Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction

Mrinal Kanti Kabiraz; Bibi Ruqia; Jeonghyeon Kim; Haesol Kim; Hee Jin Kim; Youngmin Hong; Mi Ji Kim; Young Kyoung Kim; Chan Kim; Won Jae Lee; Wonkyun Lee; Gyo Hyun Hwang; Hyeong Cheol Ri; Hionsuck Baik; Hyung Suk Oh; Young Wook Lee; Lei Gao; Hongwen Huang; Seung Min Paek; Youn Jung Jo; Chang Hyuck Choi; Sang Woo Han; Sang Il Choi

doi:10.1021/acscatal.1c05766

Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction

Mrinal Kanti Kabiraz, Bibi Ruqia, Jeonghyeon Kim, Haesol Kim, Hee Jin Kim, Youngmin Hong, Mi Ji Kim, Young Kyoung Kim, Chan Kim, Won Jae Lee, Wonkyun Lee, Gyo Hyun Hwang, Hyeong Cheol Ri, Hionsuck Baik, Hyung Suk Oh, Young Wook Lee, Lei Gao, Hongwen Huang, Seung Min Paek, Youn Jung JoChang Hyuck Choi, Sang Woo Han, Sang Il Choi

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

38 Scopus citations

Abstract

Grain boundaries (GBs) are defects in crystal structures, which are in general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of the GBs for bimetallic platinum-cobalt (Pt-Co) nanocatalysts in the oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt-Co nanowires (Pt-Co GB-NWs) and single-crystalline Pt-Co nanowires (Pt-Co SC-NWs) are synthesized. They have very similar diameters, Pt-to-Co ratios, and Pt-rich surface structures, except for the GB populations, which can be precisely controlled by applying an external magnetic field during their synthesis. The presence of GBs in Pt-Co NWs promotes Co leaching at an applied electrochemical potential, inducing significant changes in the surface Pt-to-Co ratio. The resulting Pt-Co GB-NWs perform only half the ORR activity compared with the Pt-Co SC-NWs. As a result, it is revealed that the surface GB sites are deactivated by causing elemental leaching and may not act as an ORR promoter for the Pt-Co nanowire catalyst.

Original language	English
Pages (from-to)	3516-3523
Number of pages	8
Journal	ACS Catalysis
Volume	12
Issue number	6
DOIs	https://doi.org/10.1021/acscatal.1c05766
State	Published - 18 Mar 2022

Keywords

cobalt
grain boundary
nanowire
oxygen reduction reaction
platinum

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10.1021/acscatal.1c05766

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Kabiraz, M. K., Ruqia, B., Kim, J., Kim, H., Kim, H. J., Hong, Y., Kim, M. J., Kim, Y. K., Kim, C., Lee, W. J., Lee, W., Hwang, G. H., Ri, H. C., Baik, H., Oh, H. S., Lee, Y. W., Gao, L., Huang, H., Paek, S. M., ... Choi, S. I. (2022). Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction. ACS Catalysis, 12(6), 3516-3523. https://doi.org/10.1021/acscatal.1c05766

@article{c9fe13bbdff2473392ae0e32239c4442,

title = "Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction",

abstract = "Grain boundaries (GBs) are defects in crystal structures, which are in general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of the GBs for bimetallic platinum-cobalt (Pt-Co) nanocatalysts in the oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt-Co nanowires (Pt-Co GB-NWs) and single-crystalline Pt-Co nanowires (Pt-Co SC-NWs) are synthesized. They have very similar diameters, Pt-to-Co ratios, and Pt-rich surface structures, except for the GB populations, which can be precisely controlled by applying an external magnetic field during their synthesis. The presence of GBs in Pt-Co NWs promotes Co leaching at an applied electrochemical potential, inducing significant changes in the surface Pt-to-Co ratio. The resulting Pt-Co GB-NWs perform only half the ORR activity compared with the Pt-Co SC-NWs. As a result, it is revealed that the surface GB sites are deactivated by causing elemental leaching and may not act as an ORR promoter for the Pt-Co nanowire catalyst.",

keywords = "cobalt, grain boundary, nanowire, oxygen reduction reaction, platinum",

author = "Kabiraz, {Mrinal Kanti} and Bibi Ruqia and Jeonghyeon Kim and Haesol Kim and Kim, {Hee Jin} and Youngmin Hong and Kim, {Mi Ji} and Kim, {Young Kyoung} and Chan Kim and Lee, {Won Jae} and Wonkyun Lee and Hwang, {Gyo Hyun} and Ri, {Hyeong Cheol} and Hionsuck Baik and Oh, {Hyung Suk} and Lee, {Young Wook} and Lei Gao and Hongwen Huang and Paek, {Seung Min} and Jo, {Youn Jung} and Choi, {Chang Hyuck} and Han, {Sang Woo} and Choi, {Sang Il}",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors. Published by American Chemical Society.",

