Synthesis of cross-linked amides and esters as thin film composite membrane materials yields permeable and selective material for water vapor/gas separation

2015 ◽  
Vol 3 (15) ◽  
pp. 7888-7899 ◽  
Author(s):  
Sang Hee Yun ◽  
Pravin G. Ingole ◽  
Won Kil Choi ◽  
Jong Hak Kim ◽  
Hyung Keun Lee
Keyword(s):  
Thin Film ◽  
Water Vapor ◽  
Gas Separation ◽  
Composite Membrane ◽  
Selective Layer ◽  
Film Composite ◽  
Membrane Materials ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite

In this work, 3,5-diaminobenzoic acid (BA) was selected to synthesize polyamide as a selective layer because it is considered desirable to fabricate hydrophilic thin film composite (TFC) membranes for water vapor separation.

scholarly journals Thin-film composite membrane breaking the trade-off between conductivity and selectivity for a flow battery

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Qing Dai ◽  
Zhiqiang Liu ◽  
Ling Huang ◽  
Chao Wang ◽  
Yuyue Zhao ◽  
...  
Keyword(s):  
Thin Film ◽  
Power Density ◽  
Composite Membrane ◽  
Ion Selectivity ◽  
Flow Battery ◽  
Selective Layer ◽  
Trade Off ◽  
Film Composite ◽  
Thin Film Composite Membrane ◽  
Thin Film Composite

AbstractA membrane with both high ion conductivity and selectivity is critical to high power density and low-cost flow batteries, which are of great importance for the wide application of renewable energies. The trade-off between ion selectivity and conductivity is a bottleneck of ion conductive membranes. In this paper, a thin-film composite membrane with ultrathin polyamide selective layer is found to break the trade-off between ion selectivity and conductivity, and dramatically improve the power density of a flow battery. As a result, a vanadium flow battery with a thin-film composite membrane achieves energy efficiency higher than 80% at a current density of 260 mA cm−2, which is the highest ever reported to the best of our knowledge. Combining experiments and theoretical calculation, we propose that the high performance is attributed to the proton transfer via Grotthuss mechanism and Vehicle mechanism in sub-1 nm pores of the ultrathin polyamide selective layer.

Sign in / Sign up

Export Citation Format

Share Document