Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold

Takeshi Fujita, Tomoharu Tokunaga, Ling Zhang, Dongwei Li, Luyang Chen, Shigeo Arai, Yuta Yamamoto, Akihiko Hirata, Nobuo Tanaka, Yi Ding, Mingwei Chen

研究成果: Article

70 引用 (Scopus)

抄録

Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

元の言語English
ページ(範囲)1172-1177
ページ数6
ジャーナルNano Letters
14
発行部数3
DOI
出版物ステータスPublished - 2014 3 12
外部発表Yes

Fingerprint

Nanopores
Coarsening
Gold
Catalysis
catalysis
chemical reactions
gold
catalysts
Chemical reactions
atoms
catalytic activity
Surface segregation
Atoms
Catalysts
Catalytic oxidation
Carbon Monoxide
oxidation
Catalyst activity
defects
Metals

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

これを引用

Fujita, T., Tokunaga, T., Zhang, L., Li, D., Chen, L., Arai, S., ... Chen, M. (2014). Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. Nano Letters, 14(3), 1172-1177. https://doi.org/10.1021/nl403895s

Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. / Fujita, Takeshi; Tokunaga, Tomoharu; Zhang, Ling; Li, Dongwei; Chen, Luyang; Arai, Shigeo; Yamamoto, Yuta; Hirata, Akihiko; Tanaka, Nobuo; Ding, Yi; Chen, Mingwei.

:: Nano Letters, 巻 14, 番号 3, 12.03.2014, p. 1172-1177.

研究成果: Article

Fujita, T, Tokunaga, T, Zhang, L, Li, D, Chen, L, Arai, S, Yamamoto, Y, Hirata, A, Tanaka, N, Ding, Y & Chen, M 2014, 'Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold', Nano Letters, 巻. 14, 番号 3, pp. 1172-1177. https://doi.org/10.1021/nl403895s
Fujita T, Tokunaga T, Zhang L, Li D, Chen L, Arai S その他. Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. Nano Letters. 2014 3 12;14(3):1172-1177. https://doi.org/10.1021/nl403895s
Fujita, Takeshi ; Tokunaga, Tomoharu ; Zhang, Ling ; Li, Dongwei ; Chen, Luyang ; Arai, Shigeo ; Yamamoto, Yuta ; Hirata, Akihiko ; Tanaka, Nobuo ; Ding, Yi ; Chen, Mingwei. / Atomic observation of catalysis-induced nanopore coarsening of nanoporous gold. :: Nano Letters. 2014 ; 巻 14, 番号 3. pp. 1172-1177.
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AU - Tokunaga, Tomoharu

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AU - Chen, Luyang

AU - Arai, Shigeo

AU - Yamamoto, Yuta

AU - Hirata, Akihiko

AU - Tanaka, Nobuo

AU - Ding, Yi

AU - Chen, Mingwei

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AB - Dealloyed nanoporous metals have attracted much attention because of their excellent catalytic activities toward various chemical reactions. Nevertheless, coarsening mechanisms in these catalysts have not been experimentally studied. Here, we report in situ atomic-scale observations of the structural evolution of nanoporous gold during catalytic CO oxidation. The catalysis-induced nanopore coarsening is associated with the rapid diffusion of gold atoms at chemically active surface steps and the surface segregation of residual Ag atoms, both of which are stimulated by the chemical reaction. Our observations provide the first direct evidence that planar defects hinder nanopore coarsening, suggesting a new strategy for developing structurally stable and highly active heterogeneous catalysts.

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