Topic
XANES
About: XANES is a research topic. Over the lifetime, 7737 publications have been published within this topic receiving 188032 citations.
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01 Jan 2005-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
189 citations
TL;DR: In this paper, the in situ X-ray absorption fine structure (XAFS) technique was used to study the chemical states and structural changes accompanying the electrochemical Li deintercalation of Li1−x(Mn, M)2O4 (M=Cr, Co, Ni).
189 citations
TL;DR: X-ray absorption and X-ray photoelectron spectroscopy (XPS) analysis of copper sulfide precipitated from aqueous solution at ambient temperatures reveals the existence of a metastable primitive structure that ages to a structure with the characteristics of amorphous covellite as discussed by the authors.
189 citations
01 May 1995
TL;DR: In this paper, the authors used X-ray absorption spectroscopy and XPS to study the thermal degradation of poly(3,4-ethylenedioxythiophene tetrachloroferrate) (PEDT) and showed that after 48 h at 150°C due to baking and moisture irreversible structural changes in the polymer main chain occur.
Abstract: Oxidatively prepared poly(3,4-ethylenedioxythiophene tetrachloroferrate) (PEDT) has been characterized by X-ray absorption spectroscopy and XPS to study the thermal degradation of the polymer. XANES spectra were measured at the Electron Stretcher Accelerator ELSA in Bonn and compared with measurements made with the conventional XPS technique. These investigations show that after 48 h at 150°C due to baking and moisture irreversible structural changes in the polymer main chain occur. They were identified as a partial oxidation of the sulfur of the polymer backbone to the sulfate anion and the decomposition of the counter ion resulting in loss of conductivity. A possible degradation mechanism is presented.
187 citations
TL;DR: Under water gas shift reaction conditions the active form of gold comprises small metallic gold clusters in intimate contact with the oxide support, and density functional theory calculations are entirely consistent with this model.
Abstract: A combined experimental and theoretical investigation of the nature of the active form of gold in oxide-supported gold catalysts for the water gas shift reaction has been performed. In situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) experiments have shown that in the fresh catalysts the gold is in the form of highly dispersed gold ions. However, under water gas shift reaction conditions, even at temperatures as low as 100 °C, the evidence from EXAFS and XANES is only consistent with rapid, and essentially complete, reduction of the gold to form metallic clusters containing about 50 atoms. The presence of Au−Ce distances in the EXAFS spectra, and the fact that about 15% of the gold atoms can be reoxidized after exposure to air at 150 °C, is indicative of a close interaction between a fraction (ca. 15%) of the gold atoms and the oxide support. Density functional theory (DFT) calculations are entirely consistent with this model and suggest that an import...
186 citations