Zr6–Cluster-Embedded ZIF-8 Membranes Fabricated by Electrochemical Deposition for CO2/N2 and CO2/CH4 Separation

Membrane-based separation technology holds great promise for CO 2 capture, yet conventional membranes are often constrained by the permeability-selectivity trade-off. In this study, we developed a zirconium-cluster (Zr 6 )-incorporated ZIF-8 membrane via an electrochemical synthesis strategy to address this limitation. The resulting Zr 6 @ZIF-8 composite membrane exhibits high crystallinity, a dense microstructure, and homogeneous dispersion of Zr 6 clusters within the ZIF-8 framework. The optimized Zr 6 @ZIF-8–2 membrane demonstrates outstanding CO 2 separation performance with a CO 2 permeance of up to 300.0 gas permeation unit and CO 2 /N 2 and CO 2 /CH 4 selectivities of 27.0 and 14.8, respectively. The Zr 6 clusters enable effective structural regulation of ZIF-8 membranes, resulting in enhanced CO 2 separation performance and leading to improved diffusion selectivity. Furthermore, the membrane shows a stable separation performance under varying feed pressures and temperatures, along with excellent long-term operational stability. This work provides an effective electrochemical approach for fabricating high-performance MOF-based membranes, offering a promising candidate for industrial CO 2 capture and natural-gas purification.