Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 22, Pages 8720-8726Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201915993
Keywords
membranes; ion transport; MXene; nanofluidics; osmotic energy (blue energy)
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Funding
- Natural Science Foundation of China [21861132013, 21536005, 51621001]
- NSFC-DFG [GZ-678]
- China Postdoctoral Science Foundation [2019TQ0101, 2019M662920]
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Membrane-based reverse electrodialysis (RED) is considered as the most promising technique to harvest osmotic energy. However, the traditional membranes are limited by high internal resistance and low efficiency, resulting in undesirable power densities. Herein, we report the combination of oppositely charged Ti3C2Tx MXene membranes (MXMs) with confined 2D nanofluidic channels as high-performance osmotic power generators. The negatively or positively charged 2D MXene nanochannels exhibit typical surface-charge-governed ion transport and show excellent cation or anion selectivity. By mixing the artificial sea water (0.5 m NaCl) and river water (0.01 m NaCl), we obtain a maximum power density of ca. 4.6 Wm(-2), higher than most of the state-of-the-art membrane-based osmotic power generators, and very close to the commercialization benchmark (5 Wm(-2)). Through connecting ten tandem MXM-RED stacks, the output voltage can reach up 1.66 V, which can directly power the electronic devices.
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