Tubular MXene/SS membranes for highly efficient H2/CO2 separation

Abstract Accurately constructing membranes based on two‐dimensional (2D) materials on commercial porous substrates remains a significant challenge for H 2 purification. In this work, a series of tubular 2D MXene membranes are prepared on commercial porous stainless steel substrates via fast electrophoretic deposition. Compared with other methods, such as filtration or drop coating, and so on. such preparation route shows the advantages of simple operation, high efficiency for membrane assembly (within 5 min) with attractive reproducibility, and ease for scale‐up. The tubular MXene membranes present excellent gas separation performance with hydrogen permeance of 1290 GPU and H 2 /CO 2 selectivity of 55. Furthermore, the membrane displays extremely stable performance during the long‐term test for more than 1250 h, and about 93% of the membranes from one batch have exceeded the DOE target for CO 2 capture. Most importantly, this work provides valuable referential significance for other 2D materials‐based membranes for future application development.