ABSTRACT: Large-scale fabrication of MXene films is in high demand for various applications, but it remains difficult to meet industrial requirements. In this study, we develop a slot-die coating method for the preparation of large-area MXene membranes. The technique allows the fabrication of continuous and scalable coatings with a rapid coating speed of 6 mm s‒1. The thickness can be readily controlled from the nanometer scale to the micrometer scale, and the alignment of the nanosheet is enhanced by the shear force of the slot-die head. Molecular separation experiments employing a film with a thickness of approximately 100 nm are performed. A nanofiltration performance with water permeance of 190 LMH/bar and molecular weight cut-off of 269 Da is achieved, surpassing previously reported results obtained using MXene-based nanofiltration membranes. The stability of the membrane is highlighted by its nanofiltration performance of 30 days under harsh oxidizing conditions, which is the longest operation ever achieved for a 2D material-based membrane. The extraordinary stability of the film suggests its high potential for industrial and practical applications. The anti-oxidizing phenomena can be attributed to self-protection of the MXene surface by adsorbed organic molecules, which are particularly stabilized with positively charged molecules via chemisorption.  

 

논문정보 : ACS Nano, 2021, 15, 5, 8860–8869 (IF:14.588)
Published: 23 April 2021
DOI : 10.1021/acsnano.1c01448