In this study, continuous zirconium(IV)-based metal–organic framework (Zr-MOF) membranes were prepared. The pure-phase Zr-MOF (i.e., UiO-66) polycrystalline membranes were fabricated on alumina hollow fibers using an in situ solvothermal synthesis method. Single-gas permeation and ion rejection tests were carried out to confirm membrane integrity and functionality. The membrane exhibited excellent multivalent ion rejection (e.g., 86.3% for Ca²⁺, 98.0% for Mg²⁺, and 99.3% for Al³⁺) on the basis of size exclusion with moderate permeance (0.14 L m^–2 h^–1 bar^–1) and good permeability (0.28 L m^–2 h^–1 bar^–1 μm). Benefiting from the exceptional chemical stability of the UiO-66 material, no degradation of membrane performance was observed for various tests up to 170 h toward a wide range of saline solutions. The high separation performance combined with its outstanding water stability suggests the developed UiO-66 membrane as a promising candidate for water desalination.

A high‐performance, microtubular solid oxide fuel cell is developed using an improved electrolyte/anode dual‐layer hollow fiber fabricated via a novel coextrusion and co‐sintering technique. The technique allows control over the porosity of the anode, resulting in an increase in the power output to almost double what has been previously reported.