| AVS 62nd International Symposium & Exhibition | |
| In-Situ Spectroscopy and Microscopy Focus Topic | Tuesday Sessions |
| Session IS-TuP |
| Session: | In-Situ Spectroscopy and Microscopy Poster Session |
| Presenter: | Qiang Liu, Lawrence Berkeley National Laboratory (LBNL) |
| Authors: | Q. Liu, Lawrence Berkeley National Laboratory (LBNL) B.H. Mao, Chinese Academy of Sciences E.J. Crumlin, Lawrence Berkeley National Laboratory (LBNL) Z. Liu, Chinese Academy of Science |
| Correspondent: | Click to Email |
Carbonaceous deposition is always observed in carbon-containing catalysis reactions on metal catalysts. This carbon deposition layer blocks the active sites of the metal catalyst and, therefore, inhibits the catalytic reaction. Recent research revealed that by depositing a graphene overlayer on metal catalyst the detrimental interaction between reactant gases and the metal catalysts can be weaken, thus resulting in a lowering of the activation energy barrier for the desired catalytic reaction. In order to probe the fundamental charge transfer processes between the as-grown graphene layer and the metal catalyst we present our studies of this system using operando ambient pressure X-ray Photoelectron Spectroscopy (APXPS), with synchrotron X-rays at the Advanced Light Source, Lawrence Berkeley National Laboratory. By intercalating gases (e.g. CO, O2) quasi-free-standing graphene can be prepared, which annulled the charge transfer between as the as-grown graphene and the metal. Using APXPS, we have studied the graphene-reactant and reactant-metal interactions under different temperature and pressure conditions. We will discuss the results from graphene-Cu and graphene-CuNi system under CO oxidation reaction and other reaction conditions.