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journal article·2019-01-01Open access

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, Hiroshi Kondoh, Do Young Noh, Bongjin Simon Mun

AIP Advances· Volume 9· Issue 1
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Source abstract

Abstract

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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Research context

OpenAlex topics: Catalytic Processes in Materials Science · Electronic and Structural Properties of Oxides · Catalysis and Oxidation Reactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Photon Science, Gwangju Institute of Science and Technology 1 , Gwangju 61005, Republic of Korea

Department of Chemistry, Keio University 2 , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan

Institute of Materials Structure Science, High Energy Accelerator Research Organization 3 , 1-1 Oho, Tsukuba 305-0801, Japan

Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement – Campus Pierre et Marie Curie 4 , F-75005 Paris, France

Synchrotron SOLEIL, L’Orme des Merisiers 5 , Saint-Aubin, F-91192 Gif-sur-Yvette, France

Advanced Light Source, Lawrence Berkeley National Laboratory 6 , Berkeley, California 94720, USA

Funding

Phton Facotry Program Advisory Committee · National Research Foundation of Korea · U.S. Department of Energy

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