Publication statusPublished - 2017 Dec 10

Keywords

  • bimetallic nanocrystals
  • core-shell structures
  • electrocatalysts
  • fuel cells
  • graphene oxides
  • oxygen reduction reaction
  • synergistic effects

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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