AIP Advances
(Jan 2019)
Operando study of Pd(100) surface during CO oxidation using ambient pressure x-ray photoemission spectroscopy
Youngseok Yu,
Dongwoo Kim,
Hojoon Lim,
Geonhwa Kim,
Yoobin E. Koh,
Daehyun Kim,
Kohei Ueda,
Satoru Hiwasa,
Kazuhiko Mase,
Fabrice Bournel,
Jean-Jacques Gallet,
François Rochet,
Ethan J. Crumlin,
Philip N. Ross Jr.,
Hiroshi Kondoh,
Do Young Noh,
Bongjin Simon Mun
Affiliations
Youngseok Yu
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Dongwoo Kim
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Hojoon Lim
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Geonhwa Kim
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Yoobin E. Koh
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Daehyun Kim
Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
Kohei Ueda
Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
Satoru Hiwasa
Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
Kazuhiko Mase
Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801, Japan
Fabrice Bournel
Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement – Campus Pierre et Marie Curie, F-75005 Paris, France
Jean-Jacques Gallet
Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement – Campus Pierre et Marie Curie, F-75005 Paris, France
François Rochet
Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement – Campus Pierre et Marie Curie, F-75005 Paris, France
Ethan J. Crumlin
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Philip N. Ross Jr.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Hiroshi Kondoh
Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
Do Young Noh
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
Bongjin Simon Mun
Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
DOI
https://doi.org/10.1063/1.5081066
Journal volume & issue
Vol. 9,
no. 1
pp.
015314
– 015314-8
Abstract
Read online
The surface chemical states of Pd(100) during CO oxidation were investigated using ambient pressure x-ray photoelectron spectroscopy and mass spectroscopy. Under the reactant ratio of CO/O2 = 0.1, i.e. an oxygen-rich reaction condition, the formation of surface oxides was observed with the onset of CO oxidation reaction at T = 525 K. As the reactant ratio (CO/O2) increased from 0.1 to 1.0, ∼ 90 % surface oxides remains on surface during the reaction. Upon the formation of surface oxides, the core level shift of oxygen gas phase peak was observed, indicating that change of surface work function. As CO oxidation takes places, i.e. making a transition from CO covered surface to the oxidic surface, the work functions of surface oxide on Pd(100) and Pt(110) display opposite behavior.
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