Free‐Standing Covalent Organic Framework Membrane for High‐Efficiency Salinity Gradient Energy Conversion

Autor: Jianjun Chen, Liping Wen, Shuhua Hou, Wentao Ji, Yunfei Teng, Lei Jiang
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie International Edition. 60:9925-9930
ISSN: 1521-3773
1433-7851
DOI: 10.1002/anie.202100205
Popis: 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. Here, we fabricate a free-standing covalent organic frameworks membrane (TpPa-SO 3 H) with excellent stability and mechanical properties. This membrane with one-dimensional nanochannels and high charge density demonstrates high ionic conductivity and selectivity. Its power density can reach up to 5.9 W/m 2 by mixing artificial seawater and river water. Based on our results, we propose that the high energy conversion is attributed 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.
Databáze: OpenAIRE
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