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Free‐Standing Covalent Organic Framework Membrane for High‐Efficiency Salinity Gradient Energy Conversion
Author(s) -
Hou Shuhua,
Ji Wentao,
Chen Jianjun,
Teng Yunfei,
Wen Liping,
Jiang Lei
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202100205
Subject(s) - membrane , conductivity , covalent bond , osmotic power , ionic bonding , selectivity , ionic conductivity , salinity , chemistry , chemical engineering , ion , materials science , chemical physics , organic chemistry , reverse osmosis , electrode , electrolyte , ecology , biochemistry , forward osmosis , biology , engineering , catalysis
Both high ionic conductivity and selectivity of a membrane are required for efficient salinity gradient energy conversion. An efficient method to improve energy conversion is to align ionic transport along the membrane thickness to address low ionic conductivity in traditional membranes used for energy harvesting. We fabricated a free‐standing covalent organic framework membrane (TpPa‐SO 3 H) with excellent stability and mechanical properties. This membrane with one‐dimensional nanochannels and high charge density demonstrated high ionic conductivity and selectivity. Its power density reached up to 5.9 W m −2 by mixing artificial seawater and river water. Based on our results, we attribute the high energy conversion to the high ion conductivity through aligned one‐dimensional nanochannels and high ion selectivity via the size of the nanochannel at ≈1 nm in the membrane. This study paves the way for designing covalent organic framework membranes for high salinity gradient energy conversion.