SCHEDULED MAINTENANCE
Electrical field facilitates selective transport of CO2 through a laminated MoS2 supported ionic liquid membrane†
Abstract
Ionic liquid (IL), a neutral assembly of charged ions, is a potential material for CO2 capture and storage. The practicality of IL can be improved by confining it into porous substrates and nanopores, which will further enhance the performance of IL by changing its structure. Additionally, an external electric field (EEF) should also influence the IL structure through its charged components. In this work, we applied an EEF on a MoS2 supported ionic liquid membrane (MoS2-SILM) to selectively facilitate CO2 transport by the dual influence of MoS2 nanochannel and EEF. The redistribution of nanoconfined IL under an EEF resulted in the increase in free volume of IL and decrease in anion–cation interactions, which led to the enhancement of CO2 solubility and diffusion, and further, the permeance. Compared with the MoS2-SILM without an EEF, the CO2 permeance was enhanced from 89 GPU to 200 GPU, and the selectivity of CO2/H2, CO2/CH4 and CO2/N2 was also enlarged 2–3 times. An interesting phenomenon was the asymmetric CO2 separation performance influenced by the CO2 adsorbed on MoS2 nanosheets under a positive and negative EEF, which may establish a new strategy to design high-performance gas separation membranes.
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