1 Supplementary Information Hydrogen absorption in 1 nm Pd clusters confined in MIL-101(Cr) Abdelmalek Malouche 1 , Gabriela Blanita 2 , Dan Lupu 2 , Julie Bourgon 1 , Jaysen Nelayah 3 , Claudia Zlotea 1* *corresponding author email: claudia.zlotea@icmpe.cnrs.fr Table SI-1. Chemical analysis of x-Pd@MIL-101 (x = 5, 10, 15 and 20). Figure SI-1. TEM images and related particle size histograms for x-Pd@MIL-101 (x = 5, 10, 15 and 20). Figure SI-2. SEM images for x-Pd@MIL-101 (x = 5, 10, 15 and 20). Figure SI-3. Experimental and simulated XRD patterns of MIL-101. Figure SI-4. Thermogravimetric analysis of MIL-101 under air. Figure SI-5. Hydrogen absorption PCI curves for all composites expressed as equilibrium pressure vs. H/M. Figure SI-6. XAS spectra for Pd bulk under air (black) and Pd@MIL-101 under 1 bar He (blue) and H 2 (red) at 300 K. Figure SI-7. Comparison of the module of FT for bulk, 2.5 nm and 1 nm Pd at room temperature. Figure SI-8. Comparison between FT experimental (black) and fitted (red) by EXAFS refinements at Pd K edge for bulk Pd. Figure SI-9. Comparison between FT experimental (black) and fitted (red) by EXAFS refinements at Pd K edge for Pd@MIL-101 under He. Figure SI-10. Comparison between FT experimental (black) and fitted (red) by EXAFS refinements at Pd K edge for Pd@MIL-101 under H 2 . Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2017