期刊
NANO LETTERS
卷 13, 期 7, 页码 3073-3077出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl400919c
关键词
Gold; nanoparticle; CeO2; interface; heterogeneous catalysis; in situ environmental TEM
类别
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [19001005]
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
Aberration-corrected environmental transmission electron microscopy (ETEM) proved that catalytically active gold nanoparticles (AuNPs) move reversibly and stepwise by approximately 0.09 nm on a cerium oxide (CeO2) support surface at room temperature and in a reaction environment. The lateral displacements and rotations occur back and forth between equivalent sites, indicating that AuNPs are loosely bound to oxygen-terminated CeO2 and may migrate on the surface with low activation energy. The AuNPs are likely anchored to oxygen-deficient sites. Observations indicate that the most probable activation sites in gold nanoparticulate catalysts, which are the perimeter interfaces between an AuNP and a support, are not structurally rigid.
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