1.D.198.  The Mxene-Graphine oxide Membrane (MGOm) Family 

Two-dimensional MXenes have become a crucial topic in the field of ion transport, owing to their excellent electrochemical performance. Ouyang et al. 2022 presented a strategy for preparing a layered MXene-graphene oxide (GO) membrane via vacuum filtration, which endows the delaminated two-dimensional MXene-GO membrane (MGOm) with excellent electrical conductivity and chemical stability, achieving voltage-gated ion transport behavior. Owing to the presence of charges or dipoles within the membrane's channel, the movement of electrons or dipoles under the influence of a membrane potential is possible. By varying the transmembrane potential, the transition between the closed and open states of the voltage-gated ion channel can be adjusted. When a negative potential is applied at osmotic pressure, the force between the charged MGOm sheet and the cation (K+) is enhanced, promoting ion permeation. Conversely, the application of a positive potential attenuates electrostatic attraction, resulting in a decrease in ion permeability. In addition, the effects of MXene and GO with different modulation ratios on the voltage-gated ion transport have shown that when the modulation ratio of MXene : GO is 7 : 3, the optimal ion permeation rate is achieved. Thus, the conductive film with voltage-gated nanochannels is a promising alternative for ion transport, opening up new avenues for the further exploration of MXene materials in energy storage devices (Ouyang et al. 2022).



Ouyang, H., X. Hong, Z. Zhou, P. Xu, H. Tang, Z. Ma, Z. Wang, X. Liao, and L. He. (2022). Facile preparation of a MXene-graphene oxide membrane and its voltage-gated ion transport behavior. Phys Chem Chem Phys 24: 27157-27162.