(551a) Large-Area Single Layer Graphene Membrane By Crack-Free Transfer for Gas Mixture Separation
The membrane was stable during multiple cycles of heating and cooling, and at least up to moderate transmembrane pressure differences (7 bar). Attractive gas sieving performance (H2 permeance up to 4.1 x 10-7 mol m-2 s-1 Pa-1 with H2/CH4 selectivities up to 25) were achieved from graphene film with a minuscule porosity of 0.025%. Use of gas mixture feed did not reduce either the H2 permeance or the H2/CH4 separation selectivity. Finally, we report post-synthetic performance tuning of the graphene membrane by ozone-functionalization, improving H2 permeance (up to 300%) as well as H2/CH4 selectivities (up to 150%). Overall, the methods developed here can be instrumental to realize large-scale deployment of the nanoporous two-dimensional membrane.
- Jiang, D.-E., Cooper, V. R. & Dai, S. Porous graphene as the ultimate membrane for gas separation. Nano Lett. 9, (2009).
- Koenig, S. P., Wang, L., Pellegrino, J. & Bunch, J. S. Selective molecular sieving through porous graphene. Nat. Nanotechnol. 7, 728â732 (2012).
- Celebi, K. et al. Ultimate permeation across atomically thin porous graphene. Science 344, 289â92 (2014).
- Agrawal, K. et al., Single-Layer Graphene Membranes by Crack- Free Transfer for Gas Mixture Separation. Nat. Commun. 2018