Formation of nanoporous Cu-Ag by dealloying Mg-Cu-Y-Ag amorphous alloys and its electrocatalyst oxidation property

J. I. Hyun; K. H. Kong; W. C. Kim; W. T. Kim; D. H. Kim

doi:10.1016/j.intermet.2019.106488

Formation of nanoporous Cu-Ag by dealloying Mg-Cu-Y-Ag amorphous alloys and its electrocatalyst oxidation property

J. I. Hyun, K. H. Kong, W. C. Kim, W. T. Kim, D. H. Kim

Department of Materials Science and Engineering

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

12 Citations (Scopus)

Abstract

The supersaturated Cu-Ag bimetallic nanoporous structure has been fabricated by dealloying of Mg₆₅Cu_25-xY₁₀Ag_x (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH₄) oxidation has been evaluated. In order to increase solid solubility of Ag into Cu, the dealloying process is proceeded in higher concentration sulfuric acid aqueous solution for shorter immersion time. When Mg₆₅Cu_25-xY₁₀Ag_x amorphous alloys are dealloyed in 1.0 M solution for 30 s, the Cu-Ag bimetallic nanoporous structure in the form of solid solution is successfully obtained due to extended solid solubility in nm scale grain structure. Electrochemical oxidation of NaBH₄ at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH₄. The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg₆₅Cu₂₁Y₁₀Ag₄ amorphous alloy exhibits the highest electrocatalytic property.

Original language	English
Article number	106488
Journal	Intermetallics
Volume	110
DOIs	https://doi.org/10.1016/j.intermet.2019.106488
Publication status	Published - 2019 Jul

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea ( 2016R1A2B2013838 ).

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea (2016R1A2B2013838).

Publisher Copyright:
© 2019 Elsevier Ltd

All Science Journal Classification (ASJC) codes

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Formation of nanoporous Cu-Ag by dealloying Mg-Cu-Y-Ag amorphous alloys and its electrocatalyst oxidation property",

abstract = "The supersaturated Cu-Ag bimetallic nanoporous structure has been fabricated by dealloying of Mg65Cu25-xY10Agx (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH4) oxidation has been evaluated. In order to increase solid solubility of Ag into Cu, the dealloying process is proceeded in higher concentration sulfuric acid aqueous solution for shorter immersion time. When Mg65Cu25-xY10Agx amorphous alloys are dealloyed in 1.0 M solution for 30 s, the Cu-Ag bimetallic nanoporous structure in the form of solid solution is successfully obtained due to extended solid solubility in nm scale grain structure. Electrochemical oxidation of NaBH4 at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH4. The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg65Cu21Y10Ag4 amorphous alloy exhibits the highest electrocatalytic property.",

author = "Hyun, {J. I.} and Kong, {K. H.} and Kim, {W. C.} and Kim, {W. T.} and Kim, {D. H.}",

note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea ( 2016R1A2B2013838 ). Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea (2016R1A2B2013838). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

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AU - Hyun, J. I.

AU - Kong, K. H.

AU - Kim, W. C.

AU - Kim, W. T.

AU - Kim, D. H.

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea ( 2016R1A2B2013838 ). Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation by the Ministry of Science, ICT (Information & Communication Technology) and Future Planning, Korea (2016R1A2B2013838). Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/7

Y1 - 2019/7

N2 - The supersaturated Cu-Ag bimetallic nanoporous structure has been fabricated by dealloying of Mg65Cu25-xY10Agx (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH4) oxidation has been evaluated. In order to increase solid solubility of Ag into Cu, the dealloying process is proceeded in higher concentration sulfuric acid aqueous solution for shorter immersion time. When Mg65Cu25-xY10Agx amorphous alloys are dealloyed in 1.0 M solution for 30 s, the Cu-Ag bimetallic nanoporous structure in the form of solid solution is successfully obtained due to extended solid solubility in nm scale grain structure. Electrochemical oxidation of NaBH4 at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH4. The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg65Cu21Y10Ag4 amorphous alloy exhibits the highest electrocatalytic property.

AB - The supersaturated Cu-Ag bimetallic nanoporous structure has been fabricated by dealloying of Mg65Cu25-xY10Agx (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH4) oxidation has been evaluated. In order to increase solid solubility of Ag into Cu, the dealloying process is proceeded in higher concentration sulfuric acid aqueous solution for shorter immersion time. When Mg65Cu25-xY10Agx amorphous alloys are dealloyed in 1.0 M solution for 30 s, the Cu-Ag bimetallic nanoporous structure in the form of solid solution is successfully obtained due to extended solid solubility in nm scale grain structure. Electrochemical oxidation of NaBH4 at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH4. The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg65Cu21Y10Ag4 amorphous alloy exhibits the highest electrocatalytic property.

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Formation of nanoporous Cu-Ag by dealloying Mg-Cu-Y-Ag amorphous alloys and its electrocatalyst oxidation property

Abstract

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