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

Hyukbu Kwon; Mrinal Kanti Kabiraz; Jongsik Park; Aram Oh; Hionsuck Baik; Sang Il Choi; Kwangyeol Lee

doi:10.1021/acs.nanolett.8b00270

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

Hyukbu Kwon, Mrinal Kanti Kabiraz, Jongsik Park, Aram Oh, Hionsuck Baik, Sang Il Choi, Kwangyeol Lee

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

131 Citations (Scopus)

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 g_Pt^-1 and a mass ORR activity of 1.51 A mg_Pt^-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.

Original language	English
Pages (from-to)	2930-2936
Number of pages	7
Journal	Nano Letters
Volume	18
Issue number	5
DOIs	https://doi.org/10.1021/acs.nanolett.8b00270
Publication status	Published - 2018 May 9

Bibliographical note

Funding Information:
This work was supported by IBS-R023-D1, NRF-2017R1A2B3005682, NRF-2016H1D5A1910726, KBSI project E37300, and Korea University Future Research Grant. The authors thank Korea Basic Science Institute (KBSI) for the usage of their HRTEM and ICP-AES instruments.

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

Platinum
electrocatalyst
multiframes
oxygen reduction reaction
porous nanostructure

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/acs.nanolett.8b00270

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title = "Dendrite-Embedded Platinum-Nickel Multiframes as Highly Active and Durable Electrocatalyst toward the Oxygen Reduction Reaction",

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.",

keywords = "Platinum, electrocatalyst, multiframes, oxygen reduction reaction, porous nanostructure",

author = "Hyukbu Kwon and Kabiraz, {Mrinal Kanti} and Jongsik Park and Aram Oh and Hionsuck Baik and Choi, {Sang Il} and Kwangyeol Lee",

note = "Funding Information: This work was supported by IBS-R023-D1, NRF-2017R1A2B3005682, NRF-2016H1D5A1910726, KBSI project E37300, and Korea University Future Research Grant. The authors thank Korea Basic Science Institute (KBSI) for the usage of their HRTEM and ICP-AES instruments. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

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AU - Kwon, Hyukbu

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AU - Oh, Aram

AU - Baik, Hionsuck

AU - Choi, Sang Il

AU - Lee, Kwangyeol

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PY - 2018/5/9

Y1 - 2018/5/9

N2 - 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.

AB - 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.

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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