Kim, Sun Mi Lee, Hyosun Goddeti, Kalyan C. Kim, Sang Hoon Park, Jeong Young 2024-01-20T06:33:12Z 2024-01-20T06:33:12Z 2021-09-05 2015-07-16 1932-7447 https://pubs.kist.re.kr/handle/201004/125223 The role of charge transfer at the metaloxide interface is a long-standing issue in surface chemistry and heterogeneous catalysis. Previous studies have shown that the flow of hot electrons crossing metaloxide interfaces correlates with catalytic activity. In this study, we employed ceria-supported gold nanoparticles to identify a correlation between the catalytic activity of CO oxidation and hot electrons generated via light irradiation. We tuned the size of the Au nanoparticles by changing the discharge voltages used in the arc plasma deposition process, thus allowing us to investigate the influence of Au nanoparticle size on changes in catalytic activity. CO oxidation over the Au/CeOX catalysts was carried out, and we found that the activity of the Au nanoparticles increased as the size of the nanoparticles decreased, which is associated with the cationic character of the Au nanoparticles, as demonstrated by X-ray photoelectron spectroscopy analysis. We also show that the activity of the Au nanoparticles decreases under light irradiation and that smaller nanoparticles show a higher change of turnover frequency compared with larger ones, presumably due to the mean free path of the hot electrons. From these results, we conclude that the cationic property of the gold species, induced by interaction with the CeO2 support, and the flow of hot electrons generated on the interface during light irradiation are mainly responsible for the change in catalytic activity on the Au nanoparticles. English American Chemical Society LOW-TEMPERATURE OXIDATION CO OXIDATION AU/CEO2 CATALYSTS AU PLATINUM HYDROGEN SURFACE REACTIVITY MECHANISM CATIONS Photon-Induced Hot Electron Effect on the Catalytic Activity of Ceria-Supported Gold Nanoparticles Article 10.1021/acs.jpcc.5b03287 1 The Journal of Physical Chemistry C, v.119, no.28, pp.16020 - 16025 The Journal of Physical Chemistry C 119 28 16020 16025 scie scopus 000358337700028 2-s2.0-84937109718 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article LOW-TEMPERATURE OXIDATION CO OXIDATION AU/CEO2 CATALYSTS AU PLATINUM HYDROGEN SURFACE REACTIVITY MECHANISM CATIONS