Understanding of binding energy calibration in XPS of lanthanum oxide by in situ treatment
Li, Jerry Pui Ho1; Zhou, Xiaohong1; Pang, Yaoqi1; Zhu, Liang1; Vovk, Evgeny I.1; Cong, Linna1; van Bavel, Alexander P.2; Li, Shenggang1; Yang, Yong1
2019-10-28
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume21Issue:40Pages:22351-22358
DOI10.1039/c9cp04187g
AbstractRare earth oxides have seen increased usage over the years in batteries and catalysts. Due to their unique electronic properties, they are the subject of fundamental and practical interest. However, the complexity in their electronic structures makes unambiguous characterization, such as X-ray photoelectron spectroscopy (XPS), very challenging. Lanthanum oxide (La2O3) has attracted special attention as a promising catalyst for the oxidative coupling of methane (OCM) reaction. In this work, a new and reliable way of XPS calibration is developed by applying various in situ preparations for a nanorod La2O3 catalyst to intentionally form different lanthanum compounds, followed by XPS characterization and corroboration with first principles calculations. To form different compounds, five sample treatments were performed including heating in vacuum and treatment with O-2, CH4, CO2, and H2O, which are all relevant to OCM reaction conditions. Adventitious carbon or lattice oxygen, as conventional calibration standard species for energy scale, is only suitable for one or few in situ prepared surfaces. Our results also clearly demonstrate the vital difference between performing the ex situ analysis after exposure of the sample to the atmosphere and the in situ analysis. By carefully comparing the spectra of various photoemission peaks of different compounds, we conclude that the binding energy of 102.2 eV for the La 4d(7/2) peak can be used as the internal calibration standard for all considered samples. Furthermore, different oxygen species were unambiguously identified by matching the oxygen 1s binding energies from the in situ measurements and first principles predictions.
Indexed BySCI
Language英语
Funding ProjectShell Foundation[PT66201] ; Shell Foundation[PT32281]
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS IDWOS:000491079900014
PublisherROYAL SOC CHEMISTRY
EISSN1463-9084
WOS KeywordRAY PHOTOELECTRON-SPECTROSCOPY ; CARBON-DIOXIDE ; THIN-FILMS ; LA2O3 ; CATALYSTS ; METHANE ; LA(OH)(3) ; LA2O2CO3 ; METAL
Original Document TypeArticle
Citation statistics
Cited Times [WOS]:0   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://kms.shanghaitech.edu.cn/handle/2MSLDSTB/80515
Collection物质科学与技术学院_PI研究组_杨永组
物质科学与技术学院_特聘教授组_李圣刚组
物质科学与技术学院_硕士生
Corresponding AuthorVovk, Evgeny I.; Yang, Yong
Affiliation1.ShanghaiTech Univ, Sch Phys Sci & Technol, 100 Haike Rd, Shanghai 201210, Peoples R China
2.Shell Global Solut Int BV, NL-1031 CM Amsterdam, Netherlands
First Author AffilicationSchool of Physical Science and Technology
Corresponding Author AffilicationSchool of Physical Science and Technology
First Signature AffilicationSchool of Physical Science and Technology
Recommended Citation
GB/T 7714
Li, Jerry Pui Ho,Zhou, Xiaohong,Pang, Yaoqi,et al. Understanding of binding energy calibration in XPS of lanthanum oxide by in situ treatment[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2019,21(40):22351-22358.
APA Li, Jerry Pui Ho.,Zhou, Xiaohong.,Pang, Yaoqi.,Zhu, Liang.,Vovk, Evgeny I..,...&Yang, Yong.(2019).Understanding of binding energy calibration in XPS of lanthanum oxide by in situ treatment.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,21(40),22351-22358.
MLA Li, Jerry Pui Ho,et al."Understanding of binding energy calibration in XPS of lanthanum oxide by in situ treatment".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 21.40(2019):22351-22358.
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