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

71 引用 (Scopus)

抜粋

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

    フィンガープリント

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., Yamamoto, Y., Hirata, A., Tanaka, N., Ding, Y., & 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