Fig. 5: Cation sieving experiments.

a Transmembrane conductivity of Me4N+ and Dodec4N+ performed by blank AAO membrane and QL-COF-2/AAO membrane with different mass of COF. Inset: the conductivity ratio of Me4N+ to Dodec4N+ across different membranes. b Transmembrane conductivity of six cations across blank AAO and QL-COF-2 (10) membranes. Error bars donate standard deviation.