Dendrite-Embedded Platinum–Nickel Multiframes as Highly Active and Durable Electrocatalyst toward the Oxygen Reduction Reaction

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Title
Dendrite-Embedded Platinum–Nickel Multiframes as Highly Active and Durable Electrocatalyst toward the Oxygen Reduction Reaction
Author(s)
Hyukbu Kwon; Mrinal Kanti Kabiraz; Jongsik Park; Aram Oh; Hionsuck Baik; Sang-Il Choi; Kwangyeol Lee
Publication Date
2018-05
Journal
NANO LETTERS, v.18, no.5, pp.2930 - 2936
Publisher
AMER CHEMICAL SOC
Abstract
Pt-based nanoframe catalysts have been explored extensively due to their superior activity toward the oxygen reduction reaction (ORR). Herein, we report the synthesis of Pt−Ni multiframes, which exhibit the unique structure of tightly fused multiple nanoframes and reinforced by an embedded dendrite. Rapid reduction and deposition of Ni atoms on Pt−Ni nanodendrites induce the alloying/dealloying of Pt and Ni in the overall nanostructures. After chemical etching of Ni, the newly formed dendrite-embedded Pt−Ni multiframes show an electrochemically active surface area (ECSA) of 73.4 m2 gPt −1 and a mass ORR activity of 1.51 A mgPt −1 at 0.93 V, which is 30-fold higher than that of the state-of-the-art Pt/C catalyst. We suggest that high ECSA and ORR performances of dendrite-embedded Pt−Ni multiframes/C can be attributed to the porous nanostructure and numerous active sites exposed on surface grain boundaries and high-indexed facets. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/5284
ISSN
1530-6984
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
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