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 language | English |
|---|---|
| Pages (from-to) | 412-422 |
| Number of pages | 11 |
| Journal | Electrochimica Acta |
| Volume | 257 |
| DOIs | |
| Publication status | Published - 2017 Dec 10 |
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Keywords
- bimetallic nanocrystals
- core-shell structures
- electrocatalysts
- fuel cells
- graphene oxides
- oxygen reduction reaction
- synergistic effects
ASJC Scopus subject areas
- Chemical Engineering(all)
- Electrochemistry
Cite this
Fine-sized Pt nanoparticles dispersed on PdPt bimetallic nanocrystals with non-covalently functionalized graphene toward synergistic effects on the oxygen reduction reaction. / Cho, Kie Yong; Yeom, Yong Sik; Seo, Heun Young; Lee, Albert S.; Huy Do, Xuan; Hong, Jun Pyo; Jeong, Hae Kwon; Baek, Kyung Youl; Yoon, Ho Gyu.
In: Electrochimica Acta, Vol. 257, 10.12.2017, p. 412-422.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fine-sized Pt nanoparticles dispersed on PdPt bimetallic nanocrystals with non-covalently functionalized graphene toward synergistic effects on the oxygen reduction reaction
AU - Cho, Kie Yong
AU - Yeom, Yong Sik
AU - Seo, Heun Young
AU - Lee, Albert S.
AU - Huy Do, Xuan
AU - Hong, Jun Pyo
AU - Jeong, Hae Kwon
AU - Baek, Kyung Youl
AU - Yoon, Ho Gyu
PY - 2017/12/10
Y1 - 2017/12/10
N2 - 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.
AB - 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.
KW - bimetallic nanocrystals
KW - core-shell structures
KW - electrocatalysts
KW - fuel cells
KW - graphene oxides
KW - oxygen reduction reaction
KW - synergistic effects
UR - http://www.scopus.com/inward/record.url?scp=85031786928&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85031786928&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2017.10.075
DO - 10.1016/j.electacta.2017.10.075
M3 - Article
AN - SCOPUS:85031786928
VL - 257
SP - 412
EP - 422
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -