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Thin Pore‐Filled Ion Exchange Membranes for High Power Density in Reverse Electrodialysis: Effects of Structure on Resistance, Stability, and Ion Selectivity
Author(s) -
Lee MiSoon,
Kim HanKi,
Kim ChanSoo,
Suh HoYoung,
Nahm KeeSuk,
Choi YoungWoo
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700167
Subject(s) - membrane , electrodialysis , swelling , materials science , porosity , chemical engineering , ion , substrate (aquarium) , ohmic contact , stack (abstract data type) , analytical chemistry (journal) , ion exchange , reversed electrodialysis , transmission electron microscopy , phase (matter) , chemistry , chromatography , nanotechnology , composite material , organic chemistry , biochemistry , oceanography , layer (electronics) , computer science , engineering , programming language , geology
A porous substrate with a microscopic network structure was used to prepare anion and cation exchange membranes. These membrane pairs had a low Ohmic resistance, and their performance in a reverse electrodialysis stack was >1.3 times higher than some commercially available membrane pairs. The low membrane resistance resulted from the membrane's thinness, swelling properties, and locally focused ion conducting phase. The swelling ratio of the prepared membranes was determined by the dimensional changes in the X−Y and X−Y‐Z directions before and after swelling. High‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) analysis was used to confirm the localization of the conducting components. These results were also compared with commercially available membranes.