Evolution of 3D nanoporosity and morphology in selectively dealloying ternary Au55Cu25Si20 metallic glass ribbon with enhanced alcohol electro-oxidation performance

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Pak Man Yiu
  • Guangcun Shan
  • Tamaki Shibayama
  • Seiichi Watanabe
  • Masato Ohnuma

Detail(s)

Original languageEnglish
Pages (from-to)18846-18856
Journal / PublicationNanoscale
Volume10
Issue number39
Early online date24 Sep 2018
Publication statusPublished - 21 Oct 2018

Abstract

Current fabrication methods of nanoporous gold (NPG) mainly rely on dealloying Ag-Au binary crystalline precursors, typically Ag65Au35, with the "dealloying threshold" or "parting limit" above 55 at%. Here we report a simple chemical dealloying process, through selective dissolution of one element from a Au55Cu25Si20 metallic glass ribbon with low 'parting limit', and a novel peculiar three-dimensional 'cone shaped protrusion' nanoporous structure which has never been reported before. In this structure, a metastable gold silicide formed in the initial dealloying stage was decomposed into gold nanoparticles and amorphous SiOx in the later coarsening stage. Our finding provides insights into the underlying relationship between 'parting limit' and atomic level structure of metallic glass. Comprehensive discussions on the porosity evolution stages as well as the correlation between the porous 'cone shaped protrusion' development and potential energy landscape are made in this report. The fabricated 3D NPG also exhibited excellent electro-oxidation catalytic ability attributed to the high density of low-coordinated atomic sites provided by the gold particle inside of 'cone shaped protrusion'.

Citation Format(s)

Evolution of 3D nanoporosity and morphology in selectively dealloying ternary Au55Cu25Si20 metallic glass ribbon with enhanced alcohol electro-oxidation performance. / Xu, Yi; Cheng, Junye; Yiu, Pak Man; Shan, Guangcun; Shibayama, Tamaki; Watanabe, Seiichi; Ohnuma, Masato; Shek, Chan-Hung.

In: Nanoscale, Vol. 10, No. 39, 21.10.2018, p. 18846-18856.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review