Fig. 2: The evolution of chemical states of Co3O4 for different particle sizes as a function of thermal redox cycles. | Nature Communications

Fig. 2: The evolution of chemical states of Co3O4 for different particle sizes as a function of thermal redox cycles.

From: Operando X-ray imaging reveals size-dependent evolution of cobalt oxide thermochemical material during thermal redox cycles

Fig. 2: The evolution of chemical states of Co3O4 for different particle sizes as a function of thermal redox cycles.

(A–C) microparticles and (D–F) nanoparticles: (A, D) Fitted 2D XANES images reflecting the atomic ratio of Co in CoO phase at different temperatures and time points. (B, E) Enlarged view of (A–h) for microparticles and (D–g) for nanoparticles, highlighting particle heterogeneity in the region of interest (ROI) and corresponding XANES spectra, where μ indicates the X-ray attenuation. (C, F) Temperature profile during the in-situ experiment, indicating time points (a-p) for imaging data collection. Note that black color in the XANES images indicates a masked region where the sample amount is negligible. Source data are provided as a Source Data file.

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