期刊
JOURNAL OF MEMBRANE SCIENCE
卷 642, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.119982
关键词
Membrane separation; H-2 separation; MXene; ZIF-8
资金
- NSFC [22022805, 22078107, 21861132013, 22008077]
- GuangDong Basic and Applied Basic Research Foundation [2019A1515110958]
A new freestanding MXene-ZIF-8 dual-layered membrane was reported for efficient hydrogen separation, synthesized rapidly using electrophoretic deposition and fast current-driven synthesis techniques. The membrane exhibited significantly improved gas separation performance within a short period of time.
As one of the green, renewable, and clean energy resources, hydrogen is widely developed and utilized throughout the world. Highly efficient membrane separation for hydrogen production is required to give promising gas permeance with enough H-2 selectivity. The membranes are desired to be produced in large-scale, fast and facile methods. Here we report for the first time a kind of freestanding MXene-ZIF-8 dual-layered membrane for hydrogen separation. Fast synthesis of such membranes is realized by combining electrophoretic deposition (EPD) and fast current-driven synthesis (FCDS), achieving the assemble of MXene layer and growth of ZIF-8 layer, respectively, overcoming the traditional time-consuming vacuum filtration methods and solvothermal synthesis. The MXene-ZIF-8 dual-layered membrane prepared within 20 min exhibits significantly improved gas separation performance, whose H-2/CO2 selectivity increases from 44 for the pristine MXene membrane to 77 with H-2 permeance of 5.97 x 10(-8) mol m(-2) s(-1) Pa-1. This concept of structure design of membrane can also be extended to other dual-layered membranes, including various 2D nanosheet layers combined with different MOF layers.
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