(387h) Single-Layer Graphene Membranes with a Record Performance in Hydrogen Purification and Carbon Capture
Herein, we reported several novel approaches to achieve record-high gas separation performance from single layer graphene-based membrane. A novel nanoporous-carbon-assisted graphene transfer technique was developed, enabling transfer of relatively large area single-layer graphene onto a macroporous support, hosting pores with pore-opening of 5 µm, without inducing cracks or tears.2 By decoupled pore-nucleation and pore-expansion strategy, a high pore-density (2.1 × 1012 pores/cm2) with a tight pore-size distribution was incorporated in single-layer graphene film, resulting in a record gas mixture separation performance (H2 permeance of 1340 to 6045 gas permeation units (GPU); H2/CH4 separation factor of 15.6 to 25.1; H2/C3H8 separation factor of 38.0 to 57.8).3 Furthermore, a novel millisecond-etching reactor was developed to realize higher pore-density on graphene film, where concentrated etching medium generated high-density pore nucleation while minimized the pore expansion due to the short-time treatment, leading to attractive separation performance from single-layer graphene film with CO2 permeance of 2626 GPU and CO2/CH4 selectivity of 20 and CO2/N2 selectivity over 20. Overall, we demonstrate that graphene-based membranes are indeed capable of reaching the predicted high performance in gas separation.
(1) Wang, L.; Boutilier, M. S. H.; Kidambi, P. R.; Jang, D.; Hadjiconstantinou, N. G.; Karnik, R. Fundamental Transport Mechanisms, Fabrication and Potential Applications of Nanoporous Atomically Thin Membranes. Nature Nanotechnology 2017, 12, 509â522.
(2) Huang, S.; Dakhchoune, M.; Luo, W.; Oveisi, E.; He, G.; Rezaei, M.; Zhao, J.; Alexander, D. T. L.; ZÃ¼ttel, A.; Strano, M. S.; Agrawal, K. V. Single-Layer Graphene Membranes by Crack-Free Transfer for Gas Mixture Separation. Nature Communications 2018, 9, 1â11.
(3) Zhao, J.; He, G.; Huang, S.; Villalobos, L. F.; Dakhchoune, M.; Bassas, H.; Oveisi, E.; Agrawal, K. V. Etching Nanopores in Single-Layer Graphene with an Angstrom Precision for High-Performance Gas Separation. Science Advances 2019, 5, eaav1851.