year = "2022",

month = mar,

day = "18",

doi = "10.1021/acscatal.1c05766",

language = "English",

volume = "12",

pages = "3516--3523",

journal = "ACS Catalysis",

issn = "2155-5435",

publisher = "American Chemical Society",

number = "6",

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Kabiraz, MK, Ruqia, B, Kim, J, Kim, H, Kim, HJ, Hong, Y, Kim, MJ, Kim, YK, Kim, C, Lee, WJ, Lee, W, Hwang, GH, Ri, HC, Baik, H, Oh, HS, Lee, YW, Gao, L, Huang, H, Paek, SM , Jo, YJ, Choi, CH, Han, SW & Choi, SI 2022, 'Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction', ACS Catalysis, vol. 12, no. 6, pp. 3516-3523. https://doi.org/10.1021/acscatal.1c05766

TY - JOUR

T1 - Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction

AU - Kabiraz, Mrinal Kanti

AU - Ruqia, Bibi

AU - Kim, Jeonghyeon

AU - Kim, Haesol

AU - Kim, Hee Jin

AU - Hong, Youngmin

AU - Kim, Mi Ji

AU - Kim, Young Kyoung

AU - Kim, Chan

AU - Lee, Won Jae

AU - Lee, Wonkyun

AU - Hwang, Gyo Hyun

AU - Ri, Hyeong Cheol

AU - Baik, Hionsuck

AU - Oh, Hyung Suk

AU - Lee, Young Wook

AU - Gao, Lei

AU - Huang, Hongwen

AU - Paek, Seung Min

AU - Jo, Youn Jung

AU - Choi, Chang Hyuck

AU - Han, Sang Woo

AU - Choi, Sang Il

PY - 2022/3/18

Y1 - 2022/3/18

N2 - Grain boundaries (GBs) are defects in crystal structures, which are in general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of the GBs for bimetallic platinum-cobalt (Pt-Co) nanocatalysts in the oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt-Co nanowires (Pt-Co GB-NWs) and single-crystalline Pt-Co nanowires (Pt-Co SC-NWs) are synthesized. They have very similar diameters, Pt-to-Co ratios, and Pt-rich surface structures, except for the GB populations, which can be precisely controlled by applying an external magnetic field during their synthesis. The presence of GBs in Pt-Co NWs promotes Co leaching at an applied electrochemical potential, inducing significant changes in the surface Pt-to-Co ratio. The resulting Pt-Co GB-NWs perform only half the ORR activity compared with the Pt-Co SC-NWs. As a result, it is revealed that the surface GB sites are deactivated by causing elemental leaching and may not act as an ORR promoter for the Pt-Co nanowire catalyst.

AB - Grain boundaries (GBs) are defects in crystal structures, which are in general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of the GBs for bimetallic platinum-cobalt (Pt-Co) nanocatalysts in the oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt-Co nanowires (Pt-Co GB-NWs) and single-crystalline Pt-Co nanowires (Pt-Co SC-NWs) are synthesized. They have very similar diameters, Pt-to-Co ratios, and Pt-rich surface structures, except for the GB populations, which can be precisely controlled by applying an external magnetic field during their synthesis. The presence of GBs in Pt-Co NWs promotes Co leaching at an applied electrochemical potential, inducing significant changes in the surface Pt-to-Co ratio. The resulting Pt-Co GB-NWs perform only half the ORR activity compared with the Pt-Co SC-NWs. As a result, it is revealed that the surface GB sites are deactivated by causing elemental leaching and may not act as an ORR promoter for the Pt-Co nanowire catalyst.

KW - cobalt

KW - grain boundary

KW - nanowire

KW - oxygen reduction reaction

KW - platinum

UR - http://www.scopus.com/inward/record.url?scp=85126656176&partnerID=8YFLogxK

U2 - 10.1021/acscatal.1c05766

DO - 10.1021/acscatal.1c05766

M3 - Article

AN - SCOPUS:85126656176

SN - 2155-5435

VL - 12

SP - 3516

EP - 3523

JO - ACS Catalysis

JF - ACS Catalysis

IS - 6

ER -

Understanding the Grain Boundary Behavior of Bimetallic Platinum-Cobalt Alloy Nanowires toward Oxygen Electro-Reduction

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