Time resolved x-ray absorption spectroscopy studies of the oxidation state and the structural environment of copper in zeolite CuNaY during hydrogen treatment

1992 ◽  
Author(s):  
Michael Hagelstein ◽  
Sabine Cunis ◽  
Peter Rabe ◽  
Rolf Piffer ◽  
Ronald Frahm
Keyword(s):  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Hydrogen Treatment ◽  
Time Resolved ◽  
X Ray ◽  
Structural Environment ◽  
Spectroscopy Studies ◽  
X Ray Absorption

scholarly journals Time-Resolved X-ray Absorption Spectroscopy in (Photo)Electrochemistry

Surfaces ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 138-150 ◽  
Author(s):  
Martina Fracchia ◽  
Paolo Ghigna ◽  
Alberto Vertova ◽  
Sandra Rondinini ◽  
Alessandro Minguzzi
Keyword(s):  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Time Resolution ◽  
Local Structure ◽  
Future Perspectives ◽  
Time Resolved ◽  
X Ray ◽  
Fixed Energy ◽  
Complete Survey ◽  
X Ray Absorption

This minireview aims at providing a complete survey concerning the use of X-ray absorption spectroscopy (XAS) for time-resolved studies of electrochemical and photoelectrochemical phenomena. We will see that time resolution can range from the femto-picosecond to the second (or more) scale and that this joins the valuable throughput typical of XAS, which allows for determining the oxidation state of the investigated element, together with its local structure. We will analyze four different techniques that use different approaches to exploit the in real time capabilities of XAS. These are quick-XAS, energy dispersive XAS, pump & probe XAS and fixed-energy X-ray absorption voltammetry. In the conclusions, we will analyze possible future perspectives for these techniques.

scholarly journals Operando tracking of oxidation-state changes by coupling electrochemistry with time-resolved X-ray absorption spectroscopy demonstrated for water oxidation by a cobalt-based catalyst film

2021 ◽  
Author(s):  
Chiara Pasquini ◽  
Si Liu ◽  
Petko Chernev ◽  
Diego Gonzalez-Flores ◽  
Mohammad Reza Mohammadi ◽  
...  
Keyword(s):  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Performance Optimization ◽  
Water Oxidation ◽  
Electrochemical Techniques ◽  
Time Resolved ◽  
Catalytic Current ◽  
X Ray ◽  
State Changes ◽  
X Ray Absorption

AbstractTransition metal oxides are promising electrocatalysts for water oxidation, i.e., the oxygen evolution reaction (OER), which is critical in electrochemical production of non-fossil fuels. The involvement of oxidation state changes of the metal in OER electrocatalysis is increasingly recognized in the literature. Tracing these oxidation states under operation conditions could provide relevant information for performance optimization and development of durable catalysts, but further methodical developments are needed. Here, we propose a strategy to use single-energy X-ray absorption spectroscopy for monitoring metal oxidation-state changes during OER operation with millisecond time resolution. The procedure to obtain time-resolved oxidation state values, using two calibration curves, is explained in detail. We demonstrate the significance of this approach as well as possible sources of data misinterpretation. We conclude that the combination of X-ray absorption spectroscopy with electrochemical techniques allows us to investigate the kinetics of redox transitions and to distinguish the catalytic current from the redox current. Tracking of the oxidation state changes of Co ions in electrodeposited oxide films during cyclic voltammetry in neutral pH electrolyte serves as a proof of principle. Graphical abstract

scholarly journals A setup for ultrafast time-resolved x-ray absorption spectroscopy

2004 ◽  
Vol 75 (1) ◽  
pp. 24-30 ◽  
Author(s):  
Melanie Saes ◽  
Frank van Mourik ◽  
Wojciech Gawelda ◽  
Maik Kaiser ◽  
Majed Chergui ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Development of an experimental apparatus to observe ultrafast phenomena by tender X-ray absorption spectroscopy at PAL-XFEL

2022 ◽  
Vol 29 (1) ◽  
Author(s):  
Yujin Kim ◽  
Daewoong Nam ◽  
Rory Ma ◽  
Sangsoo Kim ◽  
Myung-jin Kim ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Spectroscopic Technique ◽  
Ultrafast Dynamics ◽  
Electronic Information ◽  
Time Resolved ◽  
X Ray ◽  
Experimental Apparatus ◽  
Technical Achievement ◽  
X Ray Absorption ◽  
Pal Xfel

Understanding the ultrafast dynamics of molecules is of fundamental importance. Time-resolved X-ray absorption spectroscopy (TR-XAS) is a powerful spectroscopic technique for unveiling the time-dependent structural and electronic information of molecules that has been widely applied in various fields. Herein, the design and technical achievement of a newly developed experimental apparatus for TR-XAS measurements in the tender X-ray range with X-ray free-electron lasers (XFELs) at the Pohang Accelerator Laboratory XFEL (PAL-XFEL) are described. Femtosecond TR-XAS measurements were conducted at the Ru L 3-edge of well known photosensitizer tris(bipyridine)ruthenium(II) chloride ([Ru(bpy)3]2+) in water. The results indicate ultrafast photoinduced electron transfer from the Ru center to the ligand, which demonstrates that the newly designed setup is applicable for monitoring ultrafast reactions in the femtosecond domain.

scholarly journals Time-resolved X-ray absorption spectroscopy of infrared-laser-induced temperature jumps in liquid water

2009 ◽  
Vol 96 (1) ◽  
pp. 11-18 ◽  
Author(s):  
G. Gavrila ◽  
K. Godehusen ◽  
C. Weniger ◽  
E. T. J. Nibbering ◽  
T. Elsaesser ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Liquid Water ◽  
Infrared Laser ◽  
Time Resolved ◽  
X Ray ◽  
Temperature Jumps ◽  
X Ray Absorption
Sign in / Sign up

Export Citation Format

Share Document