抄録
Distinct from inert bulk gold, nanoparticulate gold has been found to possess remarkable catalytic activity towards oxidation reactions. The catalytic performance of nanoparticulate gold strongly depends on size and support, and catalytic activity usually cannot be observed at characteristic sizes larger than 5ĝ‰nm. Interestingly, significant catalytic activity can be retained in dealloyed nanoporous gold (NPG) even when its feature lengths are larger than 30-nm. Here we report atomic insights of the NPG catalysis, characterized by spherical-aberration-corrected transmission electron microscopy (TEM) and environmental TEM. A high density of atomic steps and kinks is observed on the curved surfaces of NPG, comparable to 3-5nm nanoparticles, which are stabilized by hyperboloid-like gold ligaments. In situ TEM observations provide compelling evidence that the surface defects are active sites for the catalytic oxidation of CO and residual Ag stabilizes the atomic steps by suppressing {111} faceting kinetics.
本文言語 | English |
---|---|
ページ(範囲) | 775-780 |
ページ数 | 6 |
ジャーナル | Nature Materials |
巻 | 11 |
号 | 9 |
DOI | |
出版ステータス | Published - 2012 9月 |
外部発表 | はい |
ASJC Scopus subject areas
- 化学 (全般)
- 材料科学(全般)
- 凝縮系物理学
- 材料力学
- 機械工学