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Title: The Atomic AXAFS and XANES Techniques as Applied to Heterogeneous Catalysis and Electrocatalysis

Abstract

X-Ray absorption spectroscopy (XAFS) is an attractive in situ and in operando technique. In recent years, the more conventional extended X-ray absorption fine structure (EXAFS) data analysis technique has been complemented by two newer analysis methods: the 'atomic' XAFS (AXAFS) technique, which analyzes the scattering from the absorber atom itself, and the {Delta}{mu} XANES technique, which uses a difference method to isolate the changes in the X-ray absorption near edge structure (XANES) due to adsorbates on a metal surface. With AXAFS it is possible to follow the electronic effect a support has on a metal particle; with {Delta}{mu} XANES it is possible to determine the adsorbate, the specific adsorption sites and adsorbate coverage on a metal catalyst. This unprecedented new information helps a great deal to unravel the complex kinetic mechanisms operating in working reactors or fuelcell systems. The fundamental principles and methodology for applying the AXAFS and {Delta}{mu} XANES techniques are given here, and then specific applications are summarized, including H adsorption on supported Pt in the gas phase, wateractivation at a Pt cathode and methanol oxidation at a Pt anode in an electrochemical cell, sulfur oxidation on Pt, and oxygenreduction on a Au/SnO{sub x} cathode. Finally, the futuremore » outlook for time and/or space resolved applications of these techniques is contemplated.« less

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Sponsoring Org.:
DOE - OFFICE OF SCIENCE
OSTI Identifier:
1020019
Report Number(s):
BNL-95865-2011-JA
Journal ID: ISSN 1463-9076; TRN: US201116%%3
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Physical Chemistry Chemical Physics
Additional Journal Information:
Journal Volume: 12; Journal Issue: 21; Journal ID: ISSN 1463-9076
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; ABSORPTION; ABSORPTION SPECTROSCOPY; ADSORPTION; ANODES; ATOMS; CATHODES; DATA ANALYSIS; ELECTROCHEMICAL CELLS; FINE STRUCTURE; HETEROGENEOUS CATALYSIS; KINETICS; METHANOL; OXIDATION; SCATTERING; SULFUR; national synchrotron light source

Citation Formats

Ramaker, D, and Koningsberger, D. The Atomic AXAFS and XANES Techniques as Applied to Heterogeneous Catalysis and Electrocatalysis. United States: N. p., 2010. Web. doi:10.1039/b927120c.
Ramaker, D, & Koningsberger, D. The Atomic AXAFS and XANES Techniques as Applied to Heterogeneous Catalysis and Electrocatalysis. United States. https://doi.org/10.1039/b927120c
Ramaker, D, and Koningsberger, D. 2010. "The Atomic AXAFS and XANES Techniques as Applied to Heterogeneous Catalysis and Electrocatalysis". United States. https://doi.org/10.1039/b927120c.
@article{osti_1020019,
title = {The Atomic AXAFS and XANES Techniques as Applied to Heterogeneous Catalysis and Electrocatalysis},
author = {Ramaker, D and Koningsberger, D},
abstractNote = {X-Ray absorption spectroscopy (XAFS) is an attractive in situ and in operando technique. In recent years, the more conventional extended X-ray absorption fine structure (EXAFS) data analysis technique has been complemented by two newer analysis methods: the 'atomic' XAFS (AXAFS) technique, which analyzes the scattering from the absorber atom itself, and the {Delta}{mu} XANES technique, which uses a difference method to isolate the changes in the X-ray absorption near edge structure (XANES) due to adsorbates on a metal surface. With AXAFS it is possible to follow the electronic effect a support has on a metal particle; with {Delta}{mu} XANES it is possible to determine the adsorbate, the specific adsorption sites and adsorbate coverage on a metal catalyst. This unprecedented new information helps a great deal to unravel the complex kinetic mechanisms operating in working reactors or fuelcell systems. The fundamental principles and methodology for applying the AXAFS and {Delta}{mu} XANES techniques are given here, and then specific applications are summarized, including H adsorption on supported Pt in the gas phase, wateractivation at a Pt cathode and methanol oxidation at a Pt anode in an electrochemical cell, sulfur oxidation on Pt, and oxygenreduction on a Au/SnO{sub x} cathode. Finally, the future outlook for time and/or space resolved applications of these techniques is contemplated.},
doi = {10.1039/b927120c},
url = {https://www.osti.gov/biblio/1020019}, journal = {Physical Chemistry Chemical Physics},
issn = {1463-9076},
number = 21,
volume = 12,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2010},
month = {Fri Jan 01 00:00:00 EST 2010}
}