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Gas Pulse-X-Ray Probe Ambient Pressure Photoelectron Spectroscopy with Submillisecond Time Resolution

Shavorskiy, Andrey LU ; D'Acunto, Giulio LU ; Boix De La Cruz, Virginia LU ; Scardamaglia, Mattia LU ; Zhu, Suyun LU ; Temperton, Robert H. LU ; Schnadt, Joachim LU orcid and Knudsen, Jan LU (2021) In ACS Applied Materials and Interfaces 13(40). p.47629-47641
Abstract

A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to... (More)

A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to demonstrate the capability of the setup to correlate the gas phase composition with that of the surface during transient supply of CO gas into an O2 stream. Thus, formation of both chemisorbed and oxide oxygen species was observed prior to CO gas perturbation. Also, the data indicated that both the Langmuir-Hinshelwood and Mars-van-Krevelen mechanisms play an important role in the oxidation of carbon monoxide under ambient conditions.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
APXPS, catalysis, CO oxidation, operando spectroscopy, time-resolved XPS
in
ACS Applied Materials and Interfaces
volume
13
issue
40
pages
13 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85117174577
  • pmid:34590812
ISSN
1944-8244
DOI
10.1021/acsami.1c13590
language
English
LU publication?
yes
additional info
Publisher Copyright: ©
id
5db9bca9-0e03-4147-8c78-33f5a0a5e77e
date added to LUP
2021-10-27 13:01:59
date last changed
2024-04-20 14:20:50
@article{5db9bca9-0e03-4147-8c78-33f5a0a5e77e,
  abstract     = {{<p>A setup capable of conducting gas pulse-X-ray probe ambient pressure photoelectron spectroscopy with high time resolution is presented. The setup makes use of a fast valve that creates gas pulses with an internal pressure in the mbar range and a rising edge of few hundreds of microseconds. A gated detector based on a fast camera is synchronized with the valve operation to measure X-ray photoemission spectra with up to 20 μs time resolution. The setup is characterized in several experiments in which the N2 gas is pulsed either into vacuum or a constant flow of another gas. The observed width of the pulse rising edge is 80 μs, and the maximum internal pulse pressure is ∼1 mbar. The CO oxidation reaction over Pt (111) was used to demonstrate the capability of the setup to correlate the gas phase composition with that of the surface during transient supply of CO gas into an O2 stream. Thus, formation of both chemisorbed and oxide oxygen species was observed prior to CO gas perturbation. Also, the data indicated that both the Langmuir-Hinshelwood and Mars-van-Krevelen mechanisms play an important role in the oxidation of carbon monoxide under ambient conditions. </p>}},
  author       = {{Shavorskiy, Andrey and D'Acunto, Giulio and Boix De La Cruz, Virginia and Scardamaglia, Mattia and Zhu, Suyun and Temperton, Robert H. and Schnadt, Joachim and Knudsen, Jan}},
  issn         = {{1944-8244}},
  keywords     = {{APXPS; catalysis; CO oxidation; operando spectroscopy; time-resolved XPS}},
  language     = {{eng}},
  number       = {{40}},
  pages        = {{47629--47641}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Applied Materials and Interfaces}},
  title        = {{Gas Pulse-X-Ray Probe Ambient Pressure Photoelectron Spectroscopy with Submillisecond Time Resolution}},
  url          = {{http://dx.doi.org/10.1021/acsami.1c13590}},
  doi          = {{10.1021/acsami.1c13590}},
  volume       = {{13}},
  year         = {{2021}},
}