▎ 摘　　要

Ultrathin graphene oxide membranes using borate as both crosslinker of GO nanosheets and facilitated transport carrier of CO2 are designed and fabricated. The membranes exhibited high CO2 permeance up to 650 GPU and a CO2/CH4 selectivity of 75, due to the rational manipulation of the interlayer nanochannel size, sufficient facilitated transport carriers and high water content.