Stabilization of Iron-Based Catalysts against Oxidation: An In Situ Ambient-Pressure X-ray Photoelectron Spectroscopy (AP-XPS) Study

ACS Catalysis ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 3639-3643 ◽  
Author(s):  
Yongchun Hong ◽  
Shiran Zhang ◽  
Franklin Feng Tao ◽  
Yong Wang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
X Ray ◽  
Iron Based ◽  
Xps Study ◽  
Iron Based Catalysts

scholarly journals In situ monitoring of the influence of water on DNA radiation damage by near-ambient pressure X-ray photoelectron spectroscopy

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Marc Benjamin Hahn ◽  
Paul M. Dietrich ◽  
Jörg Radnik
Keyword(s):  
Dna Damage ◽  
Radiation Damage ◽  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
In Situ Monitoring ◽  
Strong Increase ◽  
Oh Radicals ◽  
Strand Breaks ◽  
X Ray

AbstractIonizing radiation damage to DNA plays a fundamental role in cancer therapy. X-ray photoelectron-spectroscopy (XPS) allows simultaneous irradiation and damage monitoring. Although water radiolysis is essential for radiation damage, all previous XPS studies were performed in vacuum. Here we present near-ambient-pressure XPS experiments to directly measure DNA damage under water atmosphere. They permit in-situ monitoring of the effects of radicals on fully hydrated double-stranded DNA. The results allow us to distinguish direct damage, by photons and secondary low-energy electrons (LEE), from damage by hydroxyl radicals or hydration induced modifications of damage pathways. The exposure of dry DNA to x-rays leads to strand-breaks at the sugar-phosphate backbone, while deoxyribose and nucleobases are less affected. In contrast, a strong increase of DNA damage is observed in water, where OH-radicals are produced. In consequence, base damage and base release become predominant, even though the number of strand-breaks increases further.

scholarly journals In situ investigation of degradation at organometal halide perovskite surfaces by X-ray photoelectron spectroscopy at realistic water vapour pressure

2017 ◽  
Vol 53 (37) ◽  
pp. 5231-5234 ◽  
Author(s):  
Jack Chun-Ren Ke ◽  
Alex S. Walton ◽  
David J. Lewis ◽  
Aleksander Tedstone ◽  
Paul O'Brien ◽  
...  
Keyword(s):  
Water Vapour ◽  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Water Vapour Pressure ◽  
Lead Iodide ◽  
X Ray ◽  
In Situ Investigation ◽  
Organometal Halide Perovskite ◽  
Methylammonium Lead Iodide

Near-ambient-pressure X-ray photoelectron spectroscopy enables the study of the reaction of in situ-prepared methylammonium lead iodide (MAPI) perovskite at realistic water vapour pressures for the first time.

scholarly journals An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

2015 ◽  
Vol 174 ◽  
pp. 532-541 ◽  
Author(s):  
Benedetto Bozzini ◽  
Matteo Amati ◽  
Patrizia Bocchetta ◽  
Simone Dal Zilio ◽  
Axel Knop-Gericke ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Solid Oxide ◽  
Spectroscopy Study ◽  
Solid Oxide Electrolyte ◽  
X Ray ◽  
A Cell ◽  
Oxide Electrolyte

scholarly journals Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1000
Author(s):  
Norbert Köpfle ◽  
Kevin Ploner ◽  
Peter Lackner ◽  
Thomas Götsch ◽  
Christoph Thurner ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Photoelectron Spectroscopy ◽  
Batch Reactor ◽  
Ambient Pressure ◽  
Composite Layer ◽  
Reaction Rates ◽  
Near Surface ◽  
X Ray ◽  
Zro2 Phase

Starting from subsurface Zr0-doped “inverse” Pd and bulk-intermetallic Pd0Zr0 model catalyst precursors, we investigated the dry reforming reaction of methane (DRM) using synchrotron-based near ambient pressure in-situ X-ray photoelectron spectroscopy (NAP-XPS), in-situ X-ray diffraction and catalytic testing in an ultrahigh-vacuum-compatible recirculating batch reactor cell. Both intermetallic precursors develop a Pd0–ZrO2 phase boundary under realistic DRM conditions, whereby the oxidative segregation of ZrO2 from bulk intermetallic PdxZry leads to a highly active composite layer of carbide-modified Pd0 metal nanoparticles in contact with tetragonal ZrO2. This active state exhibits reaction rates exceeding those of a conventional supported Pd–ZrO2 reference catalyst and its high activity is unambiguously linked to the fast conversion of the highly reactive carbidic/dissolved C-species inside Pd0 toward CO at the Pd/ZrO2 phase boundary, which serves the role of providing efficient CO2 activation sites. In contrast, the near-surface intermetallic precursor decomposes toward ZrO2 islands at the surface of a quasi-infinite Pd0 metal bulk. Strongly delayed Pd carbide accumulation and thus carbon resegregation under reaction conditions leads to a much less active interfacial ZrO2–Pd0 state.

In situ work-function measurement during chemical transformation of MoS2 to MoO3 by ambient-pressure x-ray photoelectron spectroscopy

2D Materials ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 025014
Author(s):  
Dooyong Lee ◽  
Jae Hyuck Jang ◽  
Wooseok Song ◽  
Joonhee Moon ◽  
Yooseok Kim ◽  
...  
Keyword(s):  
Work Function ◽  
Chemical Transformation ◽  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Function Measurement ◽  
X Ray

scholarly journals An in situ near-ambient pressure X-ray photoelectron spectroscopy study of CO 2 reduction at Cu in a SOE cell

2017 ◽  
Vol 799 ◽  
pp. 17-25 ◽  
Author(s):  
Benedetto Bozzini ◽  
Matteo Amati ◽  
Claudio Mele ◽  
Axel Knop-Gericke ◽  
Erik Vesselli
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ambient Pressure ◽  
Spectroscopy Study ◽  
X Ray

scholarly journals In situ investigation of dissociation and migration phenomena at the Pt/electrolyte interface of an electrochemical cell

2015 ◽  
Vol 6 (10) ◽  
pp. 5635-5642 ◽  
Author(s):  
Yeuk Ting Law ◽  
Spyridon Zafeiratos ◽  
Stylianos G. Neophytides ◽  
Alin Orfanidi ◽  
Dominique Costa ◽  
...  
Keyword(s):  
Double Layer ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Cell ◽  
Ambient Pressure ◽  
Liquid Electrolyte ◽  
X Ray ◽  
Electrolyte Interface ◽  
In Situ Investigation ◽  
And Migration

Using near ambient pressure X-ray photoelectron spectroscopy we probe in situ the double layer at the Pt/liquid electrolyte interface.

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