期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 41, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202206152
关键词
Ionic Diode; MXene Membrane; Nanofluidic; Osmotic Energy
资金
- Natural Science Foundation of China (NSFC) [22008077, 22138005, 22141001]
- NSFC-International Cooperation Project [21861132013]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110958]
- China Postdoctoral Science Foundation [2019TQ0101, 2019M662920]
MXene-based asymmetric ionic diode membrane can boost osmotic energy conversion with highly rectified current and tunable surface charge properties. It outperforms state-of-the-art membranes in power density under salinity gradient of synthetic seawater and river water.
Bioinspired asymmetric nanofluidic ion channels with ionic diode behavior that can boost the osmotic energy (so-called blue energy) conversion are highly desirable, especially if they can be easily constructed and modified. Two-dimensional (2D) metal carbides and nitrides, known as MXenes, combine hydrophilic surfaces and tunable surface charge properties, providing a shortcut to prepare asymmetric nanofluidic ion channels. Here, we report a mechanically robust, flexible, and scale-up-friendly asymmetric Ti3C2Tx MXene-based ionic diode membrane with a highly rectified current and demonstrate its potential use in reverse electrodialysis osmotic energy conversion. Under the salinity gradient of synthetic seawater and river water, our ionic diode membrane-based generator's power density is 8.6 W m(-2) and up to 17.8 W m(-2) at a 500-fold salinity gradient, outperforming the state-of-the-art membranes. The design of MXene-based ionic diode-type membrane provides a facile and general strategy in developing large-scale 2D nanofluidics and selective ion transport.
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