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. 2026 Aug 27;17:10285. doi: 10.1038/s41467-026-76704-z

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© The Author(s) 2026

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Fig. 2 — a Molecular structure of the H-cluster for [FeFe] hydrogenase. The shading indicates the products of H₂S degradation by hydrogenase. b Schematic illustration of the structural transformation from MIL-68(Fe) to AUL MIL-68(Fe) based on density functional theory (DFT) calculations. The dark blue, purple, red, gray, and white balls represent Fe, Na, O, C, and H atoms, respectively. c Fourier transform infrared (FT-IR) spectra of MIL-68(Fe) under various annealing conditions and d enlarged view of the low-frequency region in c. e Fourier transforms of experimental extended X-ray absorption fine structure (EXAFS) spectra, and f X-ray absorption near edge structure (XANES) profiles at the Fe K-edge for MIL-68(Fe) and AUL MIL-68(Fe). g Powder X-ray diffraction (PXRD) patterns of MIL-68(Fe) under various annealing conditions. h High-angle annular dark field (HAADF) images and energy-dispersive X-ray spectroscopy (EDS) elemental mapping analysis. The microscopic morphology was similar in the results of the two independent experiments. i Projected density of states (PDOS) and j high-resolution O 1 s X-ray photoelectron spectroscopy (XPS) spectra of MIL-68(Fe) and AUL MIL-68(Fe).