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 H2 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, etc. 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 H2/CO2 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 CO2 capture. Most importantly, this work provides a valuable referential significance for other types of 2D materials-based membranes for future application development.

Biomimetic Two-Dimensional Composited Membranes for Ion Separation and Desalination

“…The versatility of electrodeposition extends beyond MOF membranes and encompasses a wide range of functional 2D membrane. The MXene nanosheet is quickly prepared into a two-dimensional separation membrane by electrodeposition, and the controllable preparation of the membrane thickness is achieved by adjusting the deposition time at an appropriate concentration and voltage . Its ability to achieve precise control over membrane thickness, morphology, and composition makes it highly suitable for membrane separation.…”

Theoretical insights into He/CH4 separation by MXene nanopore

“…But the trade-off relationship between gas permeance and selectivity always hinders the further development of membrane separation technic. In recent years, two-dimensional (2D) materials with atomic thickness, such as graphene, [15][16][17] molybdenum disulfide (MoS 2 ), 18,19 h-BN, 20 MXene, [21][22][23] etc., as a kind of novel membrane materials provide a new way for highly efficient membrane separation. Because on one hand, ultrathin membranes can be aseembled using 2D nanosheets as bliuding blocks aiming for higher gas permeability, on the other hand, the precisely tuning the in-plane nanopores or interlayer spacing between adjacent 2D nanosheets also enhance selectivity.…”