Oxidation and phase transfer of individual Cr-doped dendritic FeO_x particles visualized by full-field nano-XAFS spectroimaging

Abstract

Iron oxides with various compositions and polymorphs have been widely used as compounds that require reversible redox properties, such as catalysts. However, partial decomposition during phase transitions often causes the...

Comprehensive Operando Visualization of the Electrochemical Events in the Cathode/Anode Layers in Thin-Film-Type All-Solid-State Lithium-Ion Batteries

“…TXM–XAFS measurements were conducted at the BL37XU beamline at SPring-8 (Hyogo, Japan; 8.0 GeV, 100 mA). − X-rays emitted from an in-vacuum undulator were monochromated by a Si(111) double-crystal monochromator. Higher harmonics were rejected by two horizontal Ru-coated mirrors placed at the downstream monochromator at an angle of 4 mrad.…”

“…To correct sample drift and magnification rate changes caused by the chromatic aberration of the FZP, the absorption image stacks μt ( x , y , E ) were processed by laboratory-made image registration software . Then, Co or Fe K-edge XANES spectra were extracted from the region of interest (ROI) or each pixel of the μt ( x , y , E ) image stacks.…”