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, Do Hyang Kim

Research output: Contribution to journalArticle

Abstract

The supersaturated Cu-Ag bimetallic nanoporous structure has been fabricated by dealloying of Mg 65 Cu 25-x Y 10 Ag x (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH 4 ) 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 Mg 65 Cu 25-x Y 10 Ag 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 NaBH 4 at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH 4 . The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg 65 Cu 21 Y 10 Ag 4 amorphous alloy exhibits the highest electrocatalytic property.

Original languageEnglish
Article number106488
JournalIntermetallics
Volume110
DOIs
Publication statusPublished - 2019 Jul 1

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Electrocatalysts
Amorphous alloys
Oxidation
Electrodes
Solubility
Electrochemical oxidation
Crystal microstructure
Sulfuric acid
Solid solutions
Sodium

All Science Journal Classification (ASJC) codes

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

Cite this

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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 Mg 65 Cu 25-x Y 10 Ag x (x = 0, 2, 4, 8) amorphous alloys and its electrocatalytic property for sodium borohydride (NaBH 4 ) 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 Mg 65 Cu 25-x Y 10 Ag 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 NaBH 4 at Cu-(Ag) electrodes is studied in a mixture solution of 2.0 M NaOH and 0.1 M NaBH 4 . The electrocatalytic property of nanoporous Cu-Ag bimetallic electrodes is higher than that of Cu monometallic electrode. The electrode dealloyed from Mg 65 Cu 21 Y 10 Ag 4 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. / Hyun, J. I.; Kong, K. H.; Kim, W. C.; Kim, W. T.; Kim, Do Hyang.

In: Intermetallics, Vol. 110, 106488, 01.07.2019.

Research output: Contribution to journalArticle

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