https://phys.org/news/2018-06-graphene-gas.html

Focusing on producing a gas separation device useful for carbon capture and storage, the researchers devised a protocol to separate CO2from H2. Hydrogen production, both from natural gas or in gasification of liquid or solid fuels, is often accompanied by the formation of a significant amount of CO2, which needs to be removed before the gas is used. Efficient separation of the CO2has greater potential for capture of this greenhouse gas.

Using a bottom up approach, the researchers deposited alternated layers of graphene oxide and a polymer poly(ethyleneimine) - PEI, using a self assembly method, to make the gas separation membrane. By using graphene oxide, (a water-soluble graphene material due to its oxidised nature), the team was able to deposit individual graphene oxide layers separated by the PEI.