Fig. 5
a Fabrication process of large-area graphene membrane through the nanoporous carbon film-assisted transfer method. b The permeance of H2 for 8 different graphene membranes with different temperature condition. c H2/CH4 selectivity for 8 different graphene membranes with different temperature condition [30]. Adapted with permission from ref [30] under a Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/)