“…UiO-66 is a MOF with Zr 6 O 4 (OH) 4 octahedral nodes that form lattices by 12-fold connection through 1,4-benzene-dicarboxylate (BDC) linkers (see Figures and ). UiO-66 has excellent chemical stability, mechanical stability, thermal stability, and water resistance, and it is widely used in the field of the host–guest chemistry for gas separation/adsorption, , fluorescence sensing, , catalysis, , water purification, and drug delivery. , UiO-66 forms a face-centered-cubic system that has 7.5 Å tetrahedral cages and 12 Å octahedral cages. , The zirconium ions in UiO-66 are not redox active, and this raises the question of how well alkali metals can be stored by interaction with the organic linkers. − …”