journal article·2022-06-23Open access

Revisiting Oxygen Adsorption on Ir(100)

Xu Cao, Chunli Liu, Tianfu Zhang, Qian Xu, Dongling Zhang, Xiaotong Liu, Haijun Jiao, Xiaodong Wen, Yong Yang, Yongwang Li, J. W. Niemantsverdriet, Junfa Zhu

The Journal of Physical Chemistry C· Volume 126· Issue 24

Abstract

The adsorption and dissociation of O 2 on Ir(100) has been studied with X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and scanning tunneling microscopy together with density functional theory calculations. At low coverage, XPS shows a single O 1s peak at 530.6 eV, associated with bridged O atoms in an Ir(100)–(3 × 1)–O structure. At saturation coverage, an additional peak at 529.5 eV appears, accompanied by an Ir(100)–(2 × 1)–O structure. The O 1s peak at 530.6 eV is assigned to oxygen atoms adsorbed on bridge sites of Ir atoms, and the peak at 529.5 eV to oxygen atoms on fourfold hollow sites of Ir. Based on our detailed experimental and computational study, oxygen diffusion into the subsurface region can be ruled out. The present study provides new findings on an additional oxygen state of the O/Ir(100) system. It also provides evidence for the absence of subsurface oxygen in Ir, implying that some discussions on subsurface oxygen in the literature may be misleading.
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OpenAlex topics: Catalytic Processes in Materials Science · Advanced Chemical Physics Studies · Semiconductor materials and devices

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Affiliations

National Synchrotron Radiation Laboratory, Department of Chemical Physics and Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, People’s Republic of China

SynCat@Beijing and National Energy Center for Coal to Liquids, Synfuels China Technology Co., Ltd., Huairou District, Beijing 101407, People’s Republic of China

State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China

University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China

Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Information Science and Technology University, Beijing 100101, People’s Republic of China

Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein Strasse 29a, 18059 Rostock, Germany

Syngaschem BV, P.O. Box 6336, 5600 HH Eindhoven, The Netherlands

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Chinese Academy of Sciences

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