Probing Electrode Heterogeneity with 2D X‑ray Absorption Imaging
Abstract
Unlike traditional X-ray absorption spectroscopy (XAS), two-dimensional (2D) X-ray absorption imaging, which combines spatial and spectral resolution, enables the spatially resolved analysis of compositional and chemical reaction heterogeneity within a material. An X-ray absorption imaging system with a large field of view (FoV) and high spatial resolution allows for the visualization and investigation of the structure-activity relationships in reactive systems. In this study, a 2D MiniPIX detector was installed at the XAFS beamline at Elettra to investigate the differing reaction mechanisms of manganese hexacyanoferrate (MnHCF) in two distinct electrolytes. By analyzing the spatially resolved X-ray absorption near-edge structure (XANES) data collected at the Mn k-edge, the concentration maps as well as phase evolution and distribution images of manganese species were obtained. These results further clarify the role of the Mn2+ additive in aqueous Zn-ion batteries and the working mechanism of MnHCF in such systems.
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